Your port on the CNC maybe damaged, since you did say the RS232 hardware was fired. So maybe buy the RS232 tester, place at end of the cable, and confirm you see RD (receive data)being sent to the end of the cable. This confirms your PC comm port sends, via the cable, to the CNC. Once it hits your CNC, you then have to look at the board in the CNC - calling Haas Tech to fix it.

Keep in mind, if older Haas, there are two ports, DB25 on the machine. Plug into the top one.

Good Luck!

Greg Mercurio
Shop Floor Automations
www.shopfloorautomations.com