[Elecraft] KIO2 and KUSB for K2?

[jerry]

On 2021-08-23 10:22, Paul Huff wrote:
> I am thinking about adding the KIO2 RS-232 serial interface to my K2
> but I don’t know very much about computer hardware.  Would the KUSB
> serial cable that is also sold by Elecraft then be needed to connect
> the KIO2 to the USB port on my Mac computer?  Or is there something
> else that would be needed?

*** Not sure about the KIO2, but I did peruse the data on the serial
port included on the KPA100, which is probably the same.  In the case of 
the KPA100, you MUST use a custom cable - either supplied by Elecraft, 
or made up with their schematic.  This is because Elecraft
used "spare" pins on the serial connector for things that have nothing 
to do with serial communications.

   For serial comm, you connect ONLY pins 2,3 and 5 on the 9-pin serial 
connector.  pin 2 is TxD ( data from the K2 to the computer ), pin 3 is 
RxD ( data from the computer to the K2 ), and pin 5 is the 
common/ground.

   Again, this is specific to the KPA100; I don't know if it applies also 
to the KIO2, but I suspect that it does.

             - Jerry KF6VB