[Elecraft] K3(s) SteppIR control

[Joe Subich, W4TV]

> Is that connection needed? If it is connected, might it obviate the
> need for a separate CAT program?
If the SteppIR controller is connected in parallel with a computer
the TxD line *must not be* connected as it will load the TxD output
of the computer and *neither* device will be able to poll the
transceiver.

The appropriate schematic would be for the SteppIR "Y" cable:
<https://groups.io/g/steppir/files/Controller%20Cable%20Schematics/Y_cable.pdf>

> Is that connection needed? If it is connected, might it obviate the 
> need for a separate CAT program?
There are some (diode matrix or logic based) devices that will allow
two "controllers" to share a single RS-232 controlled device but they
are not easy to find/build.  An easier device (if your logger can
set DTR high when running) might be a simple relay to switch the TxD
line between computer and SteppIR depending on whether the logger is
running (and polling the transceiver).


73,

    ... Joe, W4TV


On 2020-05-19 9:21 AM, Lou W0FK wrote:
> 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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