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<blockquote data-quote="f0ster" data-source="post: 4045686" data-attributes="member: 66372"><p>I have what you are looking for, it is a gsm unit that has two digital inputs and one relay output, it runs off anything (ac or dc) up to 30v, with the digital inputs you have a pair of contacts that when closed by a sensor/detector or a switch of some sort it sends a text message to however many phone numbers you want (up to 500) it has two sets of digital inputs and each one can have its own unique message. the relay output is a relay with a set of change over contacts, n/o, n/c,</p><p>when you phone the gsm it checks the phone number to make sure it is its phone book and if it is it hangs up (free phone call) and operates the relay for a preset amount of time which can be altered to suit circumstances. the programming of the device can be done from anywhere in the world via text message. it has lots more functions but these are the basic ones described. we install them on biomass boilers so that the dairy farmer knows directly when the boiler has a fault instead of when everything has gone cold. it operates off a payg sim and to stop people like voda fone from switching it off and stealing your money due to lack of use it has a keep alive function by sending a text every few weeks. another function is the fact that any mobile can be tracked as long as it is in signal range.</p></blockquote><p></p>
[QUOTE="f0ster, post: 4045686, member: 66372"] I have what you are looking for, it is a gsm unit that has two digital inputs and one relay output, it runs off anything (ac or dc) up to 30v, with the digital inputs you have a pair of contacts that when closed by a sensor/detector or a switch of some sort it sends a text message to however many phone numbers you want (up to 500) it has two sets of digital inputs and each one can have its own unique message. the relay output is a relay with a set of change over contacts, n/o, n/c, when you phone the gsm it checks the phone number to make sure it is its phone book and if it is it hangs up (free phone call) and operates the relay for a preset amount of time which can be altered to suit circumstances. the programming of the device can be done from anywhere in the world via text message. it has lots more functions but these are the basic ones described. we install them on biomass boilers so that the dairy farmer knows directly when the boiler has a fault instead of when everything has gone cold. it operates off a payg sim and to stop people like voda fone from switching it off and stealing your money due to lack of use it has a keep alive function by sending a text every few weeks. another function is the fact that any mobile can be tracked as long as it is in signal range. [/QUOTE]
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