User's Manual

i-PORT MB – Manual
Version 1.1 02.02.2007 Page 21/ 37
process_response_telegram();
}
2 The transmitted AgeCount contains the lower 8 bits b0..b7
and the highest 8 bits b20..b27 of the tag age counter
c0..c15 (this is the result of a “mapping” of the 32 bit age
counter on the tag to 2 byte transmitted by RF).
The lowest bits are used to change telegram contents and encryption between transmissions while
the upper bits are used to estimate tag life (and remaining lifetime). This byte counts up by one
roughly all 1 million telegrams (12 days @ 1 second ping rate).
3 9 byte of data, can be programmed according customer’s need by IDENTEC SOLUTIONS or
representative
4 1 byte of flags, are set during programming of tag. Depending on tag version additional information
(i.e. battery status in bit7) can be part of this byte. The lowermost 6 bit are freely available (Tag
Firmware 0.3).
5 Signal strength of tag as signed char (0xff = -1dBm, 0x80 = -128dBm). This is the maximum RSSI
value of the last detection recorded on both antennas. If the last detection was on 1 antenna only
then the reader returns the RSSI of this antenna.