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)
Modbus Read, Write and Override Parameters
This section contains information concerning Reading, Writing, and
Overriding parameters in UDC2800 Process Controller. There are two
types of parameters:
n
Data Transfer - These parameters include reading control data,
option status, and reading or changing setpoints.
n
Configuration Data - All the configuration data is listed in the order
in which it appears in the controller.
Each type of parameter has the identifying codes listed with it.
General Information
Analog Parameters
Whenever analog register addresses (those that can be changed via
communications) are changed, a Write cycle occurs after receipt of
the message and the response is returned.
Override Parameters
Override analog register address 107 (computer setpoint) is not
stored in non-volatile memory. It can be changed as frequently as
desired with no effect on non-volatile memory retentivity, but the
controller must remain in the slave mode.
Digital Parameters
Whenever digital configuration register addresses are updated via
communications, the non-volatile memory is updated as soon as the
message is received.
323
Chapter 11 - Modbus RTU Function Codes 20&21
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