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1592028150 XWEB300D_500_500D stp GB r2.1 2012.06.22.doc
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2. RS485 CONNECTION
To be connected to the serial line all the Dixell Modbus instruments must be
provided with direct RS485 terminals or the “TTL”-RS485 interface (XJRS485 or
XJ485). Check the instrument manuals for more information. The RS485 line is
mainly based on two polarised terminals. Please pay respect to the right
sequence for all the devices connected to the serial line.
Follow these important instructions:
The RS485 serial line must reach all the instruments where they are installed.
Make sure of the wire polarities when screwing them into the instrument
terminals.
The cable must have 2 or 3 wires with shield, minimum section 0,5mm
2
(eg. the
BELDEN 8772).
From the XWEB 500 position the cable reaches all the instrument positions.
Do not execute loops or derivations:
Right connection