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C
C-17GFK–0804B Appendix C RTU Protocol
Message (17): Report Device Type
Format:
Address Func
17
Normal Response
Type
Device
Count
Data Error CheckByte
Address Func
17
Error Check
Query
66
Slave
Run
Mode
5
Query:
The Report Device Type query is sent by the master to a slave in order to learn what
type of programmable control or other computer it is.
An address of zero is not allowed as this cannot be a broadcast request.
The function code is equal to 17.
Response:
The byte count field is one byte in length and is equal to 5.
The device type field is one byte in length and is equal to 66.
The slave run mode field is one byte in length. The slave run light byte is equal to
OFFH if the Micro PLC is running. It is equal to 0 if the Micro PLC is not running.
The data field contains three bytes.
1st Byte = 30H if the Micro PLC is a 14-point or 16-point unit
32H if the Micro PLC is a 28-point unit
2nd Byte = 30H if the Micro PLC Expander is a 14-point unit
32H if the Micro PLC Expander is a 28-point unit
0H if the Micro PLC Expander is not present
33H if the Micro PLC Expander is an analog unit
3rd Byte = 0