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Part 1 Specification
3.9.3.4 Preset Single Register (Query using FC = 06H)
Data is written to (changed in) a holding register 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 writing
(changing) 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
06 H
1
Starting address
(upper)
Arbitrary
Starting address
(lower)
Arbitrary
2
The address varies depending on the axis
arrangement.
New data (data written) (upper)
Arbitrary
New data (data written) (lower)
Arbitrary
2
Error check
(CRC)
16 bits
2
Based on calculation result
Trailer None
-
Total bytes
8
[2] Response format
If the data has been changed (written) successfully, the response is the same as the query.
If invalid data has been sent, no response is returned.
Содержание RoboNet
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