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GE680 Technical Manual
Page 29
Mini-SMB Trigger Schematic
OUT
RG-174 COAX CABLE
TRIGGER INPUT
IN
USERS TRIGGER CIRCUIT
MINI-SMB
MINI-SMB
SY NC OUT 1
RG-174 COAX CABLE
USER TRIGGER (5V TTL DRIVER)
SY NC OUT 1 (5V TTL RECEIVER)
The trigger circuit is connected to a Texas Instruments SN74ACT244PWR buffer/driver inside the camera. The required trigger input current is
less than 10uA and the maximum sync output current is 24mA. See the Texas Instruments SN74ACT244PWR for more detailed information.
Note that the trigger input signal is not terminated to match the cable impedance.