That is the way Windows initializes the serial port (the data port
is initialized high). You might look into using Strobe (pin 1)
for PTT to see if it is initialized low or look for one of the old
"set LPT" utilities and run it in an autoexec file at start-up to
reset the LPT data lines (D0-D3 and D4-D7) low.
73,
... Joe, W4TV
On 12/22/2010 9:23 AM, Edwin Karl wrote:
> I probably should have been more detailed in my description.
> I use LPT1 with a laptop/ docking station. It makes for a convenient
> workstation when on the air or contesting. Normally I use the desktop
> for normal logging, etc. It is not connected to the radio in any way.
> I use the serial port to connect to the radio for PSK and other such
> modes through a Rigblaster. There is no space for an additional
> serial card adapter.
>
> Now I use the circuit that K0RC and JA7UDE publish. An NPN
> transistor sinks the voltage from the back of the radio. The transistors
> are tied to the computer thru a 3.3k resistor. On my docking station
> pin 25 does not go to ground, So I use pin 20. Pin 2 for FSK, Pin
> 6 for PTT. (K0RC)
>
> Once the computer wakes up, and I open MMTTY the PTT lifts and the
> radio is now in receive. It sure sounds like a software issue (?).
>
> Thanks for all that replied.
>
> ed K0KL
>
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