Function Code 21 (15H) - Write Configuration Reference Data - Honeywell UDC3500 Product Manual

9.4 Function Code 21 (15h) - Write Configuration Reference Data

Introduction
Function Code 21 (15 Hex) is used in this instrument to allow writes of integer and
floating point values to the configuration database and override values.
The configuration database of this instrument is located in EEROM. The override values
are stored in RAM.
Integer format is used to write to "Digital" configuration items. Floating Point format is
used to write to "Analog" configuration items as defined by the configuration ID tags.
Write Restrictions
Care should be taken not to exceed the 100,000-write limit of the EEROM.
Request and Response Formats
The Request and Response formats for Function code 21 (15 Hex) are shown below.
Details for each block reference follow.
Request Message Format
Slave
Address
Data
Response Message Format (echo back of request)
Slave
Address
Data
The register address is interpreted by this instrument as the tag ID configuration number.
For Infrared Transactions, add three BOFs (C0hex) at the beginning of each message and
one EOF (Ffhex) at the end of each message.
Reference Type Definitions
The Reference Type definition is always 06.
See examples in Subsection 9.4.1
10/05
Function Byte Reference
Code 15 Count Type
Data Data Data
Function Byte Reference
Code 15 Count Type
Data Data Data
UDC3500 Universal Digital Controller Product Manual
File Register
Register
Number Count
Address
File
CRC
Number Data
File Register
Register
Number Count
Address
File
CRC
Number Data
Modbus RTU Function Codes
CRC
Data
CRC
Data
325