User's Manual

General Guidelines
7-6 Troubleshooting
3. Reader does not
record all transmitted
messages.
3.1. Reader does
not record all
transmitted
messages by the
Transponder.
3.1.1. The receiving zone
is too small because of
either a high carrier
threshold, or there is
random interference on
the UHF channel.
1. Run the procedure, S21 RFID System - Final Test on
page 5-18. Step 2 - Set up the Carrier Threshold for
the Reader.
2. If you observe a random variation of noise and
interference on the UHF channel, either increase the
value of the
RSS parameter, or set the HTL
parameter to a higher value than the one that was
automatically set by the Reader.
3. If the receiving zone is too small after you set a
higher carrier threshold, follow the setup guidelines
recommended in Chapter 4, Setup Guidelines in the
RFID System S21 Technical Guide.
Note
A UHF channel is subject to random noise and
interference. The Reader disregards the messages with
data errors. For an optimal channel, free of interference
and industrial noise, the Reader must be able to receive
all messages transmitted by a single Transponder
placed in its reading range. When using multiple
Transponders, some messages are lost due to the
inherent collision between them.
4. Time-out error. At
the command
:TEST:EXCITER k,
the response is 00,
but the Main PC does
not receive a correct
message from the
Test Tag of the
Exciter k after a
predetermined period
of time.
4.1. DATA LED
is flickering, the
Reader’s Tag
Record Buffer
contains
messages from
the Test Tag.
4.1.1. User data in the Test
tag was incorrectly
programmed.
1. Query the Test Tag programming parameters using
:TAG:QUERY:EXCITER k.
2. Check the user data (TUD).
3. Correct the user data (WUD).
4. Reprogram the Test Tag using the command
:TAG:MATCH:EXCITER k.
4.2. DATA LED
is flickering, but
the Reader’s Tag
Record Buffer is
empty.
4.2.1. Test tag was
incorrectly programmed.
1. Query the Test Tag programming parameters using
:TAG:QUERY:EXCITER k.
2. Check the value of all group T parameters.
3. Correct the values using the group W parameters.
4. Reprogram the Test Tag using the command
:TAG:MATCH:EXCITER k.
Problem Symptom Probable Cause Solution