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LED Indications
The 7835C has two sets of LED displays: Radio Status LEDs and a multi-function bar graph.
Radio Status:
GRN
RADIO STATUS
YEL
LEDs
RED
SIGNAL STRENGTH
(RSSI) BAR GRAPH
LED Displays
Bar Graph Indications
Signal Strength:
Power-Up:
Registration:
Transmit Error:
YEL
GRN
GRN
INCREASING SIGNAL STRENGTH
Signal Strength Bar Graph
PATTERN
Solid
Rapid chaser
From left to right, one or more LEDs are
lit, with the leading LED either solid or
blinking.
Yellow LED not lit, green LEDs
sequentially being lit from right to left –
counting down.
Yellow is blinking, green LEDs
sequentially being lit from right to left –
counting down.
Flash in unison
Green, yellow, and red LEDs, which provide information on pending messages,
successful or unsuccessful message transmission, network connectivity, and
registration status. Refer to Table 6 below.
LED
PATTERN
Green
Flash
Solid
Yellow
Solid
Flash rapidly, continuous
Flash, once per sec
Flash, twice per sec
Red
Solid
Periodic flash
Flash rapidly, continuously
Flash rapidly, briefly
All
Solid
Rapid chaser
Slow chaser
Slow flash in unison once
per second
Slow flash in unison twice
per second
Viewed with the cover removed (refer to Removing the Cover section),
this display consists of one yellow and four green LEDs arranged in a bar graph. It
indicates the signal strength at which the 7835C is receiving the local cell. The display
is intended as an installation aid for determining a suitable mounting location. Refer to
Selecting a Radio Installation Site section for an explanation of its use.
During power-up, the bar graph LEDs are used to monitor radio initialization, and is
read from right to left. Refer to the 7835C Initial Power-Up Sequence section for details.
The bar graph display also monitors the radio's registration progress. Refer to
Registering the Radio section for detailed information.
The bar graph LEDs also indicate failed message transmission error codes by the
number of lit segments. Refer to the Transmitting an Alarm paragraph on the next page
for details.
GRN
GRN
YELLOW
Initial Power-Up Display
Table 7. Bar Graph LED Indications
Table 6. Radio Status LED Indications
MEANING
With solid yellow, successful message transmission
With flashing yellow, network contact but radio is unregistered
Message pending
Waiting for message validation after successful transmission
Normal operation, connected to "B" side carrier
Normal operation, connected to "A" side carrier
No network contact / RF fault or alarm was not successfully
transmitted before the old alarm time expired
ECP mode only: loss of communication with control
RF fault (unsuccessful transmission) and ECP fault
Transmit error (refer to transmit error codes diagram on next
page)
Power on, LED Test
Power on reset condition
Program mode accessible, radio previously programmed
Program mode accessible, radio previously unprogrammed,
zone defaults
Program mode accessible, radio previously unprogrammed,
ECP defaults
GRN
YEL
GRN
GRN
GRN
OFF
MEANING
Power on, LED Test.
Power on reset condition.
Normal RSSI display. Refer to Figure 2 and "Selecting a Suitable Installation
Site" section for a description of this display.
Radio initial power-up sequence. This display will only be seen when the 7835C
is being powered up (refer to "Initial Power-Up" section).
Radio registration sequence. This display will only be seen when the 7835C is
being registered. Refer to Registering the Radio section.
Registration unsuccessful.
– 28 –
GRN
YEL
GRN
GRN
GRN
YELLOW
BLINKING
Radio Registration Display
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