It is a requirement of RS-232 that any interface pin will tolerate a low
impedance short circuit to anything in the range -25V to +25V, so
shorting two outputs together is within specification, even if the
resulting logic level may be indeterminate.
This is only true of compliant interfaces,
David,
That is true the specification says that condition will not cause damage
to compliant drivers and receivers, but if two drivers are placed on an
RS-232 signal line, they will *not* work together and will result in
corrupt data (assuming they are on the TXD or RXD signal lines).
You
There is the formal standard, and there is the defacto standard.
The formal standard says +3v for 1, -3v for 0, and that less than 3v is
undefined.
The common driver chips (1488 and 1489) worked just fine with TTL levels
-- 5v being above +3, and 0v being close enough to -3v.
I've never
-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Lynn
W. Taylor, WB6UUT
Sent: Monday, September 15, 2014 8:15 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
There is the formal standard, and there is the defacto standard
The confusion I am trying to clear is that more than one driver on an
RS-232 line will not work properly and will result in erroneous data.
Multiple receivers are no problem.
Besides, you are quoting the standard for the receiver input. In order
to drive the long lines (as originally
On 9/15/2014 8:42 AM, Dick Dievendorff wrote:
My point is that multiple transmitters on an RS-232 link aren't likely to
work well because the protocol is point to point, and there is no collision
recovery protocol. This isn't an Ethernet cable. It's RS-232. Point to
point, not multipoint.
The RS-232 standard goes quite far and also covers signalling etc.
Have a look here:
http://en.wikipedia.org/wiki/RS-232
P-T / LA7NO
On 15 September 2014 18:11, Lynn W. Taylor, WB6UUT
k...@coldrockshotbrooms.com wrote:
On 9/15/2014 8:42 AM, Dick Dievendorff wrote:
My point is that multiple
I'm not a computer expert so maybe this is a simplistic question.
In the future, wouldn't it be better to abandon serial ports and go to
USB for data communicating between radio/computer/amplifier and other
equipment?
With USB, isn't it possible to write drivers that can work with
multiple
I would not recommend using USB.
It is not very compatible with RF. It can give noise in the receiver, and
it can malfunction if there is RF radiation close to it. Bluetooth is
definitely better for wireless communication.
P-T/LA7NO
On 15 September 2014 20:12, Bill Turner dez...@outlook.com
In the future, wouldn't it be better to abandon serial ports and go to
USB for data communicating between radio/computer/amplifier and other
equipment?
No - you would need multiple ports/hub to connect multiple devices and
each device would need custom drivers for each operating system with
I personally believe RS-232 is better.
It is far more universal
From: Bill Turner dez...@outlook.com
To: elecraft@mailman.qth.net
Sent: Monday, September 15, 2014 2:12 PM
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
I'm
ORIGINAL MESSAGE (may be snipped)
ORIGINAL MESSAGE (may be snipped)
On Mon, 15 Sep 2014 14:38:19 -0400, w4tv wrote:
It
when the amplifier designer insists on polling without providing the
necessary hardware support that problems start.
REPLY:
The designer can do whatever he pleases on a telemetry port -
whether it is of value is debatable.
However, if the designer expects to be able to operate with either a
computer controlled radio or in the absence of computer control of
the radio, he needs to implement two ports - one for the
USB is also a point to point system. But worse, it's master/slave too. At least
with serial both ends are equal; with USB one end must be in charge. That's why
devices can't talk to each other, only to a central system.
If you want multiple connections you need FireWire (or IEEE 1394). All
I doubt that the ACOM (or the Expert) polls the K3. I bet they are
passive
listeners.
73 de Dick, K6KR
Expert can poll K3(as well as almost any other radio) according to its
manual. Sure enough you then need both TXD and RXD connected. Therefore you
can probably use it without computer.
...@subich.com
To: Nick - VE3EYnick.ve...@gmail.com, Dick Dievendorff
d...@elecraft.com
Cc: Elecraftelecraft@mailman.qth.net, ACOM group
acom-l...@yahoogroups.com
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
Message-ID:54147e45.1000...@subich.com
Content-Type
, K6KR
-Original Message-
From: Igor Sokolov [mailto:ua9...@gmail.com]
Sent: Sunday, September 14, 2014 7:32 AM
To: Dick Dievendorff; 'Bill Turner'
Cc: 'Elecraft'
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
I doubt that the ACOM (or the Expert) polls the K3. I bet
. This is
normal.
73, Igor UA9CDC
- Original Message -
From: Bill Turner dez...@outlook.com
To: acom-l...@yahoogroups.com
Cc: Elecraft elecraft@mailman.qth.net
Sent: Saturday, September 13, 2014 5:53 AM
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
My cable is store bought
Bill,
When K3 AUTOINF menu entry is set to NOR, then the frequency is
reported only when polled.
Only the loger polls as the Y cable does not allow the ACOM to do it.
That is why K3 does not report the frequency when the logger is not
running.
The issue can be solved in two ways:
1. Set
ORIGINAL MESSAGE (may be snipped)
On Sat, 13 Sep 2014 12:36:40 +0600, UA9CDC wrote:
I do not have ACOM2000 but I use the same arrangement with Expert 1-KFA and
K3. Logging program polls the radio and the amp only listens for K3
response to learn the operating freq.
...@yahoogroups.com
Cc: Elecraft
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
ORIGINAL MESSAGE (may be snipped)
On Sat, 13 Sep 2014 12:36:40 +0600, UA9CDC wrote:
I do not have ACOM2000 but I use the same arrangement with Expert 1-KFA
and K3. Logging program polls
On Sat,9/13/2014 7:33 AM, Dick Dievendorff wrote:
RS-232 is not a protocol that permits two senders. It's ok to sniff the Rx
line, multiple receivers.
I doubt that the ACOM (or the Expert) polls the K3. I bet they are passive
listeners.
You need frequency messages to be presented to the ACOM
...@yahoogroups.com
Cc: Elecraft
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
ORIGINAL MESSAGE (may be snipped)
On Sat, 13 Sep 2014 12:36:40 +0600, UA9CDC wrote:
I do not have ACOM2000 but I use the same arrangement with Expert 1-KFA
and K3. Logging
] On Behalf Of Bill
Turner
Sent: Saturday, September 13, 2014 7:03 AM
To: acom-l...@yahoogroups.com
Cc: Elecraft
Subject: Re: [Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A
ORIGINAL MESSAGE (may be snipped)
On Sat, 13 Sep 2014 12:36:40 +0600, UA9CDC wrote:
I do
See K3 Config AUTOINF
Regards,
Mike VP8NO
REPLY:
So the K3 does not send data unless polled? OK, now things make more
sense. This explains why, if you're not using the Y connector to your
computer, your data cable must have the TXD wire so the ACOM can poll
the K3.
Is my assumption
My cable is store bought, and it is the kind in figure 7.2, i.e.
without the TXD wire. I ohmed it to be sure. Actually, it is a cable
with a separate Y adaptor, but the effective wiring is the same as
figure 7.2.
And here's the kicker: This morning when I fired up everything to do
some more
ORIGINAL MESSAGE (may be snipped)
On Thu, 11 Sep 2014 17:46:03 -0700, you wrote:
Put the Y cable between the P3 and the computer etc, not on the K3 side. . The
K3 to P3 serial cable should not have any other devices sharing it.
73,
Eric
elecraft.com
REPLY:
Just to be
Nope. The K3's RS232 connector must connect directly to the P3's XCVR
RS232 connector. The Y connector goes between the PC and the P3's PC
connector.
Alan N1AL
On 09/11/2014 06:51 PM, Bill Turner wrote:
ORIGINAL MESSAGE (may be snipped)
On Thu, 11 Sep 2014
ORIGINAL MESSAGE (may be snipped)
On Thu, 11 Sep 2014 19:24:50 -0700, you wrote:
Nope. The K3's RS232 connector must connect directly to the P3's XCVR
RS232 connector. The Y connector goes between the PC and the P3's PC
connector.
Alan N1AL
REPLY:
My mistake. I
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