Cooper & Hunter Modbus Mini - Modbus Bus Repeater and Length Guidelines

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Modbus Gateway(Mini)

Step 2: Please refer to Chapter 5.3.3 and conduct matched resistance setting for

Modbus Gateway(Mini).

Note:

In Modbus bus, if the connected Modbus Gateway(Mini) exceeds 30 or

communication distance exceeds 800m, one photoelectric isolation repeater shall be

added. Connect the R+ and R- port of photoelectric isolation repeater with the R+ and

R- port of RS485 communication port of nearby Modbus Gateway(Mini).