Re: Cannot connect to PC

With the cable connected to your PC, and the DB9 end not connected, jump 
pins 2 and 3 (RXD/TXD), then open a terminal program like Hyperterminal, 
select the com port, and when you type something you should see it back 
on the screen with echo off, and see double with echo on.  If not, 
you've gor the wrong com port, or the cable/driver is NFG.

If that works, connect a scope (or maybe even a voltmeter) to pin 2 
(VR5K RXD) and pin 5 (ground) and send some stuff through Hyperterminal 
and the lowest baud rate you can.  You should see some sort of signal 
there.

If it's not on pin 2 check pin3.

If it's on pin 3 you need a crossover or null modem adapter.

Dave


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