[Elecraft] KRC2 relay control

Sun Jul 5 16:03:52 EDT 2015

A bit more on this. Sending MN049; to the K3 puts the K3 into the Menu mode with the KRC2 item selected. The VFOA display will show the status of the KRC2 ACC pins, read directly from the KRC2. You can then issue UP; or DN; commands to change the KRC2 ACx pin setting. It will advance (or decrement) by one for each UP (or DN) issued, rolling over when it gets to the end of the sequence. You can read the LCD with the DS; command to tell what the AC state is. Issuing MN255; will get you back to normal operations.

Be sure to refer to the K3S/K3/KX3 Programmer’s Reference to get the details as to how to issues these commands, they can be a bit convoluted, especially when playing in the menus.

If you are adding the commands to N1MM, you probably want to use 2, the first to turn on ACC1: MN049;UP;MN255;
the second to turn it off: MN049:DN;MN255;

This can be a lot more involved if you use the AC2 or AC3 pins as well, and using the KRC2 with AC binary coding (jumper W4 installed) makes things far more complex.

Note that external control of the ACx pins requires use of the AUX I/O connection to the K3/K3S. The KRC2 does not have any commands to change the ACx pins using the serial port, nor does the transceiver have the ability to make that request using the serial port instead of Aux I/O.

- Jack Brindle, W6FB

> On Jul 5, 2015, at 10:47 AM, Jack Brindle <jackbrindle at me.com> wrote:
> 
> Byron is on the right track here. The best way to control the KRC2’s ACx pins is to do it through the K3’s menu. The KRC2 is listening to the K3 to get band and status information, and not necessarily to a computer. So setting the state in the K3 will cause it to be changed in the KRC2.
> 
> Take a good look at the K3’s MN command, specifically MN049. I suspect that testing with the K3 Utility’s command pane will quickly show you the correct command to do what you want. From there is is a pretty simple matter to plug the command into N1MM+.
> 
> By the way, the K3S/K3//KX3 Programmer’s Reference has been seeing a lot of update activity recently. If you haven’t downloaded the latest, you may be missing out on some interesting stuff. 
> 
> Jack Brindle, W6FB
> 
> 
> 
>> On Jul 4, 2015, at 11:57 AM, Byron Servies <byron at n6nul.org> wrote:
>> 
>> Hi,
>> 
>> See the KRC2 manual and search for AC1.  On Page 15 of the rev.C
>> manual, the KRC2 test procedure includes using F4 for accessory
>> drivers, and page 19 has the default behavior of F4.
>> 
>> I am not in front of my ham pc right now, but I believe there is a way
>> to trigger those from the utility. Perhaps someone else knows if there
>> is a command in the K2 programmers manual for triggering these
>> outputs.
>> 
>> 73, Byron N6NUL
>> 
>> On Sat, Jul 4, 2015 at 10:24 AM, Rich <rwnewbould at comcast.net <mailto:rwnewbould at comcast.net>> wrote:
>>> I have research this idea on my own and do not see a way to do what I want.
>>> I know there are really smart folks on this list so I am looking for some
>>> help.
>>> 
>>> I was hoping to control the 12vdc (ON/OFF) for my RX ant preamp via the K3
>>> keyboard commands (Writelog, N1MM).  I was thinking this could possibly be
>>> done via the sink/source relays in the KRC2.   I already use the KRC2 for
>>> band decoding,  but it appears to me that the relays only react to band
>>> changes.  Are there  computer controllable commands for the A B C D relays
>>> in the KRC2 or any other ideas?
>>> 
>>> I hope this is clearer than mud.
>>> 
>>> Rich
>>> K3RWN
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>> 
>> 
>> 
>> -- 
>> - Northern California Contest Club
>> - CU in the Cal QSO Party 3-4 Oct 2015
>> - www.cqp.org <http://www.cqp.org/>
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