User's Manual

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2.2 Operating mode 0 - continuous mode
When operating continuously the exciter is switched on permanently. The reading cycles are initiated peri-
odically.
After an accomplished reading cycle the reading information is evaluated. After that data (either trans-
ponder number or NoRead code) is output to the serial interface.
exciter
processor
interface
reading cycle
ID ID ID
reading cycle reading cycle
Figure 2.1: continuous operation
2.3 Operating mode 1 - running externally triggered
In operation mode 1 the exciter is turned off. As soon as the external triggered signal rises from logic 0
to 1, the exciter is started and a reading process is initiated.
trig_in
processor
interface
exciter
ID
reading cycle
Figure 2.2: external triggering -limitation of the switch period through a successful reading
After a successful reading cycle, the exciter is turned off immediately (irrespective of the trigger signal).
The next reading cycle starts at the next leading edge (0 to 1) of the trigger signal.
If a reading cycle is not successful, the reading process is controlled by the state of the external trigger
signal: further reading cycles are started as long as either a successful cycle has occurred or the exter-
nal trigger signal is logic 0 again. In the latter case the identification NoRead code is output.