varlogic modbus communication user manual - Schneider Electric

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NRC12Modbus applicationUSER’S MANUAL2 4 6 8 10 121 3 5 7 9 11Picture 10: Jumpers on MCUModbus PFC JumpersRS-485 2-wire FiberRS-485 2-wireRS-232RS-485 4-wireFiberRS-485 4-wireRS-232Table 6: Jumpers on MCU12
NRC12Modbus applicationUSER’S MANUAL6.1.5 Terminators and biasing on an RS-485 busTerminatorBiasingNo terminator,No biasingTerminator2-wire4-wireDIP-switchOn OffMCU MCU MCU MCUPicture 11: Terminators and biasing in RS-485 busSet the DIP switches according the picture above in MCU to connectterminators and biasing voltages to an RS-485 bus. Terminators areconnected to both ends of the bus. Bias voltages are fed from only onedevice in the bus. When a 2-wire bus is used, terminators and biasing isneeded only for the used pair.Switch Signal EffectDIP1 TxD TerminatorDIP2 TxD0 - Bias voltageDIP3 TxD1 + Bias voltageDIP4 RxD0 - Bias voltageDIP5 RxD TerminatorDIP6 RxD1 + Bias voltageTable 7: Terminators and biasing on an RS-485 busThe termination of the line is done by a 120 ohm resistor. For biasing, two620 ohm resistors are used.13
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varlogic modbus communication user manual - Schneider Electric

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