Modbus RTU Function Codes
9.3.1 Read Configuration Examples
Example #1
The following is an example of a request to read the Gain 1 value using Function code 20.
Request Message (Read (Gain 1) = ID Tag 001)
02 14 07 06 00 03 00 01 00 02 (CRC16)
Where:
02 | = | Address |
14 | = Function Code 20 (14 hex) | |
07 | = | Byte Count |
06 | = | Reference Type |
00,03 | = File Number (Access Data Value) | |
00,01 | = | Register Address (Standard Access Gain 1 - Tag ID #1) |
00 02 | = Register Count (Floating Point Data) | |
(CRC16) |
|
|
This is the response to the above request.
Response Message
02 14 06 05 06 3F C0 00 00 (CRC16)
Where:
02 | = Address |
14 | = Function Code 20 (14 Hex) |
06 | = Byte Count |
05 | = Sub Message Length |
06= Reference Type (IEEE Floating Point) 3F C0 00 00 = 1.50 (Value of Proportional Band) (CRC16)
184 | UDC2500 Universal Digital Controller Product Manual | 4/07 |
