Witura WT-9001 IP65 Spezifikationen PDF herunterladen (Seite 41)

For this project, there are use two adapter converter. The input voltage for the

both adapter is 240V analog current and the outlet voltage for the each one is 12V and

9V. The adapter 12V used for supply voltage to the circuit and the other adapter 9V is

use for supply voltage to the GSM modem. The purpose used adapter 12V is to supply

energy to electromagnetic lock and for the circuit controller. While the adapter 9V is to

supplied energy to GSM Modem.

Figure 3.3 Adapter AC to DC converter 12V and 9V

3.1.2.2 GSM Modem

A GSM modem is a specialized type of modem which accepts a SIM card, and

operates over a subscription to a mobile operator, just like a mobile phone. From the

mobile operator perspective, a GSM modem looks just like a mobile phone. When a

GSM modem is connected to a computer, this allows the computer to use the GSM

modem to communicate over the mobile network. While these GSM modems are most

frequently used to provide mobile internet connectivity, many of them can also be used

for sending and receiving SMS and MMS messages.

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Witura WT-9001 IP65 Spezifikationen Seite 41