Wire the RS-485 terminals in a daisy-chain configuration. Use a stranded three-wire twisted and shielded cable as shown in Figure 1. The three different wires are the positive bus, the negative bus, and the COM.
Figure 1. RS-485 wiring
|Terminal on the first device
|Terminal on the daisy-chained device
|Connection to another device on the RS-485 bus
|Cable shield connection. Do not ground the cable shield.
|Connection from another device on the RS-485 bus