A-ISOMETER® IRDH375 IRDH375B - Bender
A-ISOMETER® IRDH375 IRDH375B - Bender
A-ISOMETER® IRDH375 IRDH375B - Bender
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Serial interfaces6.2 RS485 interface with BMS protocol (<strong>IRDH375</strong>B)The RS485 interface galvanically isolated from the device electronics and currentoutput serves as a physical transmission medium for the BMS protocol.If several <strong>IRDH375</strong>B or other bus-capable devices are interconnected in anetwork via the BMS bus, the BMS bus must be terminated at both ends witha 120 Ω resistor.An RS485 network that is not terminated, is likely to get instable and mayresult in malfunctions. Only the first and the last device in one line may beterminated. Devices in between must not be terminated with 120 Ω. Hence,stub feeders in the network must not be terminated. The length of the stubfeeders is restricted to 1 meter.1st device ... device last deviceA B A B A B120 W0.4 WStub feedermaximum 1 m120 W0.4 WMaximum length of the RS485 bus: 1200 mTGH1352en/11.200455
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