Modbus RTU Function Codes
342
UDC3500 Universal Digital Controller Product Manual
3/07
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)
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