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Termination resistor: built in, selectable by a switch. 120 ohms resistor is needed
at both end of the line and must be switched or not depending on the location in
the Modbus network topology.
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Transient voltage suppressors
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Screwed terminals on the RS485 side
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TX – RX Led indication for easy debugging and troubleshooting
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Slew-Rate Limited for Error-Free Data Transmission (minimizing EMI and
reducing reflections caused by improperly terminated cables)
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Drivers are short-circuit current limited
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The receiver input has a fail-safe feature in case of broken connection
Compatible Devices: Any Modbus device capable of Modbus communication as a
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master.
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Speed reply time: better than 5 ms @ 57600 bauds
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Max data packet: Any complete table provided in the Modbus data table
4.5 Commissioning process
To install the RS485 Modbus adapter, follow the hereafter commissioning process.
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Disconnect power supply from the controller
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Wait the required time to ensure all capacitors are discharged
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Connect the signal ground (if present) to GND
Connect the twisted pair to the A and B connections
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Insert the RS485 Modbus adapter in the controller
Fix it with the appropriate screw
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Ensure that all connections are tight.
RS485 ç RS485 Modbus adapter 11
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