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Transponder
Status LEDs
Each Transponder contains LEDs that display the transponder's condition and its response to events. With the
exception of the AC Power LED (which is located in the lower right hand corner of the transponder circuit board),
the diagnostic LEDs are located in the top right corner of the transponder board.
Generally, the LEDs indicate the unit's status and signal system events. Each LED and its function is indicated
below:
LED
AC Power
Comm Fail
Carrier Detect
Transmit Data
Receive Data
CRC Error
Test in Progress
Alarm in Progress
Heartbeat
Function
(Lower right hand corner of the transponder board.) If this LED is off there is no AC
power (Mains power) to the board. Find and correct the AC power (Mains power)
problem. This LED will light even if the transponder's power switch is off.
This LED will light if the transponder is in a communications failure condition with the
Central Station. It will automatically go out when communications are restored.
This LED is operational only for SE485 communications. It will flash on every time any
transponder (including this transponder) on this SE485 bus sends a message to the
Central Station. It is used to monitor overall communications from the transponders to
the Central Station. If the Carrier Detect LED stays on there is a problem with one of
the transponders on this bus or the wiring that must be corrected before normal
communications will be restored.
This LED will flash on every time this transponder sends a message to the Central
Station, whether or not the Central Station receives it. If this transponder initiated the
communications and the Central Station correctly receives the message the Receive
Data LED should flash soon thereafter indicating that the Central Station successfully
returned an acknowledgement.
This LED will flash on every time this transponder successfully receives a message
addressed to it from the Central Station. If the Central Station initiated the
communications the Transmit Data LED should flash soon thereafter indicating that this
transponder is returning an acknowledgement.
This LED will come on every time a message is received containing errors, whether or
not it was addressed to this transponder. The LED will remain on until the next
message addressed to this transponder is received without error. The most common
cause for this LED to turn on is wiring errors. Verify that the SE485 TX+ and TX- are on
a twisted pair. Also verify that the SE485 RX+ and RX - are on a twisted pair.
This LED comes on whenever a transmitter has been tested. It will stay on for the
duration of the test display, typically 5 to 10 seconds, then it will go out. If a test is
received while another test is in progress, the Test in Progress LED will go out
momentarily then come on for the duration of the second test.
This LED comes on whenever a transmitter is in alarm. It will stay on for the duration of
the transponder's involvement in the alarm, then it will go out. If an alarm is received
while another alarm is in progress, the Alarm in Progress LED will go out momentarily
then will stay on as long as any alarms are active in the transponder. An alarm that
causes the receiver sounders to stay on will keep the Alarm in Progress LED to remain
on. Silent alarms or alarms from unauthorized transmitters will cause the Alarm in
Progress LED to turn on and to go out when the Central Station acknowledges the
alarm message. This will also occur for every alarm follower message. A maintenance
alarm message will cause the Alarm in Progress LED to come on for 5 to 10 seconds
then to automatically go off.
Flashes at a fixed rate to indicate that the microprocessor is operating normally. If this
LED stops flashing, the transponder is not operational. Turn it off using the power
switch for five seconds. Then turn it back on. If the LED does not flash the transponder
should have the AC power and the back up battery disconnected wait a few seconds
and then connect back up. If the LED does not flash at this time, the transponder
should be replaced.
Security Escort Training
Page 67 of 142
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