[Jake E.]

Alright guys...got a problem. I have an older PC (windows 95) that this shop is using for DNC. They want to move the control to a newer PC which is running XP 2002 SP3. I have tried several configuration of the wiring form the 9 pin to the 25 pin to no avail. I just cant get the PC to communicate with the cnc machine ( we are testing on a Mori SL253B ). All parameters are the same (4800 baud, even parity, 7 data bits, 1 stop bit) between the pc and the cnc.

For the wiring I am currently set with the 3 wire setting (9-pin/25-pin) as 3 to 2 ,2 to 3, 5 to 7, and on the cnc side 4 & 5 tied in and 6, 8 & 20 tied in.

I tried direct wiring also to no avail.

Any ideas would be appreciated.

[txcncman]

If all of the settings are correct and the cable used to work with the old computer just fine, then I would suspect the serial port on the newer computer is not working.

[Al_The_Man]

This is where a RS232 breakout box is handy, it has status lights for all lines, including seeing whether data is actually being transmitted.
Al.

[leix_99]

Try in the new computer bios to check the parallel port status, maybe it's disabled or set in a strange direction or who knows, it's a 2 minutes task!

[Al_The_Man]

bios to check the parallel port status, maybe it's disabled or set in a strange direction or who knows, it's a 2 minutes task!

But the OP indicates a Serial (RS232) port?
Al.

[leix_99]

Sure (chair)... Maybe it's set in a unidirectional mode or whatever, me stupid.