H Ardware - dixell XWEB 3000 Operating Instructions Manual

2 I N S T A L L A
2 I N S T A L L A
2.1 HARDWARE
ATTENTION: to protect both yourself and the computer from electrical hazards the XWEB 3000
should remain turned off until you are finished connecting all electrical devices to the unit.
To avoid accidental start of the unit, remember to plug in electrical cable only when you have
finished setting up all other connection.
2.1.1 CHECK THE RS485 BEFORE STARTING
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 attention 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.
•
Pay attention and respect the wire polarities when screwing them into the instrument terminals.
2.1.2 EACH INSTRUMENT IS PROVIDED WITH THE ADDRESS PARAMETER
ADR
•
The cable must have 2 or 3 wires with shield, minimum section 0,5mm
•
From the XWEB 3000 position the cable reaches all the instrument positions.
•
Do not execute loops or derivations:
Right connection
T I O N
T I O N
XWEB 3000 – rel.1.0 –
(eg. the BELDEN 8772).
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