Request Message Format
Response Message Format (echo back of request)
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 Write Configuration Examples for more information.
File Number
The file number word contains the register number from the register
address structure shown in table Integer Parameter Type and table
Floating Point Parameter Type. Although the register address
structure tables indicate up to 13 data registers are available for
access, only register address 3 is currently supported.
Register Address
The register address is used to designate the tag ID number for the
parameter being accessed. The register address is made up of two
bytes—the MSB = 00 always. The LSB contains the tag ID number.
The tag ID numbers represent the parameter’s register address
(es).See Modbus Read, Write and Override Parameters for more
information.
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Chapter 11 - Modbus RTU Function Codes 20&21
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