![]() It has 3 LED indicators, for power, status, and network. It has working voltage ranging from 5 to 12V on DC jack, depending on the model. ![]() It has standard DC power jack, which can be powered from external power sources such as voltage adapters. It also consist of RS232 port for serial communication between the modem and computer, however we are not going to use in this project. Two for TX and RX (transmit and receive), another two pins for VCC and GND, which is common in all. It has four I/O pins depending on the model you choose. It is like a mobile phone without Screen and keypad. GSM modem is a hardware which accepts a valid SIM card (Subscriber Identity Module), basically any SIM will work, which supports GSM protocol and with a network subscription. ![]() The GSM protocol also allows transfer of packet data, such as GPRS and EDGE. In a nutshell full duplex communication means both the parties can send/receive data (or voice) simultaneously. It is the first digital protocol for mobile communication which is optimized for full duplex voice communication. ![]()
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August 2023
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