M07Z40M15-02 CSRN-XHE2 FFA 12.2-24.4 15
6.8 COMMUNICATION MODULES
Serial communication module for Modbus supervisor
Serial communication module for BACnet supervisor
Serial communication module for LonWorks supervisor
DATA LINE FEATURES
Every RS485 serial line must be set up using the ‘In/Out’ bus system.
The dierence in potential between the earth of the two RS485 devices that the cable shielding needs to be connected to must be lower than
7 V
There must be suitable arresters to protect the serial lines from the eects of atmospheric discharges
A 120 ohm resistance must be located on the end of the serial line. Alternatively, when the last serial board is equipped with an internal
terminator, it must be enabled using the specic jumper, dip switch or link.
The cable must have insulation features and non-ame propagation in accordance with applicable regulations.
The RS485 serial line must be kept as far away as possible from sources of electromagnetic interference.
1. Unit
2. Metal conduit
3. Metal septums
4. Metal-lined sheath (sleeve)
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