MICRO-EPSILON scanCONTROL 29 0 Series Assembly Instructions Manual page 5

RS422, Synchronization
The RS422 connection (Pin 11 and 12 of the multifunction port) can be used in either of
the following configurations:
- RS422 (half-duplex): Load user modes and sensor control, sensor control and
transmission of measurement results (Modbus RTU or ASCII format)
- Synchronization/triggering: Synchronization or triggering using switching signals
Trigger, Encoder, Mode Switching
The switching inputs of the multifunction port can either be used for encoder input,
trigger input or for load previously stored user modes.
The signal levels are switchable for all switching inputs between LLL (low voltage, TTL
logic) and HLL (high voltage, HTL logic):
- LLL level: Low 0 V ... 0,8 V, high 2.4 V ... 5 V, internal pull-up 10 kΩ connected to
5 V
- HLL level: Low 0 V ... 3 V, high 11 V ... 24 V (permitted to 30 V), internal pull-up
10 kΩ connected to 24 V
- Pulse duration: ≥ 5 µs
External Laser Switch-off, Optional
The external laser switch-off is implemented as a hardware solution and has a top prior-
ity. The laser can be switched off, in addition, also by software.
This function is offered by sensors with the /BL-SI option.
Use a serial key switch in the control circuit to switch off the laser.
With standard sensors, connecting the supply voltage activates the laser light source in
the sensor.
Wiring details are available in the operating instructions, Chap. 5.2.6.
scanCONTROL 2900/2950BL Page 5