External Triggering; Trigger In; Trigger In Latency - THORLABS KBD101 User Manual

Chapter 4

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 Kinesis
software (see Section 6.3.5.) 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

SMA
Connector
The TRIG Input contains a pull up resistor to an internal +5V 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.
28
5V
10K
10K
Fig. 4.3 TRIG IN Connection Detail
Protection
0V
HA0364T Rev Ck Jan 2017
TTL Buffer