[Elecraft] KAT500 and KPA500 integration

[Don Wilhelm]

Andy and all,

Perhaps the confusion is coming from the similarity of names.
The "AUXBUS" is a proprietary single wire communicaions interface that 
is used for communications between various units in the Elecraft gear - 
if for no other reason than to test for the presence of a particular device.

The fact that the cable between the K3 and the KAT500/KPA500 is called 
the "AUX cable" - it is NOT the AUXBUS even though one of the wires is 
for the AUXBUS.

That is quite different and separate from any RS-232 communications. 
There are no RS-232 signals in the AUX cable.

73,
Don W3FPR

On 6/21/2018 1:25 PM, ANDY DURBIN wrote:
> It's clear that both the KPA500 and KAT500 must be RS-232 transmitters as well as RS-232 receivers. If that were not true then the PC utilities could not function. My station data logger has been polling, and receiving responses from, my KPA500 since I first built it.
> 
> 
> Now I know that the KAT500 will receive and process the Kenwood command set I think I can see how to implement a band control interface and still be able to receive KPA500 and KAT500 status with my logger.
> 
> 
> What is still not clear to me is how the KAT500 uses the single line AUX bus. The KAT500 schematic shows the AUX bus is received as "AUXB" and not just passed from input connector to output connector.
>