ADLINK PCI-8124-C - Manual (Page 29)

Signal Connections 19
3.3 Isolated Encoder Differential Input
There are 4 pairs of A-B-Z encoder signal inputs on PCI-8124-C.
The pin assignment of these encoder inputs are listed in the fol-
lowing table.
The typical forward voltage of the input diode is 1.65V. And the
forward current of the input diode is 7.5mA to 12.5mA. There is an
internal resistor in the PCI-8124-C circuit as figure shows below.
So if there is no additional resistor connected outside the PCI-
8124-C, the voltage difference between Encoder+ and Encoder-
should be lower than 5VDC.
Note: n=1, 2, 3, 4
CN1 Pin No. Name Description
9, 15, 34, 40 EAn+ Isolated Encoder A +
10, 16, 35, 41 EAn- Isolated Encoder A -
11, 17, 36, 42 EBn+ Isolated Encoder B +
12, 18, 37, 43 EBn- Isolated Encoder B -
13, 19, 38, 44 EZn+ Isolated Encoder Z +
14, 20, 39, 45 EZn- Isolated Encoder Z -