Write Configuration Examples - Honeywell UDC3500 Product Manual

Modbus RTU Function Codes

9.4.1 Write Configuration Examples

Example #1
The following is an example of a request to write the Gain 1 value using Function code
21 (15 Hex).
Request Message (Write Gain 1= 1.5 "ID Tag 1")
02 15 0B 06 00 03 00 01 00 02 3F C0 00 00 (CRC16)
Where:
02
15
0B
06
00 03
00 01
00 02
3F C0 00 00 = 1.50
(CRC16)
This is the response to the above request.
Response Message (The response is an echo of the request)
02 15 0B 06 00 01 00 02 00 02 3F C0 00 00 (CRC16)
346
= Address
= Function Code 21 (15 Hex)
= Byte Count
= Reference Type (IEEE Floating Point)
= File Number (Access Data Value)
= Register Address (Standard Access - Gain 1 - ID Tag 1)
= Register Count (Floating Point Data)
UDC3500 Universal Digital Controller Product Manual 3/07