[Elecraft] KRC2 rs232 to cpu not working

[Jim Brown]

On Thu,10/22/2015 5:20 PM, Bob wrote:
> That may not be necessary.   I'm working from memory which is a 
> horrible thing to try and use but if I recall correctly each of the 9 
> pin connectors have jumpers on each pin. 

It is important to understand that the DB9 connectors on the KRC2 ARE 
NOT for an RS232 connection, and, in general, will NOT WORK with 
standard RS232 cables. It's wiring is VERY different, because the 
product was originally designed to work with the K2 remote control, 
which is also very different from RS232. Wiring is shown in the manual 
(Fig 6).

On the DB9 connectors, ONLY pins 2, 3, and 5 are used for serial 
control, and are wired to corresponding pins on a computer serial port.

I used to have two KRC2s in my station controlling sets of W3NQN 
bandpass filters with the Array Solutions switchbox. I don't remember 
details of the hookup, but the manual clearly shows how the KRC2 can be 
configured for a variety of uses.

One very useful piece of information is that band data from the K2 and 
K3 to the KRC2 is contained in the single AUX Bus circuit, which I 
implemented with a coax cable between my K3 15-pin AUX connector and the 
KRC2. That bus is Pin 6 on the DB9 connectors.

73, Jim K9YC