Omni Instruments supplies a retrofit GPRS telemetry package which can be fitted to older trains which are not at present equipped with a real time remote telemetry system. This low cost modular system can be used to monitor critical voltages, services and status of relays, and doors etc.. The system sends the data in real time via GPRS to a server where the data is published to a web browser with real time mimic panel views and historic data stored in a database.
The system comprises of a GPRS enabled data logger which can monitor up to 100 parameters via distributed acquisition modules running on an RS485 data bus. Modules are available for measurement of temperature sensors, voltage, current, digital state, and pulse counting.
The logger continuously scans all input channels and sends a reading from each channel every 5-10 seconds. Should the connection be lost, for instance when a train is going through a tunnel, up to 50,000 readings can be stored in a buffer. Once the connection is re-established the unit will immediately send the real time data and also send the stored readings over a period of a few minutes. All the data is stored in a MySQL database on a secure server, and is published to a web browser interface.
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