[TenTec] CAT interfacing to Omni V

[Bob]

I'm having problems interfacing a PC to my Omni V for CAT. The protocols - 
though the manual doesn't say it - are 1200 8 N 1. There seems to be some 
doubt about the connections between the PC COM1 DB9 connector and  the DB25 
connector on the Omni V. Currently they are:

        DB9                     DB25

        pin 2           to      pin 3
        pin 3           to      pin 2
        pin 5           to      pin 7 (earth)

Which is not what the manual says! The 2-2 and 2-3 connections don't work at 
all ie no codes going out from the PC and no acks back.

There is no handshaking. I've seen a diagram (in the Argonaut II manual, of 
all places) with DSR connected to DTR on the DB9 which I've tried, but with 
no success.

So....

1) are the DB9 to DB25 connections correct?
2) do I need handshaking (the CTS pin is currently connected to the PTT line)?
3) I presume it's RS232 levels, or is it TTL (as it is on the Argonaut II)?
4) do I need to set the unque TX/RX identifier? If so, how? There's nothing in 
the manual.

Any help would be much appreciated.

73

Bob Towers
2M0KDZ