With the growing importance of mobile communications, mobile computing location awareness is becoming a key feature for more and more products and services. A unique product from u-Blox is its new GPS-MS1E-AT, which can communicate with a GSM modem without the need for an external processor. This is because the software is embedded on the GPS module itself. Due to its small size, light weight and minimal power consumption the GPS-MS1E is an ideal candidate for location-based mobile products.
How it works
A typical application for fleet management, AVL or tracking requires position information and communication with a central office. The traditional set-up requires a GPS receiver, a GSM modem and an external controller. This controller reads positions from the GPS receiver and controls the modem. Incorporating the control of the GSM modem into a GPS receiver spares the extra processor, which simplifies the design and saves cost.
With the AT command interface for GPS receivers µ-blox offers an integrated control system for GSM modems. This control system is designed for autonomous operation. An external controller is not required but can be used for enhanced functionality. An external controller may communicate with the GPS receiver via a serial port with the SiRF binary protocol. The GSM modem is connected to the other serial port and is controlled through the GPS receiver. Minimal external wiring is necessary to get a fully functional system to send position information via GSM (SMS, data connection).
The GSM controller is event-driven. For each event an action and the data transmitted can be defined. Events (triggers) may be the output of the GPS engine (position, time) or an external signal.
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