[Elecraft] KRC2 rs232 to cpu not working

[Gordon LaPoint]

Jack, (and others on the list)
    Thanks for the pointers.   I was unable to get the rs-232 to the 
computer working.  I have not tried the Aux-bus to the K3 yet.   I think 
I will contact elecraft service and see if I can send it back for a 
look-see by them.  I can not tell what it has for firmware or set the 
bandmap without the rs232.
    I had only the jumpers in for the RS-232 connection, and the serial 
cable is only wired up for rx, tx and gnd (pins 2,3 and 5).  I tried all 
the baud rates, I did verify that the serial port and cable worked with 
my KPA-500 and W2 meter.

Gordon - N1MGO

On 10/22/2015 02:17 PM, Jack Brindle wrote:
> Gordon;
>
> When you get ready to test, send me an email. I will be around this weekend, although I plan on spending some time in CQ WW.
>
> One thing that is very critical. Using a straight-through RS-232 cable will put high voltage (12V) signals on the microcontroller and can
> damage it. I hope that isn’t the situation you are seeing.
>
> The microcontroller reads the W1-8 jumpers only at power-up, so after you change the jumpers you must power cycle the KRC2.
> You can reset the bandpass to factory default by holding the F4 button at power up. This requires the V1.6 firmware, which has
> been out for several years. There should be a sticker on the MCU that indicates the firmware it held when it left the factory, but
> that becomes invalid after the firmware is upgraded. At that point, the only real way to tell the difference is to query the MCU
> with the KRC2 Utility. When you try that utility, the DL/OP switch inside the KRC2 needs to be on the DL position. It should be
> in the OP position for normal use if you are using RS232 to communicate with the radio.
>
> Let me know when you get testing and I’ll help as much as I can. We really do want to get you going with your KRC2 as quickly as possible.
>
> 73,
>
> - Jack Brindle, W6FB
> Elecraft Engineering
>