Hello

PTT32
=====
PTT32 will do PTT under also under Windows 2000 and Windows XP.

You may use PTT32 together with WSJT to do PTT on the LPT port or
together with MSDSP to PTT under Windows 2000 or XP.

PTT32 supports LPT1-3 and COM1-8 ports.

Interfaces
==========
Port pins
---------
COM
-  9 pin: GND = 5, PTT = RTS = 7. 
- 25 pin: GND = 7, PTT = RTS = 4.
LPT
- 25 pin: GND = Strobe = 1, PTT = Initialize = 16

Hardware
--------
Galvanic isolated interface:
PTT  <--[4k7]--+
               |     ----> PTT line
               --  |/ C
               \/  |
               --  |\ E
               |    |
GND  <---------+    = Radio ground

Direct interface:
                   ----> PTT line
                 |/ C
PTT <--[4k7]-----|
                 |\ E
                  |
GND <-------------+----> GND

73
Bo, OZ2M, www.rudius.net/oz2m