16502 PIREG-C2 Gerätebeschreibung mit EtherNet_IP Bussystem191017 - EN.docx/ Page 16 of 66
4.6. RS485 interface acknowledgements
During communication via the RS485 interface, acknowledgement is identified through the function field
FF in the response telegram.
4.6.1. OK acknowledgement
Syntax: Acknowledgement: Function field FF = 00h in the response telegram
Description: The OK acknowledgement is given by setting the function field FF to 00h. This is done
directly in the response telegram, either as a long or short set.
Example Message: 10 21 00 21 16 (short set, GA = 21h)
Reference: Error acknowledgements
4.6.2. Command lock
Syntax: Acknowledgement: Short set, function field FF, bit 3 = 1
Description: The PIREG-C2 transmits this acknowledgement if the telegram's activities have not yet
been approved or if the code number entered is incorrect.
In addition, the PIREG-C2 transmits this acknowledgement if an error occurs when sav-
ing data to the EEPROM memory.
Example Message: 10 21 08 29 16 (short set, GA = 21h)
Reference: OK acknowledgements
4.6.3. Command error
Syntax: Acknowledgement: Short set, function field FF, bit 4 = 1
Description: The PIREG-C2 transmits this acknowledgement if the code of the function field FF or the
command index BI is unknown to the controller.
Example Message: 10 21 10 31 16 (short set, GA = 21h)
Reference: OK acknowledgements
4.6.4. Transfer error
Syntax: Acknowledgement: Short set, function field FF, bit 5 = 1
Description: The PIREG-C2 transmits this acknowledgement if a parity error occurs or if the checksum
PS is defective.
Example Message: 10 21 20 41 16 (short set, GA = 21h)
Reference: OK acknowledgements
4.6.5. Syntax or parameter error
Syntax: Acknowledgement: Short set, function field FF, bit 7 = 1
Description: The PIREG-C2 transmits this acknowledgement if there is a syntax or parameter error in
the telegram of the command received or if the telegram is incomplete.
Example Message: 10 21 80 A1 16 (short set, GA = 21h)
Reference: OK acknowledgements
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