dixell XWEB5000 EVO, Installation Manual

Page: 7 / 72

XWEB SERIES Installation Guide
1592010850 23/05/2007 Pg. 7/72
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 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 XWEB5000 position the cable reaches all the
instrument positions.
•
Do not execute loops or derivations: