Failure Modes
No Communication
To determine if there is a problem in the communications hardware, the following two commands should
be repeated together for testing purposes:
!01
escape to diagnostic mode
!22
display time and date
If functioning properly, the time and date will be displayed after the second command, which means that
the reader is communicating. If the reader is not functioning properly, then perform the following checks.
•
Verify that the AI1422E Reader System has adequate power. It should have
24 VDC ±0.5 VDC.
•
Verify that the main power switch is on.
•
Verify that the main power light-emitting diode (LED) is illuminated.
•
Verify that you are using a null modem cable connection.
•
Verify that the Interface Selection switch on the front panel of the reader is set to the
correct interface.
•
Verify that the baud rate is set correctly. If an incorrect baud rate is suspected, select and
send each baud rate in turn, using the
!100X Baud Rate Select
command, and wait
for a response.
Unit Will Not Read Tags
The suggestions listed here assume that the user has already verified proper serial communications. If
RF POWER LED is illuminated, the indication is that the AI1422E is querying for tags. If the LOCK LED is
illuminated, the indication is that the reader system is retrieving tag data. If neither of the LED indicators
are illuminated, check the following items:
•
Verify that the antenna connection is good.
•
Verify that the antenna cable is in good condition.
•
Verify that a single, known valid tag, properly polarized, is in the antenna field.
•
Verify that the trigger remains activated and the unit power is on.
•
Verify that a tag is being alternated with another tag containing different data to avoid
uniqueness filtering.
Chapter 7 Troubleshooting and Maintenance
TransCore Proprietary
7–51