12
T
ROUBLE
LED
(#3)
Green
On
All 3 Output Relays Normal
Red
On
One or more Output Relay Off-Normal
GSM
C
OMM
LED
(#4)
On
Unit registered on the network
Green
Flashing
Waiting for an ACK from the Central Station
Red
On
Unit not registered or No Cellular Network
H
EARTBEAT
LED
(#5)
Green
Flashing
Unit is functioning normally
Red
Flashing
S1 is ON after reset
RSSI Mode: When the 2550 is placed in Received Signal Strength Indicator
(RSSI) Mode by turning Dipswitch S4 to ON, the five LEDs indicate the follow
signal strength information:
Received Signal Strength Appearance of LEDs (#1 thru #5)
≥
-40 dBm
●●●●●
#1:
green, solid
;
#2:
green, solid
;
#3:
green, solid
;
#4
:
green, solid
;
#5:
green, solid
≥
-50 dBm
○
●●●●
#1: off; #2:
green, solid;
#3:
green, solid
;
#4:
green, solid
;
#5:
green, solid
≥
-60 dBm
○○
●●●
#1: off; #2: off; #3:
green, solid
;
#4:
green, solid
;
#5:
green, solid
≥
-70 dBm
○○○
●●
#1: off; #2: off; #3: off; #4:
green, solid
;
#5:
green, solid
≥
-80 dBm
○○○○
●
#1: off; #2: off; #3: off; #4: off; #5:
green, solid
≥
-90 dBm
○○○○
☼
#1: off, #2: off; #3: off; #4: off; #5:
green, flash
≥
-110 dBm
○○○○
●
#1: off; #2: off; #3: off; #4: off; #5:
red, solid
≤
-111 dBm
○○○○
☼
#1: off, #2: off, #3: off, #4: off, #5:
red, flash
No signal
○○○○○
All OFF
