MI001458-E
ENGLISH - 8/16
MODBUS REGISTERS
Holding Registers
The 16-bit Holding Registers have the following structure:
The Bit notation [x:y] shown in the
table indicates all the bits from x
to y. For example, Bit [2:1]
indicates bit 2 and bit 1, and
illustrates the meaning of the
various linked combinations of
the values of the two bits.
Remember that the MODBUS 3,
6 and 16 functions (respectively
Supported MODBUS Commands
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Most significant
Bit
Least
Significant Bit
Index Bit
Word (16 bit): MODBUS Register
S203TA has MODBUS 16 bits (words) registers, accessible by RS485 communication. In
the next paragraphs, we shall describe the supported MODBUS commands, and the
functions of the registers.
16
Write Multiple Register
Writing of registers up to 16 words at a time
within the same group
06
Write Single Register
Writing of a word register
03
Read Holding Registers
Reading of registers up to 16 words at a time
within the same group
Code
Function
Description
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of multiple reading, single and multiple writing) can be executed on the following registers.
Default values are marked with * symbol.
The following indication (only readable or also writable) is probided for every register:
R: Readable - W: Writeable
