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Brushless DC Servo Driver K-Cube
4.5 External Triggering
External triggering is facilitated by the ‘TRIG 1’ and ‘TRIG 2 connectors on the front
panel of the unit - see Section 3.3.2.. These connectors are controlled via the APT
software (see Section 6.3.4.) and provide a 5V logic level input/output that can be
configured to support triggering from and to external devices.
4.5.1 Trigger In
Fig. 4.3 TRIG IN Connection Detail
The TRIG Input contains a pull up resistor to an in5V supply, allowing it to be
operated by passive devices (e.g. a switch or relay contact) as well as standard logic
outputs. The protection circuit also allows the external signal to be in the ±10 V
voltage range.
The input logic threshold levels are compatible with most TTL and CMOS logic circuits
(input <0.8V is low and >2.4 V is high). Do not exceed the maximum voltage range of
-10V to 10V.
4.5.2 Trigger In Latency
The trigger input will not accept another trigger request until the current move has
completed, which imposes a restriction on how frequently moves can be triggered. In
addition, there is a communications latency between the microcontroller and the
motion processor of up to 100 msec. This means that the maximum frequency at
which triggered moves can be commanded is approximately 100 msec plus the
duration of the move itself.
2
10K
10K
0V
5V
SMA
Connector
Protection
TTL Buffer
