9025
« on: April 03, 2012, 03:49:10 PM »
20mA is fine. Just connect direct to the screw terminals on Port 3, there are set out as follows,
1A (Port 3, pin 1 to Mach)
1B (Port 3, pin 2 to Mach)
1Z (Port 3, pin 3 to Mach)
5V
0V(Gnd)
2A+ (Port 3, pin 4 to Mach)
2A-
2B+ (Port 3, pin 5 to Mach)
2B-
2Z+ (Port 3, pin 6 to Mach)
2Z-
The inputs 2A+ etc are differential inputs, that means you can connect differential encoders or MPGs to them however you can use them as single ended inputs also. You would in that case just ignore the 2*- ones and connect to the + ones/
The 1A, 1B and 1Z are single ended inputs
So You have a total of 6 inputs available on Port 3 of the USB SS three of which can be connected differential or single ended.
For your Index pulse I would just use 1A, and take the power from 5V and Gnd, you would then just set the Index in Ports and pins to Port 3 pin 1.
Hood