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C
C-15
GFK–0804B
Appendix C RTU Protocol
Message (07): Read Exception Status
Format:
Address
Func
Error Check
07
Query
Normal Response
Address
Func
Error Check
07
Data
Query:
This query is a short form of request for the purpose of reading the first eight output
points.
points.
H An address of zero is not allowed as this cannot be a broadcast request.
H The function code is equal to 07.
H The function code is equal to 07.
Response:
H The data field of the normal response is one byte in length and contains the states of
output points 01 through 08. The output states are packed in order of number with
output point one’s state in the least significant bit and output point eight’s state in
the most significant bit.
output point one’s state in the least significant bit and output point eight’s state in
the most significant bit.