Sony HDVF-EL30 0.7" FHD OLED Viewfinder with 3.5" Display for 4K/HD Cameras - Manual (Page 72)

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Pin layout (SRG-XB25 only)
VISCA IN terminal (8-pin mini DIN,
female)
VISCA OUT terminal (8-pin mini DIN,
female)
Pin No. Function
1 DTR IN
2 DSR IN
3 TXD IN
4 GND
5 RXD IN
6 GND
7 Not used
8 Not used
Pin No. Function
1 DTR OUT
2 DSR OUT
3 TXD OUT
4 GND
5 RXD OUT
6 GND
7 Not used
8 Not used