Re: [Elecraft] K2 - KPA100 RS232 interface repair
Great retort, Don. You beat me to saying the same thing. So plug it in with assumptions and you get the stupeed award. If lucky it just sits there and does nothing. Unlucky and you just tested your warrantee (Not Covered). But hooking up ham gear without opening manual is standard operating protocol - it seems. OK well lets hookup the power - uh black to red; red to black - poof! $3K up in smoke! I really dislike the current trend of using the RJ45 as a mic jack. Motorola started using them that way and it ended up being one of worst reliability parts in the system. RJ45 don't take to being physically stressed constantly (at the end of a mic cable). 73, Ed - KL7UW http://www.kl7uw.com Kits made by KL7UW Dubus Mag business: dubus...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
On 8/23/15 11:57 AM, Edward R Cole wrote: I really dislike the current trend of using the RJ45 as a mic jack. Motorola started using them that way and it ended up being one of worst reliability parts in the system. RJ45 don't take to being physically stressed constantly (at the end of a mic cable). I sure agree, Ed. Had to replace a Yaesu FM xcvr mic last year for just that very reason. 73, Phil W7OX __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
On Sat,8/22/2015 10:21 PM, Richard W. Solomon wrote: Not to flog this horse any further, but I direct you to page 85 of the K2 Manual where the DB-9 connector is labeled ...RS-232 and AUX I/O... . Is it RS-232 or not ??? Is it mis-labeled The fact that it says RS-232 AND AUX I/O should be a clue -- a full RS-232 interface requires the use of all 9 pins, leaving nothing for AUX I/O. All of the ham gear I've ever interfaced to uses only two circuits and three pins -- 2 (RXD),3 (TXD), and 5 (Sig Gnd) for control, leaving the other pins and lines for other uses. Pins 4 (DTR) and 7 (RTS) are used by many logging programs to send CW and PTT. There's a piece in QST from 10-15 years ago showing how to build an ICOM interface getting power from either DTR or RTS (I don't recall which). 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Exactly! On 8/23/2015 7:00 AM, Joe Subich, W4TV wrote: On 8/23/2015 1:21 AM, Richard W. Solomon wrote: Not to flog this horse any further, but I direct you to page 85 of the K2 Manual where the DB-9 connector is labeled ...RS-232 and AUX I/O... . Is it RS-232 or not ??? Is it mis-labeled RS-232 defines voltage levels (a bi-polar system greater than +3V or less than -3V). It *does not define a connector*. The K2 Manual is *entirely consistent* in saying RS-232 and Aux I/O ... the CAT pins (2,3 5) are RS-232 levels, the others associated with Aux I/O (ALC, Aux Bus, RF, +12, and 8R) are not. Perhaps the DB connector associated with the KIO2 could be more artfully described as Auxiliary I/O or Auxiliary I/O including RS-232 control but the RS-232 and AUX I/O label is technically accurate. 73, ... Joe, W4TV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to kevin.sto...@mediacombb.net -- R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #3441 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Some of the pins on the AUX I/O connector meet parts of the RS232 spec, but other of the pins are used for an elecraft proprietary expansion interface. So, from an electrical perspective you can say it is actually a mix of both RS232 (partial) and AUX I/O. From a physical connector perspective, it is definitely not RS232, which is why you need to make an isolation/breakout cable. This is explained in the KIO2 manual. The main K2 manual doesn’t really seem to emphasize the point that severe damage can result if you connect this port directly to the serial port on a PC without making up an appropriate isolation/breakout cable. Due to the potentially serious consequences, I would have thought a warning in the main manual would be appropriate. -- 73 de Matt VK2RQ Le 23 août 2015 à 3:22:23 PM, Richard W. Solomon (w1...@earthlink.net) a écrit: Not to flog this horse any further, but I direct you to page 85 of the K2 Manual where the DB-9 connector is labeled ...RS-232 and AUX I/O... . Is it RS-232 or not ??? Is it mis-labeled 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mickey Baker Sent: Saturday, August 22, 2015 9:32 PM To: Bob McGraw - K4TAX Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair RJ45 is commonly used for RS232C. Millions of Cisco routers and switches built over the past 20+ years use this arrangement, as do many other devices. I have a half dozen of these cables - they once were shipped with the router. Although I don't know for sure, I'll bet the pinout is the same as Cisco. I can make up 10 RJ45 connectors in the time it takes to make a soldered DB9. Historically, RS232 was used in electromagnetic applications where there was a need to drive a relay with line levels. Since modern equipment doesn't need this - since TTL became commonplace in the 1970's - and since many lower power devices no longer have 12V power supplies, it has been practice to observe a ONE state at a voltage of 3V+. If you really want some detail, check out the data sheet on your favorite RS232 driver chip. Here's an example: http://cds.linear.com/docs/en/datasheet/11801afb.pdf 73, Mickey N4MB On Aug 22, 2015, at 8:31 PM, Bob McGraw - K4TAX rmcg...@blomand.net wrote: The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. 73 Bob, K4TAX K3S s/n 10,163 On 8/22/2015 7:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I
Re: [Elecraft] K2 - KPA100 RS232 interface repair
On 8/23/2015 1:21 AM, Richard W. Solomon wrote: Not to flog this horse any further, but I direct you to page 85 of the K2 Manual where the DB-9 connector is labeled ...RS-232 and AUX I/O... . Is it RS-232 or not ??? Is it mis-labeled RS-232 defines voltage levels (a bi-polar system greater than +3V or less than -3V). It *does not define a connector*. The K2 Manual is *entirely consistent* in saying RS-232 and Aux I/O ... the CAT pins (2,3 5) are RS-232 levels, the others associated with Aux I/O (ALC, Aux Bus, RF, +12, and 8R) are not. Perhaps the DB connector associated with the KIO2 could be more artfully described as Auxiliary I/O or Auxiliary I/O including RS-232 control but the RS-232 and AUX I/O label is technically accurate. 73, ... Joe, W4TV __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Exactly! On 8/22/2015 7:31 PM, Bob McGraw - K4TAX wrote: The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. 73 Bob, K4TAX K3S s/n 10,163 -- R. Kevin Stover AC0H ARRL FISTS #11993 SKCC #215 NAQCC #3441 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Anyone who has purchased a used K2 needs to take notice, lest it happen to you too. That connector is marked AUX I/O for exactly that reason, it is not a computer RS-232 connector even though it contains TXD, RXD and signal ground. As a result, one must always use the special cable that is built as part of the KPA100 to connect to a computer serial port. You are not likely to have damaged anything in the KPA100 when connecting a standard serial cable to the K2, although KPA100 U6 may have a damaged output at pin 6, and the inductors located just behind the DE-9 connector should be checked for continuity. The TXD and RXD signals in the serial cable will connect to U4 just the same as if the special cable were used. You could have also damaged the computer serial port because pin 1 was grounded by the K2. You will find most of the damage will be in the base K2. Internal signals AUXBUS and VRFDET could have caused the MCU IC to be damaged as well as the KSB2. The fact that the 8R voltage rail appears on that connector, that may have caused further damage. 73, Don W3FPR On 8/22/2015 1:19 PM, K8AC wrote: I had been using an Elecraft USB/serial cable with my recently acquired K2 and the PC communications worked properly. In debugging a software problem, it was suggested that I try using a real serial port, which I did. Unfortunately, I was unaware that I wasn't supposed to use a standard RS232 cable. So now, the K2's port won't work with the USB/serial cable either and I assume that the interface in the KPA-100 was damaged. I guess that U4 (MAX 1406) is a prime suspect for failure in this case. Any suggestions? -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-KPA100-RS232-interface-repair-tp7606571.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w3...@embarqmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. Anyway, maybe you can help me determine what areas to focus on in the repair. Here's what I know: 1. The RF chokes RFC6-9 are all intact. 2. The ALC is functioning properly - the power control properly controls the output 3. U1 in the KPS-100 appears to be functioning as the relays are being activated at the right time as I switch through the bands. 4. Data sent from Hyperterminal through the USB/serial converter to the K2 shows up on Pin 6 of the KPA-100 U4 (the Max1706) and can be seen at pin 26 of the K2 MCU (U6). But, the K2 doesn't act on the commands that are sent. 5. The voltage on pin 5 of U4 (MAX1406) is -15.4 VDC, seems that indicates U4 is toast? I haven't observed any other problems. I found the document written by Gary Surrency and Tom Hammond regarding this situation. Which leads me to some questions: 1. Reference is made to possible damage to the KSB2. Do you know what the symptom would be in that case? 2. Apparently, any damage to the MCU IC might be isolated to just the input from the interface - pin 26. I say that because everything else appears to function normally. Are you aware of anything else I might check for regarding the MCU function? 73, Floyd On 8/22/2015 3:16 PM, Don Wilhelm wrote: Anyone who has purchased a used K2 needs to take notice, lest it happen to you too. That connector is marked AUX I/O for exactly that reason, it is not a computer RS-232 connector even though it contains TXD, RXD and signal ground. As a result, one must always use the special cable that is built as part of the KPA100 to connect to a computer serial port. You are not likely to have damaged anything in the KPA100 when connecting a standard serial cable to the K2, although KPA100 U6 may have a damaged output at pin 6, and the inductors located just behind the DE-9 connector should be checked for continuity. The TXD and RXD signals in the serial cable will connect to U4 just the same as if the special cable were used. You could have also damaged the computer serial port because pin 1 was grounded by the K2. You will find most of the damage will be in the base K2. Internal signals AUXBUS and VRFDET could have caused the MCU IC to be damaged as well as the KSB2. The fact that the 8R voltage rail appears on that connector, that may have caused further damage. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
You say Tomato, I say Tomatoe. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 9:15 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair On Sat,8/22/2015 5:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. I see it quite differently. The K2 was a kit, designed to be built by mere mortals, not machines. The DB-series connectors are widely available from good industrial sources and are easy to work on. There's also the matter of panel real estate. Yes, there are other connectors, but I can't think of a decent alternative that fits the above objectives. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w1...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Hi Jim. Well, when this incident occurred, I was deep into working on an associated software problem and needed to quickly try the PC serial port directly. I agree with you comment about reading the manual and in fact I did so just a couple of weeks back when I acquired this unit. Unfortunately, at my age, I don't always recall 100% of what I read. Now that I have this problem, of course I remember reading all about needing the special cable But, I disagree regarding the use of the DB9 connector on the K2. Having worked on tons of gear with communications ports, I've never run into one that purportedly used an RS232 interface, but would self-destruct if a real RS232 interface were attached. The KPA-100 manual clearly describes it as an RS232 interface and the schematic has it labeled as such. If it doesn't support RS232 voltage levels, then it isn't an RS232 interface in my book. And I know that there are devices that use a DB9 connector but are not RS232 compliant, but that isn't the issue here. In the document that Gary Surrency and Tom Hammond wrote on the subject several years ago, they clearly pointed out the need for a more prominent label warning of the possible consequences of connecting the wrong cable. Had I seen such a warning, I'd have remembered the reason for it and would have avoided the problem. At any rate, the worst result should be a failure to communicate and not the destruction of several important components in the unit. Having read many of your writings, I doubt that you'd have ever designed something with that sort of risk involved. When I get everything working again, I plan to document in detail what fails, how to determine if it had failed and what to do about it. Current documentation on that is rather lacking and I'll bet that there are scores of K2s out there with the same problem. 73, Floyd - K8AC On 8/22/2015 7:26 PM, Jim Brown-10 [via Elecraft] wrote: Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-KPA100-RS232-interface-repair-tp7606571p7606587.html Sent from the Elecraft mailing list archive at Nabble.com. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w1...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
The RJ-45 connector is now defined in the RS-232 standard, as is the DE-9 and DB-25. Of course, Ethernet also uses the RJ-45 connector, as do multi-line telephone sets. Those are *not* interchangeable functions. You would not want to plug an RJ-45 RS-232 cable into your RJ-45 ethernet router jack or into your multi-line telephone system. Make no assumptions about connectors, for they are a just a connector. Another example: The older PCs used the DB-25 for a printer port. How do you tell the difference between a printer port and a 25 pin serial port connector? - you refer to the manual for the device in question and look for a clearly defined label. At our church, there is a sound console that has a DB-25 connector - should I assume that is a printer port, or a serial port just because those are connectors commonly used for those applications - of course not - the connector on the sound console is for expansion devices. So, know what you are plugging into before connecting cables (even if they fit) - if it is labeled as RS-232, then plug away, but if it is labeled with anything different, check the manual before plugging. That fact goes for any device with a connector, it is not just for the K2. As another parallel, RCA jacks are used for many purposes - antenna connections, audio connections, and yes even power connections. Would you plug anything into an RCA jack assuming it was an audio connector without carefully heeding the label or referring to the equipment manual? A connector is just a connector. Just because it looks like the connector in one piece of gear that you happen to be familiar with does not mean it serves the same purpose on everything else. Take DIN connectors as an example - they are common on many pieces of ham gear. Why would one assume that a 6 pin DIN connector on a Yaesu transceiver has the same pinout as that on an Icom. I hope I have made my point and will belabor it no more. 73, Don W3FPR On 8/22/2015 8:31 PM, Bob McGraw - K4TAX wrote: The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. 73 Bob, K4TAX K3S s/n 10,163 On 8/22/2015 7:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w1...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
RJ45 is commonly used for RS232C. Millions of Cisco routers and switches built over the past 20+ years use this arrangement, as do many other devices. I have a half dozen of these cables - they once were shipped with the router. Although I don't know for sure, I'll bet the pinout is the same as Cisco. I can make up 10 RJ45 connectors in the time it takes to make a soldered DB9. Historically, RS232 was used in electromagnetic applications where there was a need to drive a relay with line levels. Since modern equipment doesn't need this - since TTL became commonplace in the 1970's - and since many lower power devices no longer have 12V power supplies, it has been practice to observe a ONE state at a voltage of 3V+. If you really want some detail, check out the data sheet on your favorite RS232 driver chip. Here's an example: http://cds.linear.com/docs/en/datasheet/11801afb.pdf 73, Mickey N4MB On Aug 22, 2015, at 8:31 PM, Bob McGraw - K4TAX rmcg...@blomand.net wrote: The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. 73 Bob, K4TAX K3S s/n 10,163 On 8/22/2015 7:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w1...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to fishflor...@gmail.com __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support
Re: [Elecraft] K2 - KPA100 RS232 interface repair
OK - many thanks, Don. I'll get busy looking at those things. 73, Floyd On 8/22/2015 6:33 PM, Don Wilhelm-4 [via Elecraft] wrote: Floyd, You say the voltage at U4 pin 5 is -15.4 volts, and that *may* be a perfectly valid voltage - that is a MARK. It should not be constantly that way, so check U4 pin 12 - if it is zero, then the MAX1406 is behaving properly in response. That line originates from the MCU (Control Board U6) pin 25, and should be +5v under normal conditions, but pulses to zero when the K2 sends data. If you find KPA100 U4 pin 12 at 5 volts while pin 5 is going negative, then replace U4. OTOH, if U4 pin 12 is at zero volts, suspect the K2 MCU or some problem on the signal line between those points. As a quick check on whether the base K2 or KPA100 is pulling that signal to zero, remove the KPA100 ribbon cable, then power the base K2 and see whether CB U6 pin 25 goes to +5v with the ribbon cable removed. If it stays at 0 volts, remove the MCU and make a resistance measurement on U6 pin 25 to make sure it is not shorted - if you read a high resistance, replace the MCU IC. The most likely symptom if the KSB2 board has been damaged from plugging in a serial cable is that you could have damaged either the KSB2 MCU (AUXBUS line), or Q1 (high voltage on the VRFDET line or the ALC line can do damage). Note that if you were previously connecting the USB to serial adapter directly to the KPA100 AUX I/O connector, it may be possible that no damage would occur *if* the voltage out of the adapter did not exceed 5 volts and never went negative. In the PC world of short RS-232 signalling, some try to get away' with those levels, where a real serial card will typically have voltages in excess of +/-12 volts. So if you did not previously use the special cable, you will need to build one - the instructions are in the KPA100 manual page 60. 73, Don W3FPR On 8/22/2015 4:28 PM, Floyd Sense wrote: Anyway, maybe you can help me determine what areas to focus on in the repair. Here's what I know: 1. The RF chokes RFC6-9 are all intact. 2. The ALC is functioning properly - the power control properly controls the output 3. U1 in the KPS-100 appears to be functioning as the relays are being activated at the right time as I switch through the bands. 4. Data sent from Hyperterminal through the USB/serial converter to the K2 shows up on Pin 6 of the KPA-100 U4 (the Max1706) and can be seen at pin 26 of the K2 MCU (U6). But, the K2 doesn't act on the commands that are sent. 5. The voltage on pin 5 of U4 (MAX1406) is -15.4 VDC, seems that indicates U4 is toast? I haven't observed any other problems. I found the document written by Gary Surrency and Tom Hammond regarding this situation. Which leads me to some questions: 1. Reference is made to possible damage to the KSB2. Do you know what the symptom would be in that case? 2. Apparently, any damage to the MCU IC might be isolated to just the input from the interface - pin 26. I say that because everything else appears to function normally. Are you aware of anything else I might check for regarding the MCU function? 73, Floyd On 8/22/2015 3:16 PM, Don Wilhelm wrote: Anyone who has purchased a used K2 needs to take notice, lest it happen to you too. That connector is marked AUX I/O for exactly that reason, it is not a computer RS-232 connector even though it contains TXD, RXD and signal ground. As a result, one must always use the special cable that is built as part of the KPA100 to connect to a computer serial port. You are not likely to have damaged anything in the KPA100 when connecting a standard serial cable to the K2, although KPA100 U6 may have a damaged output at pin 6, and the inductors located just behind the DE-9 connector should be checked for continuity. The TXD and RXD signals in the serial cable will connect to U4 just the same as if the special cable were used. You could have also damaged the computer serial port because pin 1 was grounded by the K2. You will find most of the damage will be in the base K2. Internal signals AUXBUS and VRFDET could have caused the MCU IC to be damaged as well as the KSB2. The fact that the 8R voltage rail appears on that connector, that may have caused further damage. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] /user/SendEmail.jtp?type=nodenode=7606582i=0 This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] /user/SendEmail.jtp?type=nodenode=7606582i=1 If you reply to this email, your message will be added
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Not to flog this horse any further, but I direct you to page 85 of the K2 Manual where the DB-9 connector is labeled ...RS-232 and AUX I/O... . Is it RS-232 or not ??? Is it mis-labeled 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mickey Baker Sent: Saturday, August 22, 2015 9:32 PM To: Bob McGraw - K4TAX Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair RJ45 is commonly used for RS232C. Millions of Cisco routers and switches built over the past 20+ years use this arrangement, as do many other devices. I have a half dozen of these cables - they once were shipped with the router. Although I don't know for sure, I'll bet the pinout is the same as Cisco. I can make up 10 RJ45 connectors in the time it takes to make a soldered DB9. Historically, RS232 was used in electromagnetic applications where there was a need to drive a relay with line levels. Since modern equipment doesn't need this - since TTL became commonplace in the 1970's - and since many lower power devices no longer have 12V power supplies, it has been practice to observe a ONE state at a voltage of 3V+. If you really want some detail, check out the data sheet on your favorite RS232 driver chip. Here's an example: http://cds.linear.com/docs/en/datasheet/11801afb.pdf 73, Mickey N4MB On Aug 22, 2015, at 8:31 PM, Bob McGraw - K4TAX rmcg...@blomand.net wrote: The K3S has a RJ-45 connector for the RS-232 communications. Now that's different! Of course they supply a cable with a RJ-45 on one end and a DB-9F on the other. And then to keep everybody happy, there is what appears to be a 15 pin VGA connector that is the ACC connector to provide band data and such. The manual clearly states This is not a VGA video connector. Yes it is very important to read and understand the manual before plugging or inserting any connector into any hole on any radio today. It seems most hams think if it plugs in, then it should work. 73 Bob, K4TAX K3S s/n 10,163 On 8/22/2015 7:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to w1...@earthlink.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to rmcg...@blomand.net __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Most of us built our K2/KPA100/KAT100 way back; that was the only way you could buy them, not factory-built nor factory-assembled. That did require that we apply the fine tooth comb approach to the manual, since we soldered every connection to every part. As a result I'm still, 12 years or so after building my KPA100, aware of the issue. 73, Phil W7OX On 8/22/15 5:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. Not everyone goes through manuals with a fine tooth comb to locate the gotchas. 73, Dick, W1KSZ -Original Message- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown Sent: Saturday, August 22, 2015 4:25 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2 - KPA100 RS232 interface repair Hi Floyd, I've owned and operated a pair of K2s, both of which I bought used. Elecraft makes it very clear that the DB9 connector on the K2 is NOT an RS232 interface, that it is not RS232 compliant, and that a standard RS232 cable should NOT be used. Rather, the DB9 connector provides both serial control AND several control functions. The DB9 connector is a generic part, and can be used for many things besides RS232. It is also well known that while the RS232 Standard defines voltage levels, MANY modern products produce far less than those levels. I've owned a lot of gear in my lifetime, and the first thing I do is open the manual, study it, study the wiring of the various connectors, study the specs, and study the operating instructions. 73, Jim K9YC On Sat,8/22/2015 1:28 PM, Floyd Sense wrote: Hi Don. I'm sure you're aware that the RS232 spec includes the description of voltage levels, and if you're going to refer to an interface as RS232 (as Elecraft does in many places) then you're implying that the normal RS232 signal levels will be used. A user shouldn't be required to read a one hundred page manual before plugging in a connector when every other such connector works in the conventional way. Having been a designer using RS232 interfaces 45 years ago, I would have been executed had I designed something like this. __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
On Sat,8/22/2015 5:17 PM, Richard W. Solomon wrote: It seems to me that using a DB-9 connector for non-RS232 uses is taking the Easy way out. There are numerous other connectors that could be used to alleviate any Misunderstanding. I see it quite differently. The K2 was a kit, designed to be built by mere mortals, not machines. The DB-series connectors are widely available from good industrial sources and are easy to work on. There's also the matter of panel real estate. Yes, there are other connectors, but I can't think of a decent alternative that fits the above objectives. 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
On Sat,8/22/2015 9:28 PM, Richard W. Solomon wrote: You say Tomato, I say Tomatoe. My Dad, who was from Ipswich, MA, said tomatoe. :) 73, Jim K9YC __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
Re: [Elecraft] K2 - KPA100 RS232 interface repair
Floyd, You say the voltage at U4 pin 5 is -15.4 volts, and that *may* be a perfectly valid voltage - that is a MARK. It should not be constantly that way, so check U4 pin 12 - if it is zero, then the MAX1406 is behaving properly in response. That line originates from the MCU (Control Board U6) pin 25, and should be +5v under normal conditions, but pulses to zero when the K2 sends data. If you find KPA100 U4 pin 12 at 5 volts while pin 5 is going negative, then replace U4. OTOH, if U4 pin 12 is at zero volts, suspect the K2 MCU or some problem on the signal line between those points. As a quick check on whether the base K2 or KPA100 is pulling that signal to zero, remove the KPA100 ribbon cable, then power the base K2 and see whether CB U6 pin 25 goes to +5v with the ribbon cable removed. If it stays at 0 volts, remove the MCU and make a resistance measurement on U6 pin 25 to make sure it is not shorted - if you read a high resistance, replace the MCU IC. The most likely symptom if the KSB2 board has been damaged from plugging in a serial cable is that you could have damaged either the KSB2 MCU (AUXBUS line), or Q1 (high voltage on the VRFDET line or the ALC line can do damage). Note that if you were previously connecting the USB to serial adapter directly to the KPA100 AUX I/O connector, it may be possible that no damage would occur *if* the voltage out of the adapter did not exceed 5 volts and never went negative. In the PC world of short RS-232 signalling, some try to get away' with those levels, where a real serial card will typically have voltages in excess of +/-12 volts. So if you did not previously use the special cable, you will need to build one - the instructions are in the KPA100 manual page 60. 73, Don W3FPR On 8/22/2015 4:28 PM, Floyd Sense wrote: Anyway, maybe you can help me determine what areas to focus on in the repair. Here's what I know: 1. The RF chokes RFC6-9 are all intact. 2. The ALC is functioning properly - the power control properly controls the output 3. U1 in the KPS-100 appears to be functioning as the relays are being activated at the right time as I switch through the bands. 4. Data sent from Hyperterminal through the USB/serial converter to the K2 shows up on Pin 6 of the KPA-100 U4 (the Max1706) and can be seen at pin 26 of the K2 MCU (U6). But, the K2 doesn't act on the commands that are sent. 5. The voltage on pin 5 of U4 (MAX1406) is -15.4 VDC, seems that indicates U4 is toast? I haven't observed any other problems. I found the document written by Gary Surrency and Tom Hammond regarding this situation. Which leads me to some questions: 1. Reference is made to possible damage to the KSB2. Do you know what the symptom would be in that case? 2. Apparently, any damage to the MCU IC might be isolated to just the input from the interface - pin 26. I say that because everything else appears to function normally. Are you aware of anything else I might check for regarding the MCU function? 73, Floyd On 8/22/2015 3:16 PM, Don Wilhelm wrote: Anyone who has purchased a used K2 needs to take notice, lest it happen to you too. That connector is marked AUX I/O for exactly that reason, it is not a computer RS-232 connector even though it contains TXD, RXD and signal ground. As a result, one must always use the special cable that is built as part of the KPA100 to connect to a computer serial port. You are not likely to have damaged anything in the KPA100 when connecting a standard serial cable to the K2, although KPA100 U6 may have a damaged output at pin 6, and the inductors located just behind the DE-9 connector should be checked for continuity. The TXD and RXD signals in the serial cable will connect to U4 just the same as if the special cable were used. You could have also damaged the computer serial port because pin 1 was grounded by the K2. You will find most of the damage will be in the base K2. Internal signals AUXBUS and VRFDET could have caused the MCU IC to be damaged as well as the KSB2. The fact that the 8R voltage rail appears on that connector, that may have caused further damage. 73, Don W3FPR __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
