96
en | Troubleshooting transponders, points, receivers, and alert units
Security Escort
2017.08 | V2.18.1.0 | DOC
Training Manual
Robert Bosch (SEA) Pte Ltd
LED
Function
Comm Fail
This LED lights if the transponder is in a communications failure
condition with the Central Console. It automatically goes out when
communications are restored.
Carrier Detect
This LED is operational only for SE485 communications. It flashes
every time any transponder (including this transponder) on this
SE485 bus sends a message to the Central Console. It is used to
monitor overall communications from the transponders to the Central
Console. 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 are restored.
Transmit Data
This LED flashes every time this transponder sends a message to the
Central Console, whether or not the Central Console receives it. If
this transponder initiated the communications and the Central
Console correctly receives the message, the Receive Data LED should
flash soon after indicating the central station successfully returned an
acknowledgement.
Receive Data
This LED flashes every time this transponder successfully receives a
message addressed to it from the Central Console. If the Central
Console initiated the communications, the Transmit Data LED should
flash soon after indicating that this transponder is returning an
acknowledgement.
CRC Error
This LED comes on every time a message is received containing
errors, whether or not it was addressed to this transponder. The LED
remains 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.
Test in Progress
This LED comes on whenever a transmitter is tested. It stays on for
the duration of the test display, typically 5-sec. to 10-sec., then it goes
out. If a test is received while another test is in progress, the Test in
Progress LED goes out momentarily then comes on for the duration of
the second test.
Alarm in Progress
This LED comes on whenever a transmitter is in alarm. It stays on for
the duration of the transponder’s involvement in the alarm, then it
goes out. If an alarm is received while another alarm is in progress,
the Alarm in Progress LED goes out momentarily then stays on as long
as any alarms are active in the transponder. An alarm that causes the
receiver sounders to stay on keeps the Alarm in Progress LED on.
Silent alarms or alarms from unauthorized transmitters cause the
Alarm in Progress LED to turn on and to go out when the Central
Console acknowledges the alarm message. This also occurs for every
alarm follower message. A maintenance alarm message causes the
Alarm in Progress LED to come on for 5-sec. to 10-sec. then to
automatically go off.
