User Guide
TR4090 USER’S GUIDE
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CHECKPOINT SYSTEMS, INC. CONFIDENTIAL AND PROPRIETARY INFORMATION, FOR INTERNAL USE ONLY.
Dwg. No. 265245 Rev. 00 Page 5
3.1 BCH-ENCODED DATA
If the tags used are BCH-encoded, the data sent from the TR4090 to the HOST PC via an RS-232
serial port will have a start character of an ASCII capital ‘H’, followed by 126 bits of BCH-
encoded binary data, and an end character which is an ASCII capital ‘N’.
For example, the data read by the Reader will be of the form:
Preamble Header BCH Encoded User Data Trailer Unused memory
0xFF 0x147 126 bits 0x147 0 bits
and the data sent out by the Reader to the HOST will be of the form:
ASCII Start Charcter Header, BCH Encoded User Data, Trailer ASCII End Character Total Bytes Sent to
HOST
‘H’ 146 bits + 6 padded 0s (19 bytes) ‘N’ 21 bytes
3.2 12-BYTE ASCII DATA
If the tags used have the 12 byte data format, the data sent from the TR4090 to the HOST PC via
an RS-232 serial port will have a start character of an ASCII capital ‘T’, followed by 24 bytes of
ASCII data, and an end character which is an ASCII capital ‘N’. All characters are therefore
ASCII and so can easily be viewed using HyperTerminal for example.
Note: The 24 bytes of ASCII data are the result of converting each nibble that make up the 12
bytes of tag data to ASCII.
For example, the data read by the Reader will be of the form:
Preamble Header User Data CCITT-16 CRC Unused memory
0xFF 0x22 12 bytes 2 bytes 26 bits
and the data sent out by the Reader to the HOST will be of the form:
ASCII Start Charcter User Data ASCII End Character Total Bytes Sent to
HOST
‘T’ 24 bytes ‘N’ 26 bytes
Example:
Contents of Tag in binary form
Preamble Header User Data CCITT-16 CRC
FF 22 01 23 45 67 89 AB CD EF AA BB CC DD 6B 07
The data sent out by the Reader to the HOST will be:
ASCII
Start
Charcter
24 Bytes of User Data in ASCII representation ASCII End
Character
‘T’ ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’ ‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’ ‘A’ ‘A’ ‘B’ ‘B’ ‘C’ ‘C’ ‘D’
‘D’
‘N’
3.3 15-BYTE ASCII DATA
If the tags used have the 15 byte data format, the data sent from the TR4090 to the HOST PC via
an RS-232 serial port will have a start character of an ASCII capital ‘X’, followed by 30 bytes of