IAI America REXT - Manual (Page 162)

0
Part 1 Specification
Chapter 3 Gateway R unit
138
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.
-162-