25 July 1996
23 mm Transponder Reference Manual
Page 9 of 22
TRANSMITTER OFF
TXCT -
HIGH BIT
PROGRAM
WRITE
LOW BIT
TRANSMITTER ON
toffH
tonH
toffL
tonL
tprog
tH
tL
Figure 8: The Write and Program Function
RF MODULE
TXCT- SIGNAL
READ
20 ms
CHARGE
50 ms
KEYWORD
16
16 ms
160 ms
32 ms
PROGR.
15 ms
PASSWORD
16 ms
112 bit
309 ms
WRITE
WRITE DATA
128 bit
LSB
MSB
WRITE FRAME
8
80
8
WRITE
Figure 9: Write Data Format for Programming Function
5. Characteristics of the Pulsed FM System
5.1 Basic System Data
The TIRIS Pulsed FM system multiplexes the power and read functions avoiding compromises.
This results in the following characteristics and options:
a) Individual optimization of the power and read functions by the system designer.
b) Variation of powering time by S/W to trade-off speed/current consumption with other
parameters
c) Absence of the high powering signal during the data reception phase
d) Data transmission by an active oscillator. This is associated with a high signal strength
level and a high transponder efficiency.
e) NRZ modulation encoding for high data speed and low transmission bandwidth.
