GARDASOFT RC1 Series - Trigger Input Options

RC1xx LED Lighting Controllers - User Manual
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7.2.1 Trigger input options
You can connect the following types of trigger to the Smart Input:
3V to 24V voltage source
Any voltage between 0V and 0.9V is
taken as logic 0.
Any voltage between 3V and 24V is
taken as logic 1.
TTL signal
You can connect a TTL signal to the
RC1xx’s input. However, a 3.3V TTL
signal only works if it can drive 8kΩ
without dropping below 2.7V.
If the P ag is set to ‘1’, the RC1xx
output turns on when the TTL driver
goes HIGH. To reverse this, set the P
ag to ‘0’ (see Section 7.2, “Triggering”).
NPN signal
You can connect an NPN open collector
drive to the RC1xx’s input. Use the
connections shown opposite.
If the P ag is set to ‘1’, the RC1xx
output turns on when the driving
transistor turns on. To reverse this,
set the P ag to ‘0’ (see Section 7.2,
“Triggering”).
Opto-coupler
You can connect an opto-coupler as
an NPN drive to the RC1xx’s input. This
prevents a ‘ground-loop’ and reduces
spurious triggering in high-interference
environments.
If the P ag is set to ‘1’, the RC1xx
output turns on when the driving
transistor turns on. To reverse this,
set the P ag to ‘0’ (see Section 7.2,
“Triggering”).