Re: [Elecraft] K2/100 RS232 trouble

2021-09-16 Thread Geert Jan de Groot 

The problem of using a standard cable with the serial port is not that
it might fail to operate as a serial port, but rather than it might
permanently destroy the (non-RS232) internal signalling within the
transceiver.

...

In fact there seem to be two pins that are used for signals that cannot
tolerate RS232 voltages.


The K2 "A to B mod" has some modifications that at least seem to reduce 
some of the damage. I don't remember it being announced as such, but 
reviewing the mod status of my K2 after some time found some snippets I 
had not seen before.
Things still would not work and I am not sure the K2 is fully protected 
but some protection is added and the damage should be less.


If you still did make the boo-boo, this link from LA3ZA may be useful:
http://folk.uio.no/sverre/LA3ZA/blog/K2/N0SS/k2_wrong_ser_cbl_damage.pdf

Geert Jan
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Re: [Elecraft] K2/100 RS232 trouble

2021-09-13 Thread David Woolley 
The problem of using a standard cable with the serial port is not that 
it might fail to operate as a serial port, but rather than it might 
permanently destroy the (non-RS232) internal signalling within the 
transceiver.


If that signalling is destroyed, the set won't be able to do anything 
useful, so won't be able to operate the serial port.


In fact there seem to be two pins that are used for signals that cannot 
tolerate RS232 voltages.


This is only a may, because it depends on which wires in the cable are 
actually connected at the other end.  The special cable basically leaves 
some pins unconnected.


--
David Woolley
Owner K2 06123
On 10/09/2021 13:12, Andy McMullin wrote:

You are using the special RS232 cable aren’t you? You must connect with a cable 
matching the special pinout first. If you try a straight connection it will 
fail.



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Re: [Elecraft] K2/100 RS232 trouble

2021-09-10 Thread bo.andersson 
Sorry guys, suddenly everything works fine again, just like that 

 

Best 73 de SM6FPG / Bo

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[Elecraft] K2/100 RS232 trouble

2021-09-10 Thread bo.andersson 
Can you see any signal on AUXBUS on U2 pin 12 from control board on K2?

A friend tested with an oscilloscope on U2 pin 12 but there was no signal if
I changed the frequency on vfo

 

/SM6FPG Bo

 

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[Elecraft] K2/100 RS232 trouble

2021-09-10 Thread bo.andersson 
Yes I use the special K2 cable

 

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Re: [Elecraft] K2/100 RS232 trouble

2021-09-10 Thread David Pratt 


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Re: [Elecraft] K2/100 RS232 trouble

2021-09-10 Thread Andy McMullin via Elecraft 
Bo,

You are using the special RS232 cable aren’t you? You must connect with a cable 
matching the special pinout first. If you try a straight connection it will 
fail.

Try the K2 and its cable into an interface unit such as the Modular Technology 
interfaker (like https://www.ebay.co.uk/itm/224519972647 
) or something smaller such as 
https://cpc.farnell.com/pro-signal/t-mb460p/rs232-check-tester/dp/CS11237?ost=pro+signal+t-mb460
 

 

Check you have enabled the necessary handshake pins, and are receiving the same 
from the USB interface.

Hope this helps
Andy


> On 10 Sep 2021, at 12:38,   
> wrote:
> 
> 
> 
> Hi
> 
> 
> 
> RS232 does not work to K2 / 100 via usb.
> 
> Have tested various rs232 / usb adapters, also brand new.
> 
> The correct values ​​are entered in the computer for the port.
> 
> All measured values ​​of U4 MAX1406 are according to Table 4 IC DC voltage 
> chart.
> 
> Has also changed U4 to a new one.
> 
> Is it the control board on K2 that is faulty?
> 
> How do I investigate this? 
> 
> SM6FPG/Bo
> 
> 
> 
> 
> 
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[Elecraft] .[K2/100] RS232 trouble

2021-09-10 Thread bo.andersson 
Hi

RS232 does not work to K2 / 100 via usb.

Have tested various rs232 / usb adapters, also brand new.

The correct values ​​are entered in the computer for the port.

All measured values ​​of U4 MAX1406 are according to Table 4 IC DC voltage 
chart.

Has also changed U4 to a new one.

Is it the control board on K2 that is faulty?

How do I investigate this? 

SM6FPG/Bo

 

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[Elecraft] K2/100 RS232 trouble

2021-09-10 Thread bo.andersson 
 

Hi

 

RS232 does not work to K2 / 100 via usb.

Have tested various rs232 / usb adapters, also brand new.

The correct values ​​are entered in the computer for the port.

All measured values ​​of U4 MAX1406 are according to Table 4 IC DC voltage 
chart.

Has also changed U4 to a new one.

Is it the control board on K2 that is faulty?

How do I investigate this? 

SM6FPG/Bo

 





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