07.22.13 OSCON 5k Glow Run
Multiple chip reads occur for each tag as it enters the energized field. For those starting in the second start wave, gun time deducts approx. 3 minutes 43 seconds (length of time between starts). Below is an explanation of how to under stand the raw chip data. “Participant to Bib#” file includes bib number, name, gender, age.
Example: Tag with an ID = 580011223344 is read at 14:05:20.39 on 2006-12-30 the date packet received from the reader would be:
where xx is the calculated LRC.
|0||Header character 1||Frame header, ‘a’|
|1||Header character 2||Frame header, ‘a’|
|2-3||Reader ID||0-255 in ASCII hex|
|4-15||Tag ID||MS digit first, excluding CRC|
|16-19||I and Q channel counter||Binary counters 0-255 in ASCII hex|
|20-33||Date/Time||Date and time with 10ms resolution. 390ms/10=39-”27″ (27= 0×32 + 0×37) and the month 12 is 0×31 + 0×32.|
|34-35||LRC||Checksum on bytes 2 to 33|
|36-37||End of packet (CR,LF)||0x0d, 0x0a|