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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.
Summary of Contents for RoboNet
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