Canon C50i Instruction Manual - Page 17

ENGLISH Before You Use the Product Item External lighting control signal Alarm control signal External sensor input Pin No. A8 B8 A9 B9 A10 B10 Pin name Light_ON/OFFLight_ON/OFF+ Alarm_Alarm_+ Sensor_Sensor_+ Input/ Output Output Output Output Output Input Input Signal direction Notes Current input External lighting switch 50V/200mA (max.) Current output Current input External lighting switch 50V/200mA (max.) Alarm control 50V/ 200mA (max.) Current output Alarm control 50V/ 200mA (max.) Current input GND Current output Pull-up to 5V, diode protected External Device I/O Terminals External device input terminals These comprise 2 sensor terminals (positive (+) and negative (-)). The negative terminal is connected to the camera's own internal ground and the positive terminal is pulled up to 5 volts at 10 kohm via a protection diode. Connecting the respective leads to the positive and negative terminals and then shorting across the terminals (ON) or not (OFF) generates an interrupt for the internal controller. The power supplies and grounds for connected sensors and switches should be connected to electrically segregated terminals. When an ON state is detected, an event occurrence is posted to the host PC. External device output terminals These comprise ON and OFF terminals for the alarm and light terminals, with equivalent terminals in both directions for the respective combinations. The two terminals can be switched between conductive and resistive states using the internal controller. In addition, an optical connector is used in the output terminal and is separate from the internal circuits in the camera. The load connected to the output terminal should be within the following ratings: Rated values between output terminals Max. DC voltage: 50V Continuous load current: 120 mA Item Pin No. Pin name Signal direction Notes 17