I have been using my table without e-stop or limits since I built it a few month ago. Now that I have ironed out any kinks I have begun to complete the machine. The axis outputs work great however I cannot get the inputs to work.
My driver board has a DB9 connector for the four input triggers. These inputs are sent via opto isolators to pins 10-13 on the db25 connector. I have verified the operation of the limit switches with a meter. With the PC powered up and with the switches open I read 5 volts on pins 10-13 (with respect to pin 25 ground). With the switches closed I read close to zero on the same pins. Mach 3 however does not seem to recognize that there are inputs connected. I am watching the indicators on the diagnostics page. I have enabled the home/limit inputs via "Ports and Pins". Is there something else that I am missing here?
Your help is greatly appreciated.