Sony DXC-990 Manual page 43

External trigger pulse
The Strobe function is available by inputting the external trigger pulse to the TRIGGER IN (BNC)
connector on the rear panel.
There are two kinds of polarities for external trigger pulse. One is the rising edge and the other is the
falling edge. Both select the same polarity as the input signal for controlling the strobe function.
*In the case of Rising edge
HIGH:4.5~5.0 V
LOW:0~0.5 V
*In the case of Falling edge
HIGH:4.5~5.0 V
LOW:0~0.5 V
10 us ~10 ms
more than 3 V (50 m s)
DXC-990/990P, DXC-390/390P Sales Manual – 41
12. Technical Appendix