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 | = | Address |
15 | = | Function Code 21 (15 Hex) |
0B | = | Byte Count |
06 | = | Reference Type (IEEE Floating Point) |
00 03 | = | File Number (Access Data Value) |
00 01 | = | Register Address (Standard Access - Gain 1 - ID Tag 1) |
00 02 | = | Register Count (Floating Point Data) |
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)
188 | UDC2500 Universal Digital Controller Product Manual | 4/07 |
