Model: LC5296-XP-AT / LC5296-XP/LC5296-XP-I
Doc. Ref. no. :- m61D/om/101
Issue no. 17
User’s Manual Page 49 of 56
11. COMMUNICATION PROTOCOL–MODBUS RTU
11.1 INTRODUCTION
The unit can be connected in RS-485 communication data link either in multi drop or
repeat mode. Each unit must have unique Serial Number. Entire range of addresses
(1 to 247) may be used. Before starting any communication, choose a baud rate
compatible to the host computer. The serial protocol used is MODBUS RTU.
Function Code for Modbus
Use to read Relay and Digital output status
Use to read PV, Control, RSP output etc
Use to read programmable registers
Use to write programmable register
The error checking field contains a 16-bit value implemented as two eight-bit bytes.
The error check value is the result of a Cyclical Redundancy Check (CRC)
calculation performed on the message contents.
11.2 Modbus Parameter Address
NOTE:Process Value (PV) Error Conditions Value
OPEN : 32767
UNDER : 32765
OVER : 32766
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