GE GFK-0804B manual Message 17 Report Device Type Format

C

Message (17): Report Device Type

Format:

Address Func 17

Error Check

Query

Address Func 17

Byte	Device	Slave
Count	Type	Run
5	66	Mode

Data

Error Check

Normal Response

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.

HAn address of zero is not allowed as this cannot be a broadcast request.

HThe function code is equal to 17.

Response:

HThe byte count field is one byte in length and is equal to 5.

HThe device type field is one byte in length and is equal to 66.

HThe 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.

HThe 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

GFK±0804B Appendix C RTU Protocol C-17