User's Manual
LF Transmitter Output
5-8 Configuration and Operation
Note When more than one Exciter EX21 is used to create a wider excitation zone, a magnetic coupling
can appear. The phenomenon is explained in Chapter 4, Setup Guidelines in the RFID System S21
Technical Guide. The coupling generates an unwanted amplitude modulation with a frequency of
several Hertz, the modulation depth depending directly on the coupling. The installer has to
monitor the TAP signal and adjust the position of the EX21 frames to obtain a minimum unwanted
modulation depth. The installer can increase the distance between frames, level the frames in the
same plane, or place the frames with the shorter sides (1m) in parallel. The minimum amplitude of
V
TAP
due to unwanted modulation must be larger than 60V
pp
.
4. Turn off the excitation field, by typing:
C<Enter>
The TAP voltage amplitude should be zero.
5. Turn on the LF field again, by typing:
B <Enter>
The TAP voltage signal should have the same value as measured in Step 4.
6. Set the wanted excitation mode.
To set a specific excitation mode, refer to Appendix C, Excitation Modes. If you want to return
to the initial excitation mode as determined in Step 2, you have to restore the values of the
parameters modified in Step 3.
For example, Lyngsoe recommends the following parameter values for the Conditional
Switching AC mode (CSAC) for the IPC installation:
RCS=Y; RES=Y; REM=C; RET=A; HCC=8; HCS=7; HE0=18; HE1=6
These parameters all have the default values.
7. Check the excitation field pattern as set in Step 7, by monitoring the TAP voltage.
For example, if the IPC’s CSAC mode was set and the Reader did not receive a valid message,
the TAP voltage has the following repetitive pattern: a carrier of 125.00 kHz modulated ON/
OFF with 610Hz for 60 ms, followed by no signal for 180 ms.
8. Save the excitation mode set in Step 7, by typing:
:CONFIG:STORE <Enter>
:RESET <Enter>
9. Check the parameter values set in Step 7 again.
10. Check the auto-diagnostic feature, by typing:
:DAR=Y <Enter>
:TEST:EXCITER k <Enter>
where k is the decimal address (1, 2, 3,...) of the Exciter that you want to test.
The response should be 00, followed by a number (between IP-2 and IP) of messages from the
Test Tag.