Electrical connection Liquiline CM442R/CM444R/CM448R
34 Endress+Hauser
6.5 Connecting digital communication
6.5.1 Module 485
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Fig. 41: Bus connections on module 485
* To supply power to an external terminating
resistor for bus termination
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Fig. 42: Wiring diagram for module 485
LEDs on front of module
LED Designation Color Description
RJ45 LNK/ACT GN • Off = Connection is not active
• On = Connection is active
• Flashing = Data transmission
RJ45 10/100 YE • Off = Transmission rate 10 MBit/s
• On = Transmission rate 100 MBit/s
PWR Power GN Supply voltage is applied and module is initialized
BF Bus failure RD Bus failure
SF System failure RD System failure
COM Communication YE Sending or receiving Modbus message
T Bus termination YE • Off = No termination
• On = Termination is used
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