Honeywell UDC3500 Product Manual page 359

Example #2
The following is another example of a request and response message using Function code
20.
Request Message (Read LSP #1 = ID Tag 39 and LSP #2 = ID Tag 53)
02 14 0E 06 00 03 00 27 00 02 06 00 03 00 35 00 02 (CRC16)
Where:
02
14
0E
06
00,03
00,27
00,02
06
00,03
00,35
00,02
(CRC16)
This is the response to the above request.
Response Message
02 14 0C 05 06 43 C8 00 00 05 06 44 60 00 00 (CRC16)
Where:
02
14
0C
05
06
43 C8 00 00 = 400.0 (Value of Local Setpoint #1)
05
06
44 60 00 00 = 896.0 (Value of Local Setpoint #2)
(CRC16)
3/07
= Address
= Function Code 20 (14 Hex)
= Byte Count
= Reference Type (IEEE Floating Point)
= File Number (Access Data Value)
= Register Address (Standard Access LSP #1 - ID Tag 39)
= Register Count to read (Floating Point Data)
= Reference Type (IEEE Floating Point)
= File Number (Access Data Value)
= Register Address (Standard Access LSP #2 - ID Tag 53)
= Register Count to read (Floating Point Data)
= Address
= Function Code 20 (14 Hex)
= Byte Count
= Data Byte Count (Sub Message Length)
= Reference Type (IEEE Floating Point)
= Data Byte Count (Sub Message Length)
= Reference Type (IEEE Floating Point)
UDC3500 Universal Digital Controller Product Manual
Modbus RTU Function Codes
343