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4
Operating modes of the reader
In the AEy instruction set there are two operational modes defined:
•
MD 0 - continuous mode
•
MD 2 - the reading process is triggered by the serial interface
In the next capters can you find a detailed functional description.
The default mode is MD 2.
4.1
MD 2 - triggered by an software command
The master sends the command to read a transponder code. The reader answers with the code or an error
code.
You can execute specific commands “Read” (RD) and “Write” (WD) just in mode MD2.
In operating mode 2, the exciter is always turned off. Triggered by the software command (yT; RD;
WD), the exciter is activated. After successful reading or writing of a transponder number the exciter is
turned off automatically.
Figure 9: Software triggered reading operation
If the first reading cycle yields no result (NoRead), the on-time of the exciter is limited by the param-
eter TOR (time out reader): Reading cycles are continuously started until either a transponder is read
successfully or the time span corresponding to the value of the parameter TOR has expired. The read-
er will not interrupt the last running readout cycle. If no transponder number has been read, a
NoRead is output.
exciter
processor
interface
reading cycle
ID
GT
