[WT-support] LPT pins for SO2R

[Bob Wilson, N6TV]

When pin 5 (or 9) is HIGH, stereo is ON (R1R2).  When it is LOW, stereo is
OFF, and you get R1R1 or R2R2, depending on thestate of pin 4, "headphones
control."

But, this only works with real LPT ports.  USB-to-parallel (LPT) adapters
only work with printers.  They *do not work* for CW keying, PTT, SO2R, etc.
because programs get no direct access to all the required pins.

*Instead, you may** use **USB-to-serial* adapters and control all SO2R
functions with the RTS (pin 7) and DTR (pin 4) serial port pins instead of
using the LPT pins.  But you will need *three serial ports* to control: (1)
CW & PTT, (2) Stereo & RX focus, and (3) Active TX with serial ports, since
the are only two pins per serial port.

The pin function is defined by the COM port settings dialog in Win-Test.

If your laptop has an ExpressCard slot,  you can add a real LPT port
instead of using three USB serial ports.

73,
Bob, N6TV

On Aug 25, 2016 3:13 AM, "HA3LN" <list at ha3ln.hu> wrote:

> Hi,
>
> I've just started to play with the idea to scratch a so2r box using LPT.
> I have USB to LPT converter as the laptop has USB ports only.
>
> Active radio A/B, CW/PTT control is OK.
> Pin 4 takes care of switching between the RX A/B but
> how can I choose for the R1R2 stereo in the same time?
> I see pin 5/9 is responsible for stereo but how this works?
>
> I read through the wiki several times but it's still not clear.
>
>
> Thanks in advance.
>
> 73!
> Csaba  HA3LN
>
> _______________________________________________
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> support at win-test.com
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>
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