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What is the maximum cable length for a Modbus RTU network?

Modbus RTU – how to interconnect Sentera devices

We recommend that the total cable length per segment does not exceed 1.000 m. (Total cable length = sum of the main network line and all branches).

Modbus RTU should follow a line topology, so avoid making branches on the main line. If branches are present, they should be kept as short as possible. The combined length of all branches should not exceed 20 m.

When the total cable length becomes too high, the Modbus RTU communication will be disturbed. To compensate these communication losses due to cable length, a Modbus repeater (e.g. DPOM-24-20) can be used to compensate cable length.