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1. Introduction
The G2S-T module allows easy control of any device by a NO (normally-open) relay contact. It
can be used to control, for example, barrier gates, overhead doors and similar devices via a
mobile phone. The maximum relay contact load is 240V/2A. In addition, in the temperature
monitoring mode, the module can monitor two temperatures using the resistance thermometers
connected to its inputs IN1 and IN2. When the set temperature is exceeded, the module can
drop-call (just ring and then hang up) the selected group of users or send them the alarm SMSs.
The module is intended for indoor use where it will not be exposed to limit temperatures and
humidity. To control the module output, the GSM communication is used. There are similar rules
for using the module like for common mobile phones. The connected device is controlled only
by ringing, so no call is charged and only the minimum credit is required on the inserted SIM
card. When the module is used to monitoring the temperatures and the option for sending the
alarm SMSs is set, these are charged according to the tariff of the mobile operator used. In any
case, it is necessary to ensure the validity of the SIM card credit or select a tariff without a time
limit in accordance with the operator's conditions. In the place of use of the GSM module, there
must be sufficiently strong signal of the corresponding GSM network. This can be verified on the
spot by making a call from a mobile phone. If such a call can be made, the signal is sufficient to
operate the G2S-T module, too.
2. Description of the G2S-T Module
The module, including the backup battery (accumulator) 3.6V/600mAh, is built in a plastic box
with dimensions approx. 115 x 67 x 28 mm. On the front side, it is equipped with connectors for
the power supply, inputs IN1, IN2 for connecting the thermometers and output of the relay NO
contact. On the opposite side there is an SMA connector for GSM antenna and on the side of
the box there is a USB connector for computer connection and a SIM card slot. The indicating
LED is located on the top of the box.
The supply includes the 230V/50Hz power supply adapter with the output voltage of 12V/1A,
two 10kΩ temperature sensors (ß = 3435), USB cable and disc containing the software and
manual. Up to 16 user numbers can be stored in the module's memory. These users can control
the connected device via their mobile phones, or, if the set temperature limits are exceeded,
they will get a drop-call (ring) or receive an alarm SMS. The phone numbers of the authorized
users can be entered into the G2S-T module from PC using the USBCommunicator utility
software, numbers in positions 0 to 9 can also be transferred to the module using the SIM card
prepared in the mobile phone.
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