ADLINK PCI-8164 - Manual (Page 67)

Signal Connections 55
3.12 Position latch input pin: LTC
The card provides 2 position latch input channels: LTC3 and LTC4,
used by the last 2 axes, 3 and 4. The LTC signal triggers the
counter-value-capturing functions, which provides a precise posi-
tion determination.
The LTC channel is on CN2. The signal names, pin numbers, and
axis numbers are shown below.
The wiring diagram below shows the LTC of the last 2 axes.
CN2 Pin No Signal Name Axis #
89 LTC3 3
95 LTC4 4