Figure 1. COM2 and COM1 connectors in the display. To create a 2‑wire RS‑485 connection to a sensor, use the COM2 or COM1 R− and R+ connectors. For the wiring diagram and jumper settings, see Connecting cables and grounding. 1 COM2 R− connector 2 COM2 R+ connector 3 COM1 R− connector 4 COM1 R+ connector
