Wiring Information for the MCU TTL Trigger Cable - 288-02872 Used on the Laser Tracker

Overview

The Master Control Unit (MCU) TTL Trigger Cable (PN 288-02872) has 4 wires; two white, one orange and one blue. Additionally, there is a bare wire as a shield drain. The purpose of the wires is as follows:

White = ground. Both white wires are connected to the same pin. Either both of these white wires can be connected to the same ground connection on the controlling device or just one of the wires can be used. If only one of the wires is used, the other wire should be covered with electrical tape.

Blue & Orange = signal. Both wires are connected to the same pin. Either both of these wires can be connected to the same voltage signal connection on the controlling device or just one of the wires can be used. If only one of the wires is used, the other wire should be covered with electrical tape. When the voltage signal is 5 Volts, measurements will not be taken. When the voltage signal is dropped to 0 Volts for at least 0.001 seconds, measurements will be taken until the voltage is increased to 5 volts again for at least 0.001 seconds.

Shield Drain = chassis ground. This is the bare silver wire. This wire should be connected to the chassis ground of the triggering device if it has one.

The TTL circuit has an internal 50 Ohm resistor, therefore it will be pulling 0.1 Amps at 5 V.
 

Keywords: ttl, trigger, cable, PN 288-02872, triggering, ttl setup, ttl wiring