Photometrics SenSys, User Manual, Page: 39 / 48

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SenSys User Manual
inputs are internally pulled up, therefore it is recommended to drive them
with an open collector driver.)
7 TRIGGER INHIBIT INPUT
This input inhibits all trigger signals. If the input is pulled low, trigger
activity is disabled. By default, the input is pulled high so the trigger
circuitry is enabled. (The inputs are internally pulled up, therefore it is
recommended to drive them with an open collector driver.)
8 TRIGGER INVERT INPUT
Active low. A low on this input inverts the state of FILTERED TRIGGER
INPUT (6), causing a high level to cause a trigger. (The inputs are
internally pulled up, therefore it is recommended to drive them with an
open collector driver.)
9 GROUND
System digital ground. Any external circuitry intended to interface with
the trigger control signals must reference this ground connection.