Sending alarm using a modem and a Basic Stamp ( Please, Help)

Joe

Hi

I have post but it seems it was not at the right place.
So I am posting here.

I need to send messages using a GSM modem
and a basic stamp.

I need to know about the hardware I need
to have. I need comunication betwen
the Basic Stamp and the GSM modem.



I need Help, thanks: Joe

Chris Savage

This thread is being moved from the·Completed Projects·Forum to the·BASIC Stamp·Forum.

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Chris Savage
Parallax Tech Support
csavage@parallax.com

Franklin

What input does the modem have? RS232 or TTL levels? what does it want for an input string or does it use codes? Help us help you.

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- Stephen

Joe

Yes,

The modem has RS232.

That is the PDF:

http://www.premierwirelesssolutions.net/pdf/GM28.pdf

My problem is about the hardware that I need to
send mesages.

I have done some tests using a homework Stamp and the modem
but I am not sure about the hardaware.

Do you have some information?

Thanks, Joe

Franklin

Did it work for you using the homework stamp? If so you will need a power source, voltage regulator and probably an rs232 to ttl converter(and the stamp). I didn't read the whole PDF but This would get you started.

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- Stephen

Joe

Hi,

The modem has worked with the homework board.

But sometimes the modems doesn't send messages.
( It is not 100 % reliable, it is about 70 % reliable)

The Homework board has power source and voltage regulator.

And the modem has its own power source and regulator.

I don't understand if I need a converter.
Do you know if Parallax sells a converter rs232 to TTL ?

Thanks, Joe