4 Connectivity 4.2 [J25] 4-Pin RS-485 Connector (3.81mm) Pin # In/Out Name Description Interface 1 O +5V +5V PDEO 2 I/O 485+ RS-485 plus signal 3 I/O 485- RS-485 minus signal 4 O GND Ground On Shore Technology Inc Mating Connector – EDZ1550/4 Table 4.1