User's Manual

Chapter Two Installation
man_905_2.1.doc Page 21
RS485 is a balanced, differential standard but it is recommended that shielded, twisted pair cable
be used to interconnect modules to reduce potential Radio Frequency Interference (RFI). An
RS485 network should be wired as indicated in the diagram below and terminated at each end of
the network with a 120 ohm resistor.
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