[Elecraft] [KX3] RS232 xcvr control when serial ports are occupied

[Bill Frantz]

The AUTOINF (Tech mode) switch can have the K3(S) automatically 
send frequency data on the RS-232 interface. The manual warns 
that turning this on may not be compatible with all PC software, 
but everything I run seems happy with it being on. With this on, 
you don't need to have a program polling for this information.

73 Bill AE6JV

On 7/15/18 at 2:00 AM, elecraft at mailman.qth.net (Stephen Rector 
via Elecraft) wrote:

>With this configuration, the Antenna controller has its TXD pin 
>left unconnected. As many here noted, this is of necessity 
>since only one TXD driver can exist on a common TXD line. So, 
>for the controller to work, FLRig must be running and connected 
>to the radio. Since FLRig polls the KX3 control parameters, the 
>Antenna controller receives the VFO data it needs on its RXD 
>line. Apparently it doesn't matter that the controller is not 
>doing the polling, as long as something else is.

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