12
Wireless Tag Reader Installation Guide
Verifying Operation
To verify WTR operations and wiring, see Table 2 on page 11.
Low Power Mode
If main power fails the WTR enterd low power mode. Low power mode is indicated by
the following:
•
The green LED remains off,
– and –
•
The red LED flashes approximately once every 1.5 seconds.
In low power mode the WTR does not generate a LF Field. The WTR transmits a
“Device in Low Power Mode” message to the network approximately once every 12 sec-
onds.
The WTR remains in this mode until main power is restored or until reserve power is
exhausted. Reserve power should last for at least 15 minutes. When main power is
restored, the WTR returns to normal operation.
Troubleshooting
When the WTR detects an error condition, the following occurs:
•
An error message is transmitted to the network,
– and –
•
The red LED flashes in a repeating pattern of 12 short flashes and one long flash,
– and –
•
The buzzer sounds every 12 flashes.
The WTR may enter an error state for any one of three reasons:
•
An invalid combination of configuration switches has been set. For example,
setting the Mode Switches to
ON
,
ON
,
OFF
or
ON
,
ON
,
ON
causes an error.
•
The EOL input is not returning the correct measured value. This could be treated
as a tamper alarm. If it is not a tamper alarm, then correct the EOL resistor value
or move DIP Switch 1 on the Options DIP switch to
OFF
. See Figure 6 on
page 8 for the location of DIP Switch 1.
•
The main supply voltage is low. If the WTR can still function with the low
supply voltage the device will continue to report tags while in the error state. If
the voltage supply is so low that the WTR cannot function, it will enter the Low
Power Mode which is described in the preceding text.
In each of the three error states, the WTR transmits a network message that indicates
which of the three causes is responsible.