User Manual
GSM LT-1
4
Figure 2.
View of the GSM LT-1 module board.
In its active state, the FLT output is shorted to the ground. The FLT output may be connected
to the alarm control panel input, or it can directly control the relay operation (its maximum
current-carrying capacity is
50 mA
).
LEDs:
The module indicates its status to the user by means of 4 LED indicators. The mode of
lighting of the STAT and SIG LEDs depends on the module status and provides
the information described below. The lighting cycle of these LEDs is 4 seconds, repeated
after a 1-second pause.
STAT
– indicates the module status by a corresponding number of flashes with specified
duration. Shown symbolically below are single cycles of various LED lighting
modes with their meaning described. The shaded fields meaning the LED "on" and
the blank fields – the LED "off":
– (LED off) module power off
– no PIN code
– wrong PIN code
– PUK code required
– no communication with GSM telephone
– active connection
– normal operation of module
– module restart on switching power on
– PH-SIM PIN code required
– no SIM card
– SIM card damaged
EXTERNAL ANTENNA CONNECTOR
+12V GND FLT R-1 T-1 RS-232
SIM
STAT
SIG
TX
RX
RS 232 INTERFACE
SIM CARD SOCKET
GSM telephone
