Modbus RTU Function Codes
180
UDC2500 Universal Digital Controller Product Manual
4/07
9 Modbus RTU Function Codes
9.1 Overview
This section describes the function codes needed to upload and download the
configuration from a host computer into this instrument.
What's in this section?
The following topics are covered in this section.
TOPIC
See Page
9.1 Overview
180
9.2 General Information
180
9.3 Function Code 20
182
9.4 Function Code 21
186
9.2 General Information
This instrument uses a subset of the standard Modbus RTU function codes to provide
access to process-related information. Several MODICON function codes are
implemented. It is appropriate to define instrument-specific "user-defined" function
codes. Where differences occur between the two protocols it will be noted. Several
standard Modbus RTU function codes are supported.
Configuration ID Tags
Function codes
20
and
21
use the RS422/485 tag IDs for accessing configuration and
process-related data. These tags are fully explained in
Section 10.
The tag IDs represent the register addresses used in the Request Message.
Other Modbus Codes
For Modbus codes
other than
for accessing configuration and process-related data for
this controller, refer to the Modbus RTU Serial Communications User Manual # 51-55-
25-66.
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