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3.4.5 "Function Code" 43 (Encapsulated Interface Transport)
This "Function Code" 43 / 14 (Read Device Identification) allows you
to read device-specific data.
Modbus request Structure of the Modbus request:
Field Bytes Value Meaning
Function Code 1 43 = 2B
h
Encapsulated Interface Transport
Modbus Encapsula-
ted Interface Type
1 14 = 0E
h
Fixed value 14 (Read Device Identification)
Read Device ID
Code
1 01 Read all objects
Object ID 1 0x00 Object ID
Modbus response Structure of the positive Modbus response:
Field Bytes Value Meaning
Function Code 1 43 = 2B
h
Encapsulated Interface Transport
Modbus Encapsula-
ted Interface Type
1 14 = 0E
h
Fixed value 14 (Read Device Identification)
Read Device ID
Code
1 01 Corresponds to the Modbus request
Conformity Level 1 02 Fixed value
More Follows 1 00 Fixed value
Next Object ID 1 00 Fixed value
Number Of Objects 1 03 Number of objects
Object ID 1 Object ID, see table
Object Length 1 Object length
Object Value (various) Object data (various)
Structure of the negative Modbus response
Field Bytes Value Meaning
Function Code 1 2B
h
+ 80
h
= AB
h
Encapsulated Interface Transport
Exception Code 1 01
h
... 04
h
See chapter
"3.3.2 Modbus response to a Modbus request"
Object ID The following object IDs are available:
Object ID Object name Value
00
h
vendor name Manufacturer name
01
h
product code „xxxxxxxxxxxx“ (see type code)
03
h
revision "Vxx.yyy" (e.g. "V02.001")
3 Basics
LXM32M
32 Modbus-TCP module
0198441113843, V1.01, 01.2012