Hitachi HV-F31F - Manual (Page 54)

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2. DC IN/SYNC input and output (DC IN/SYNC connector)
1) External HD/VD signal input
HD/VD: 2 to 5 Vp-p, Negative
2) External trigger signal input (Photo-coupler)
low 0 Vdc, high 24 Vdc
3) Flash signal output
low 0 Vdc, high 5 Vdc
4) Power supply input
12 V rated
(Stable operation at 10.5 to 15 VDC (ripple and noise absent))
3. External trigger input (TRIG IN connector)
low 0 Vdc, high 2 to 5Vdc
TRIG (H)
TRIG (C)
2.5K ohm
Photo-coupler input part