GSM LT-1
SATEL
3
Figure 1. Hooking up the module to telephone line.
2. L
IMITATIONS OF USE
As the mobile phones are designed for the maximum efficiency of speech conveyance,
the data compression feature which is used in them brings about distortions in the
transmitted audio signals, which may make difficult or even impossible sending modem
signals through a simulated telephone line (downloading, monitoring).
3. D
ESCRIPTION OF THE MODULE
MODULE TERMINALS:
+12V
– power supply input (12 V DC ±15%)
GND
– ground (0 V)
FLT
– alarm output, GSM telephone failure or insufficient range (OC; 50 mA)
R-1, T-1
– extension telephone line (connection to the alarm control panel or to a telephone
set)
The
FLT
output is a generalized fault indicator. It gets active if connection with the base
station is not confirmed by the module within 10 minutes. It may be caused by a telephone
trouble, antenna failure (antenna cable damage), or loss of range due to other reasons.
The fault alarm stops maximum 30 seconds after the alarm causes ceased to exist.
