Universal GSM communicator Jablotron GD-04 DAVID

Typical use:

• Automatic sending of SMS message when the input with GND terminal is switched on (or off). Each input terminal (A to D) can be configured with message texts and up to 8 phone numbers to which the event is reported. In addition, the text message can be highlighted by a follow-up call to the phones to which the SMS was sent.
• Switch controlled by SMS messages. You can set your own texts to turn each contact on and off.
• A time switch that can be activated remotely by mobile phone (the switch-on time can be set from 1s to 10h).
• Relay switched by ringing the phone. Each relay can be configured with up to 50 phone numbers to which it will respond. Ring control is free on the GSM network (David does not answer incoming calls, he only monitors who is calling and if it is a legitimate number, activates the relay on the first ring). This is useful e.g. for opening parking gates etc.
• Relay switched by ringing from the phone with limited number of uses. A limit can be set when an authorised number is entered and once this limit is exceeded David ignores calls from this number. This is useful e.g. for subscription to a certain service (e.g. number of times a car park is used etc.). Further access can be enabled remotely (by SMS command) by the administrator.