Habey BIS-6650 - Manual (Page 14)

2.4.4 LVDS Rated Voltage Select Jumper（J8）
Before using the LVDS, please first check the rated operating voltage.
COM2 RS232（default） COM2 RS485
J1 1-3 2-4 J1 3-5 4-6
J2 1-2 J2 3-4 5-6
8