B&B Product Compatibility with Industrial Buss
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The model 485OP is compatible with Modbus, with the following restrictions:

1. The 485OP must be connected to the Modbus port 2
2. Modbus port 2 must be configured as an RS-485 port.
   (the default protocol for Modbus port 2 is RS-232)

The model 485OP will work with 2 and 4 wire systems.

Pin Function 1 RXD- 2 RXD+ 3 TXD+ 4   5 Signal common 6 TXD- 7   8 Shield	Pin Function 1 TXD+ 2 RXD+ 3 Signal common 4   5   6 TXD- 7 RXD-

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Master Communication Cable	Interconnect Cables