User's Manual

General Guidelines
7-2 Troubleshooting
Problem Symptom Probable Cause Solution
1. No communication
with a Reader.
1.1. Reader does
not respond to
any command.
1.1.1. Reader has an
incorrect address.
1. Check whether the Reader responds to commands
using different addresses, by typing the following:
@1 IVN<Enter>, @2 IVN<Enter>, @3
IVN
<Enter>. When a correct address is sent, the
Reader will respond with its version number.
2. If, by using a specific address, you are able to
communicate with Reader, use this address or
change the address to another value.
3. If after checking all possible addresses (up to 31),
you still cannot communicate with the Reader,
check Probable Cause 2.
1.1.2. Faulty
communication line
between the Reader and
PC.
1. Open the Reader’s enclosure and connect the PC
directly to the Reader using the RS-232
communication line. See Connecting the RS232
Communication Line on page 2-2.
2. Switch off the Reader’s power supply for at least 5
seconds, then perform the steps in the Reader’s
Power-up Sequence on page 5-4.
3. If the Reader performs the power-on test
successfully, press the RESET button once. Check
whether the DATA LED starts flashing at the rate of
2 Hz.
4. Press the RESET button again. Check whether the
DATA LED stops flashing.
5. Check whether the Reader is responding to local
commands by typing:
@r IVN, and pressing
<Enter>, where r is the Reader’s address. The
Reader must respond with its version number.
6. If you are able to communicate with the Reader
from the local PC, check the integrity of the
communication line between the Reader and the
main PC.
7. After fixing the communication line’s integrity,
reconfigure the RFID System S21 and check
whether the Reader can communicate with the PC.
8. If you cannot communicate with the Reader (Step
5), check Probable Cause 3.