PHA5539302-04

RS-485 wiring

Connect the devices on the RS-485 bus in a point-to-point configuration, with the (+) and (-) terminals from one device connected to the corresponding (+) and (-) terminals on the next device.

RS-485 cable

Use a shielded 2 wire or 1 twisted pair RS-485 cable to wire the devices. Use either shielded 2 wire or 1 twisted pair to connect the (+) and (-) terminals.

The total distance for devices connected on an RS-485 bus should not exceed 900 m (2953 ft).

NOTE: You can connect a maximum of 32 devices to a single RS-485 bus.

RS-485 terminals

- Data minus. This transmits/receives the inverting data signals.
+ Data plus. This transmits/receives the non-inverting data signals.
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