Modbus 485 Bus Wiring Methods

Modbus 485 Bus Wiring Methods

Connection Method 1: Not recommended, interference leads to continuous bugs.

Modbus 485 Bus Wiring Methods

Solution 2: Connect the passive termination resistor as shown in the figure: recommended.

Modbus 485 Bus Wiring Methods

Connection Method 3: Connect 5V active termination resistor:

Modbus 485 Bus Wiring Methods

Incorrect Connection Method:

Modbus 485 Bus Wiring Methods

Error 1: The bus must be connected in a linear fashion, not in a star configuration.

Error 2: Missing termination resistors.

Modbus 485 Bus Wiring Methods

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