Rs-485 Half-Duplex Wiring Example - Campbell SDM-SI01A Product Manual

NOTE:
As with all RS-485 configurations, the use of termination resistors is optional. They tend not
to be required with shorter cable runs and with modern slew-rate-limited driver technology
(as used in the SDM-SIO1A).

6.2.1.3 RS-485 half-duplex wiring example

This shows how to connect a single device, but RS-485 half-duplex networks are the most
common multi-drop configuration. If wiring for multiple devices, make the three wire
connections in parallel, similar to that shown in the full-duplex multi-drop example.
NOTE:
As with all RS-485 configurations, the use of termination resistors is optional. They tend not
to be required with shorter cable runs and with modern slew-rate-limited driver technology
(as used in the SDM-SIO1A).
SDM-SIO1A and SDM-SIO4A Serial Input/Output Modules 15