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The SGRDA is a low cost wireless remote system that provides personal emergency alerting for people in a variety of workplace environments including remote or isolated areas.
The system consists of a battery powered personal key-fob, and a vehicle powered base station that can be connected to a GPS based Automated Vehicle Location (AVL) unit or other alerting system. The key-fob is light enough to be carried on a lanyard around the neck or carried in a shirt pocket.
If a situation arises where the person requires urgent assistance, they can depress the alert button on the key-fob to send an RF signal to the base station in the vehicle that can be up to 500 metres away. The base station then activates an input on the AVL that in turn transmits an urgent alert signal containing critical information like identification, time, and location to a remote monitoring service. The monitoring service then displays the alert on a map for local operators. The service can also send a text or email message to support personnel or dial specified phones and play a text to voice message.
The SGRDA fob has two push buttons, RED for alert and the smaller BLUE for cancel. The buttons are low profile to prevent being accidently knocked or depressed. When the base station receives the coded alert signal from the fob it latches a contact output and holds the latch for half a second.
The contact output can be connected to an AVL (Automated Vehicle Location) device via a digital input. When the input changes to the alert state, the AVL unit can generate an alert message with time and location data, and then transmit that message to the monitoring service. It is recommended that a transmit delay of 10 seconds be programed in the AVL unit in case it receives a cancel from the key-fob.
The SGRDA can come with a built in vibrator that provides confirmation back to the holder that a message has been sent to the monitoring station. The base station generates this confirmation after it has activated the Alert Output.
The system can also be set up to provide an “I am OK” response from the key-fob holder. This can be achieved by connecting a digital output from the AVL unit to the vehicle horn or other sounder. The AVL can be programmed to set off the horn on a set period, say an hour, and when the key-fob holder hears the horn they will have another set period to press the Cancel button on the key-fob. If the AVL unit does not get the Cancel signal after a couple of retries then it will send an alert message to the monitoring server.
