Modbus network
Construction of Modbus network
Modbus construction
Modbus (RTU - RS485/EIA485) is established via an enamelled twisted pair of conductors as well as
ground. Data+ and Data- must be in the same twisted pair set, for instance yellow/green or brown/
white in a LIYCY-P cable.
It must be a multi drop connection. Do not use a star connection or similar cabling. There can be up to
10 ventilation units per gateway. Bitzer has junction boxes so conductors and wires can be connected
correctly. The cable from the junction box to the control system should be kept as short as possible in
order to avoid signal reflections.
Modbus cable specification
Communication is half-duplex.
• Max. 250m twisted pair cable, grounded enamelled wire and grounding wire
• Cable type: Belden 941/942 or multi cable LIYCY-P 2*2*0,25 mm
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