M08P40G16-00 WSH-XEE2
10.2-120.2
17
5.8 Modbus - RS485
Option
LED BSP
communication with AP1 module
LED BUS
communication with Modbus
green
communication ok
green
communication ok
yellow
software ok but communication with AP1
down
yellow
startup / channel not communicating
red
flashing: software error
red
communication down
fixed: hardware error
A.
Unit
B.
Metal
conduit
C.
Metal
septums
D. Metal-lined sheath (sleeve)
Modbus / LonWorks / Cable requirements
Couple of conductors twisted and shielded
Section of conductor 0,22mm2…0,35mm2
Nominal capacity between conductors < 50 pF/m
Nominal impedance 120 Ω
Recommended cable BELDEN 3106A
•
Every RS485 serial line must be set up using the ‘In/Out’ bus system.
•
Other types of networks are not allowed, such as Star or Ring networks.
•
The difference in potential between the earth of the two RS485 devices that the cable shielding needs to be connected to must be lower
than 7 V
•
There must be suitable arresters to protect the serial lines from the effects of atmospheric discharges
•
A 120 ohm resistance must be located on the end of the serial line. Alternatively, when the last serial board is equipped with an internal
terminator, it must be enabled using the specific jumper, dip switch or link.
•
The cable must have insulation features and non-flame propagation in accordance with applicable regulations.
•
The RS485 serial line must be kept as far away as possible from sources of electromagnetic interference.
Содержание WSH-XEE2 10.2
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