User manual

Modbus RTU 17MN744
Text Handling (H2 Function Code 66)
These sub-functions are used to support text-handling functions.
Read Parameter Name Text (Sub-Code 1)
This PDU is used to read parameter names from the control card.
Request PDU
Byte 1
Byte 2 Byte 3 Byte 4
Function Code (66) Sub-Code (1) PN H PN L
Where,
Byte 1: Text Handing Function Code 66 (0x42)
Byte 2: Read Parameter Name Sub-Code
Byte 3-4: 16-Bit Parameter Number (PN)
Response PDU:
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 . . . Byte N-1 Byte N
Function Code (66) Sub-Code (1) PN H PN L ASCII . . . ASCII NULL
Where,
Byte 5 - N: Parameter Name
Null Terminated ASCII String of up to 16 characters
Language Determined by Drive Parameter
Read Parameter Help Text (Sub-Code 2)
This PDU is used to read parameter help text from the control card.
Request PDU
Byte 1
Byte 2 Byte 3 Byte 4
Function Code (66) Sub-Code (2) PN H PN L
Where,
Byte 1: Text Handing Function Code 66 (0x42)
Byte 2: Read Parameter Name Sub-Code
Byte 3-4: 16-Bit Parameter Number (PN)
Response PDU:
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 . . . Byte N-1 Byte N
Function Code (66) Sub-Code (2) PN H PN L ASCII . . . ASCII NULL
Where,
Byte 5-N: Parameter Help Text
Null Terminated ASCII String of up to 126 characters
Language Determined by Drive Parameter
Read List Parameter Text (Sub-Code 3)
This PDU is used to read list parameter list text from the control card.
Request PDU
Byte 1
Byte 2 Byte 3 Byte 4 Byte 5 Byte 6
Function Code (66) Sub-Code (3) PN H PN L Index H Index L
Where,
Byte 1: Text Handing Function Code 66 (0x42)
Byte 2: Read List Parameter List Text Sub-Code
Byte 3-4: 16-Bit Parameter Number (PN)
Byte 5-6: 16-Bit Index (1-Max) into List
Response PDU:
Byte 1
Byte 2 Byte 3 Byte 4 Byte 5 . . . Byte N-1 Byte N
Function Code (66) Sub-Code (3) PN H PN L ASCII . . . ASCII NULL
Where,
Bytes 7 - N: Parameter List Text
Null Terminated ASCII String of up to 16 characters
Language Determined by Drive Parameter