[Elecraft] K3, KPA500, StepIRR, Navigator, PC cabling

[James Meade]

The K3 is connected to the Navigator and the KPA500 via the ACC port which  
is a 15 pin D.  KPA500 RS232 port is unused.  This is per the KPA500  
Owners manual.  K3 is connected to PC via the RS232 port.  This leaves no  
place to plug in the SteppIRR, which has 9 pin D plugs.  I'm still  
confused.

Jim NO0B

On Fri, 24 Feb 2012 16:19:06 -0600, Don Wilhelm <w3fpr at embarqmail.com>  
wrote:

> Jim,
>
> Remove the RS-232 cable to the KPA500 - it needs to be on a port that is  
> different (or not connected at the same time) from that used by the K3.   
> The KPA500 port is only used for firmware updates.
>
> In fact, since the KPA500 and the K3 both contain RS-232 drivers, they  
> will get confused and not work properly if connected together.  RS-232  
> is point to point only, no daisy chaining.
>
> Plug the SteppIR cable into the Y that connects to the K3.  The SteppIR  
> has only receivers and just listens on the conversation between the  
> computer Navigator) and the K3 - that is OK since no drivers are  
> involved.
>