Webdyn WebdynSunPM User Manual page 24

USER GUIDE – WebdynSunPM
For device wiring, please observe the standard recommendations for communication equipment via
the RS485 / RS422 protocols.
Devices must be wired with a bus topology.
The wiring can be in full duplex mode on four wires or in half duplex mode on two wires.
In the latter (two wires), the same line is used for transmission and reception. It is therefore
necessary to loop back on the WebdynSunPM transmission and reception hub.
We recommend the use of shielded twisted pairs (general shielding) with a minimum cross-section of
0.20 mm², and an impedance of 120 ohms.
For a given signal (Tx or Rx) use the same pair for the + and - terminals of the signal, and connect the
shield at one end to earth to ensure it is equipotential.
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WebdynSunPM – User guide — Version 1.0