Dixell XWEB 3000 Installation Guide download pdf (Page 7)

XWEB SERIES Installation Guide

04/11/2004 1592017000 Pg. 7/74

3 RS 485 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 beware to respect the right sequence for all the

devices connected to the serial line.

Follow these important advises:

• The RS485 serial line must reach all the instruments where they

are installed.

• Beware to the wire polarities when screwing them into the

instrument terminals.

• The cable must have 2 or 3 wires with shield, minimum section

0,5mm

(eg. the BELDEN 8772).

• From the XWEB 3000 position the cable reaches all the

instrument positions.

• Do not execute loops or derivations:

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Dixell XWEB 3000 Installation Guide Page 7