These devices use GSM Technology to monitor Remote signals. This could be to change an output condition of the device based on a message or input level, or maybe to report alarm status of the input being monitored.
GPRS Enabled Data Logging/Data Acquisition unit, with 2 modes of operation: E-mail recorded data or transmit data (using Modbus Protocol) via GPRS to a server running monitoring software. Also has 6 Digital Inputs, 2 Digital Outputs, 1 Analogue Input, 2 RS232 ports, 1 RS485 port and a GPS Receiver. For additional I/O points, up to 3 M-7000 ...