Appendix
A.3 Connection of serial devices via Freeport protocol
SIMATIC RF120C
Operating Instructions, 02/2021, C79000-G8976-C328-03
53
A.3.5 Block-specific error messages
The following table lists the block-specific error codes that can occur when working with
optical handheld readers, access control readers or serial devices.
Table A- 4 Block-specific error messages
Address error in command (≠ "0x0000", "0x0002", "0xFFFF")
Negative acknowledgment or bad frame from the reader
New data was received before existing data was fetched.
• Scan operation: The newest data is lost.
With the "Write" command, the oldest acknowledgments are lost without an error
Internal communication error
Invalid data block number (DBN) on the reader/communication module
Unknown command, incorrect command parameters or unauthorized command
chaining (incorrect length specification)
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