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None of these messages are supported in broadcast mode (i.e., writes
to address zero).
13.2
The Register Map.
A UF3300 Modbus register is depicted in Figure 24. A few points need
to be noted. The interpretation of Modbus registers or register sets is
important. All data is in BIG ENDIAN format. In BIG ENDIAN format the
most significant portion of a number is stored in the lower addresses.
To help visualise BIG ENDIAN format see Figure 24. Each register is a
16-bit quantity whose size is often referred to as a word.
MSWord
MSByte
LSBbyte(s)
Register
Register Offset Address
0
MS – Most Significant
LS – Lower or least significant
Issue 1.1 March 2022
1
Figure 24 - Big Endian Data Format
LSWord
Register
2
Register
3
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