User
Manual
GSM-4S
4
PHONE – jack for extension telephone line
+ 12V
– power supply input
GND
– ground (0 V)
+V
– power output (12 V; max. 300 mA)
-V
– ground (0 V)
SM2
– socket for the SM-2 voice synthesizer
IN1–IN4 – the
module’s
inputs
OT1–OT3 – the controlling output (OC)
OT4
– output (OC) for signaling the failure of telephone line and/or SIM300CZ
telephone
Note: The OT3 output can play the role of a telephone line trouble indicator – settings
option.
The figure 2 shows the arrangement of terminals and essential elements, which are important
for connecting and programming the GSM-4S module.
For power supply of external equipment you should use the +V & -V outputs, whose max.
current load must not exceed 300 mA. It should be borne in mind, that the capacity of
connected power supply unit must be adequate for power demand of the module and the
devices connected to it.
+12V
EXTERNAL POWER
SUPPLY SOCKET
TELEPHONE
JACKS
LCD display
PHONE LINE
T-1 R-1 TIP RING
CHANGE
ESC
NEXT
SM2
EXTERNAL ANTENNA CONNECTOR
OT1 OT2 OT3 OT4 +V IN1 IN2 IN3 IN4 -V +12 GND
SIM300C telephone
SIM CARD SOCKET
SM-2 SPEECH SYNTHE-
SIZER CONNECTOR
RS 232
INTERFACE
BUZZER
Figure 2.View of GSM-4S module board.
