User's Manual
General Guidelines
Troubleshooting 7-3
1.1.3. Mismatched serial
communication
parameters.
1. Perform a power on reset. Wait until the Data LED
goes off.
2. Push once the RESET button on the Motherboard.
The DATA LED should start blinking indicating the
“Learning Mode”.
3. Type several random characters on the PC
keyboard. The Reader should recognize the serial
communication parameters, match them and display
them on screen, f.e. 19200, None, 8, 1.
4. Set the relevant Reader parameters accordingly
(refer to the RFID System S21 Reference Guide).
5. Send :CONFIG:STORE.
6. Push the RESET button again to exit “Learning
Mode”.
Problem Symptom Probable Cause Solution
2. Reader does not
record the
Transponder’s
messages.
2.1. After the
power-on test is
finished, the sign-
on message is
displayed on the
PC, but the
DATA LED is
flashing
continuously at a
random rate.
2.1.1. An improper carrier
threshold was set, or there
is an unwanted
transmission on the UHF
channel.
1. Check whether the Reader is receiving information
that is being transmitted from other Transponders in
its vicinity. If you eliminate the unwanted
transmission, the DATA LED will stop flickering.
2. Check whether an Exciter’s Test Tag is transmitting
(faulty board). Switch off the power supply of all
Exciters surrounding the Reader and monitor the
DATA LED. If the DATA LED stops flickering, the
unwanted transmission originated in one of the
Exciters.
3. Run the procedure, S21 RFID System - Final Test on
page 5-18. Step 2 - Set up the Carrier Threshold for
the Reader.
4. If the Reader reports a channel noise level below -
95dBm, but you are still not receiving the
Transponders’ messages, check the noise level
reported by the Reader with and without UHF
antennas connected. If the noise level is identical or
varies slightly (±1 dBm), replace the Reader.
5. If the Reader reports a noise level (HNL) above -95
dBm, there is unwanted transmission on the UHF
channel from an external jammer. For procedures on
eliminating the unwanted transmission, refer to
Chapter 4, Setup Guidelines in the RFID System S21
Technical Guide.
Problem Symptom Probable Cause Solution