Part 1 specification – IAI America REXT User Manual
Page 179
Part 1 Specification
Chapter 3 Gateway R unit
155
Part 1 Specification
3.9.3.5 Preset Multiple Registers (Query using FC = 10H)
Data is changed in (written to) multiple successive holding registers in the slave.
The basic query/response structures and examples of queries are shown below.
(1) Basic Query/Response Structures
[1] Query format
The query message specifies the address of the holding register (gateway register) from which to start changing
(writing) data, and the data.
Data length of 1 holding register = 1 word = 2 bytes = 16 bits
Field name
RTU mode data
(8 bits)
Data length
(bytes)
Remarks
Header
None
-
Slave address
3F H
1
Fixed.
Function code
10 H
1
Starting address
(upper)
Arbitrary
Starting address
(lower)
Arbitrary
2
The address varies depending on the axis
arrangement.
Number of registers
(upper)
Arbitrary
Number of registers
(lower)
Arbitrary
2
Bytes
Arbitrary
1
New data 1
(upper)
Arbitrary
New data 1
(lower)
Arbitrary
1 each for upper
and lower words
2
New data 2
(upper)
Arbitrary
New data 2
(lower)
Arbitrary
1 each for upper
and lower words
2
New data 3
(upper)
Arbitrary
New data 3
(lower)
Arbitrary
1 each for upper
and lower words
2
Error check
(CRC)
16 bits
2
Based on calculation result
Trailer
None
-
Total bytes
15
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