[Elecraft] K3(s) SteppIR control

[Lou W0FK]

The "official" SteppIR cable schematic also shows that Pin 3 (TXD out on the
K3S's RD232 DE9) is also to be connected. 

https://groups.io/g/steppir/files/Controller%20Cable%20Schematics/S-26_21-6026-01%20Cable,%209%20pin%20FM%20to%20Male%202%203%205.pdf

Is that connection needed? If it is connected, might it obviate the need for
a separate CAT program?

73, Lou, W0FK


ANDY DURBIN wrote
> "The Y cable is connected to the SDA 100 Data IN, radio port, points 2
> (RXD) and 5 (ground)"
> 
> You also need to link 7 and 9 on the SDA 100 connector.  Pin assignments
> on the SDA 100 connector are not typical RS-232.
> 
> "PINOUT of 9 pin SUBD DATA IN CONNECTOR
> 1. Data out RXD
> 2. RXD to RS232 Radio TXD
> 3. TXD to Radio RXD
> 4. TTL Kenwood and active high for Radio CTS
> 5. Signal Ground
> 6.
> 7. TTL version of pin 2
> 8. NC
> 9. TTL RXD for Steppir."
> 
> Andy, k3wyc





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