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Bus 0 – 7
Verifying Communications
To verify communications press the test feature on any transmitter. The Test in Progress LED will come on. If it
did not come on the receivers are not communicating with the transponder. About a second after the Test in
Progress LED comes on the Transmit Data LED will flash on (indicating that the transponder is sending the test
message to the Central Station). Less than a second later the Receive Data LED will flash (indicating the Central
Station returned an acknowledgement).
Toggling the transponder's tamper switch on/off will cause the Transmit Data LED to flash on (indicating that the
transponder is sending the tamper message to the Central Station). Less than a second later the Receive Data
LED will flash (indicating the Central Station returned an acknowledgement).
Normally these LEDs will be on if the corresponding Bus Enable jumper is in place, and
will be off if the jumper is removed. If the bus is enabled, the LED will flash off and
come back on, every time a receiver or alert module on that bus communicates with the
transponder. A bus LED will flash at the rate of the heartbeat LED if there is any kind of
bus fault (data to ground, data to power and bus power to ground) on that bus. On the
EA501 the communications failure LED will flash at this rate since there is no Bus LED.
A Bus LED will flash at ½ the rate of the heartbeat LED if there are no points reporting
on that bus (open connection). On the EA501 the communications failure LED will flash
at this rate. If a Bus LED is flashing for a bus that is not enabled, it can be reset in the
Central Station's Transponder Data View dialog by selecting this transponder and
clicking the Clear EE button. There are two special displays on the bus LEDs. All the
Bus LEDs go out, and for 2 seconds a single LED is on walking down the display from
Bus 0 to Bus 7 indicates that a battery test is in progress. Usually after the tamper
switch is released the Bus LEDs count rapidly to indicate that the EEPROM memory is
being updated.
Security Escort Training
Page 68 of 142
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