User's Manual

Message Format
Transponder T95 Messages B-1
Appendix B
Transponder T95 Messages
Message Format
Each message has the following format
where:
Prmbl = 0.7 ms continue 1.
Sync = a string of 10 bits of “0101010101”; transmitted only if SM=Y.
Start = a string of 13 bits “0101010000111”; transmitted only if SM=Y.
SC = 2 bytes system code; transmitted only if TS=Y.
UD = user definable data; number of bytes is set by CC (1 to 32).
CRC = 2 bytes CRC; transmitted only if EC=Y.
Flag = 2 bytes message flags; transmitted only if TF=Y. It has 1 byte if HF=N and
2 bytes if HF=Y.
Key = 1 byte message key; transmitted only if EN=Y.
T95 Parameters The parameters that control the message transmission for T95 are shown in the table
below:
Total Transmission
Time
After a valid excitation, the T95 transmits the initial number of messages defined by
the IP parameter, followed by an extra number of messages (up to the RC) for as long
as the excitation exists. Then it goes to sleep.
There is a random delay called InterMsgDelay that occurs between two consecutive
messages. This is implemented to ensure that the delay time does not repeat itself
before 32 messages have occurred.
Parameter Range Description
DR 3,4 Data rate; DR3 = 19.2 kbps, DR4= 38.4 kbps
EC Y/N Standard error check transmitted
EN Y/N Data encryption available
HF Y/N Flags in hexadecimal
ID 0...200 Initial delay
IP 1...200 Initial number of messages transmitted after a valid execution
LT Y/N Limit repeated transmissions
RC 0...255 Number of extra messages transmitted after IP during a continuous excitation
RS 0...255 Random seed
SD 1...220 Subsequent delay
SM Y/N Synchronous preamble transmitted
TF Y/N Transmit Flags
TS Y/N Transmit System Code