1
Download User Manual
Transcript
12.2.6 Block Check Character (BCC) The BCC is used to detect transmission errors. The BCC is calculated XOR-ing each byte of the transmission frame excluding the STX/BCC and ETX characters. The flags are part of the data. BCC = ( StatID) XOR ( Length) XOR (Command / Data 0 ) XOR ... XOR (Command / Data N ) 12.2.7 ETX End of transmission. (03h) 12.2.8 Remarks If the reader device receives an invalid instruction frame (i.e. wrong BCC) or the requested station ID does not match the internal ID of the reader, the command is not executed. The reader waits for the next valid frame. The automatic binary time-out (see protocol configuration register) is used to detect incomplete binary frames. 12.2.9 Examples: 02h 64h 01h 78h 1Dh 03h STX Station ID Length ‘x’ BCC ETX This instruction frame will reset the reader module with the station ID 64h.
