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5.5. Recommended guidelines for
cable routing
• Signal, control and communication cables should be
shielded with braided shielding and the shield connected
to the earth connection – preferrable at the master
controller.
• Signal, control and communication cables should
be routed so the influence from the power cables is
minimized. When crossing power cables, an 90 degrees
angle should be achieved
• Signal and power cables that run in parallel should be
separated by the largest possible appropriate clearance
distance, approx. 20 – 25 cm. A grounded shield plate or
grounded metal duct can be used instead.
• The cable shielding must not be interrupted.
• The cables should be kept as short as possible.
Route cables using grounded, metal cable trays or cable
ducts. Sections of cable tray or ducts must be connected
together with as large areas as possible.
• Communication cables should be twisted pair for the
data wires.
6. Setup
Communication with the LMC341 DIWE is via Modbus
(RTU). Configuration and reading of settings and readings
from the LMC341 DIWE is described in the following
sections.
Client
Server
Initiate request
Perform the action.
Initiate the response
Receive the
response
Function code Data Request
Function code Data Response
6.1. Modbus configuration
Specification of the protocol:
Protocol:
Modbus (RTU mode)
See http://www.modbus.org/specs.php
Modbus node address:
LMC341 DIWE uses default address 1; can be
changed on the LUP200 display (option)
Baud rate:
Default 115200; 4800, 9600, 19200, 38400,
57600 are selectable
Number of data bits:
8
Parity:
Default Even; None and Odd parity are selectable
Number of stop bits:
Default 1; 2 (2 only if Parity is None)
Packet size:
Maximum 32 register in a row
Settings are configured on the LUP200 display of the
LMC341 DIWE controller in the Service->LOM MB config
menu.
Please observe that register numbers used in this manual
are zero-based as the LMC341 DIWE uses PDU telegrams.
