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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 4
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TR4090
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Wall pack, 12V @ 1A output, 120VAC input
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50 Ohm antenna with BNC connector
1.) Connect the BNC connector of the antenna to the TR4090’s BNC connector.
2.) Mount the TR4090 and the antenna to suit the application.
3.) Plug the jack end of the wall pack into the TR4090.
4.) Plug the AC end of the wall pack into a 120VAC outlet. The TR4090 is
ready to read tags.
3.0 SERIAL DATA FORMATS
The TR4090 automatically reads (no settings required) three tag data formats. That is, the
TR4090 recognizes legal tags by a one byte header that is programmed into the tag with the user
data following. To see this more clearly, the structure of the tag data for the three formats is as
follows:
Blank Tag
154 bits of Memory
BCH Data
Preamble Header BCH Encoded User Data Trailer Unused memory
0xFF 0x147 126 bits 0x147 0 bits
12 Byte Data with CRC
Preamble Header User Data CCITT-16 CRC Unused memory
0xFF 0x22 12 bytes 2 bytes 26 bits
15 Byte Data with CRC
Preamble Header User Data CCITT-16 CRC Unused memory
0xFF 0x11 15 bytes 2 bytes 2 bits
Since binary data can be difficult to view, the TR4090 converts the tag’s binary data to ASCII for
the 12 Byte data format and for the 15 Byte data format so that the information can be easily
viewed using HyperTerminal for instance.
The BCH data format is not converted to ASCII since once encoded, the data is not at all
recognizable as the original data. Converting this to ASCII therefore has no added benefit. In
order to properly view the original data, the data sent by the TR4090 to the HOST PC must be
decoded by the C function, BCHdecoder(), which is available from Checkpoint.
All three formats frame the data with ASCII start and stop characters. The following sections
describe the manner in which the TR4090 represents the tag’s data.