Modbus Rtu Function Codes; Overview; General Information - Honeywell UDC3500 Product Manual

9.1 Overview

This section describes the function codes needed to upload and download the
configuration from a host computer into the instrument.
What's in this section?
The following topics are covered in this section.
9.1 Overview

9.2 General Information

9.3 Function Code 20
9.4 Function Code 21
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.
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9 Modbus RTU Function Codes

TOPIC
UDC3500 Universal Digital Controller Product Manual
Modbus RTU Function Codes
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