GSM Remote Switch




A GSM/GPRS modem comes as a handy solution for monitoring and non real-time control applications. Today mobile networks are widely available and this has enabled use of modems across multiple applications. This GSM/GPRS modem can be used in various applications such as elevator monitoring, production monitoring etc. It can be easily integrated with existing embedded applications over serial port and with very easy serial AT command set.

RS 232 serial, up to 115Kbaud speed
Based on Quectel M95 Quad band module20141211_172010
Frequency band: 850/900/1800/1900MHz
Note: Two power supply options available on request
1) 5V to 12V
2) 7V to 24V


In many cases, it is required to add wireless interface to your existing instrument. But if the instrument is supplied by some third party, it may not be possible to add AT commands to such a device. This is true with PLCs, HMI, Data loggers that send data in custom format or over MODBUS. In such case, auto-modem can act as MODBUS host. This modem will retrieve data from the instrument and will send over wireless channel using SMS or GPRS.

No need to write AT commands (modem internally manages AT commands)
Built-in 20KByte RAM for temparay data storage
Built-in 256KByte FLASH for saving data / settings permanantly
Built-in RTC to keep track of date and time
Sends data when strongest signal strength is available
Can send data using SMS / Email / TCP-IP
Destination address can be permanantly saved in modem itself
Modem acts as MODBUS host
RS232 and RS485 half duplex interface available
RS485 can address upto 50 devices (in round robbin fashion)
5 to 12V power supply
Very compact form factor (same as regular modem)




Analog Input 8 Channels, 10bit/12bit.
Serial Interface 1 UART channel
Memory Micro SD card (upto 8GB)
Interface Serial (UART) And USB
Digital IO UPTO 40
RTC RTC clock on-board
Display Provision For LCD/GLCD/TFT.
Power Supply 12V DC.
GSM Quad-band (850/900/1800/1900MHz)
GPRS Multi-slot Class CLASS 12, Max. 85.6 kbps (uplink & downlink)
SMS Point-to-point MO and MTSMS Cell BroadcastText and PDU Mode