View Full Version : Transmitting serial data

09-04-2008, 09:24 AM
I have a friend who has a security system and a panel that sends and receives serial data from the keypad via two serial channels- One for sending and one for receiving data. Is there a Parallax product that can be used with an external power source to transmit and receive the serial data between the panel and the keypad? The wiring is

I'm not new at basic stamp, but i am new at the LCD AppMod

Mike Green
09-04-2008, 10:49 AM
The only products that Parallax has for RF serial communications are here: www.parallax.com/Store/Accessories/Communication/tabid/161/CategoryID/36/List/0/Level/a/catpageindex/1/Default.aspx?SortField=ProductName%2cProductName (http://www.parallax.com/Store/Accessories/Communication/tabid/161/CategoryID/36/List/0/Level/a/catpageindex/1/Default.aspx?SortField=ProductName%2cProductName).

Whether they'd work in your situation depends on the Baud used by the keypad and perhaps the format of the information. If you're willing to build something more complicated, but maybe more reliable and secure, you could use xBee or Bluetooth. You'd need some kind of controller at each end to manage the xBee or Bluetooth link initialization and to possibly convert from the Baud used by the xBee or Bluetooth adapter and that needed by the keypad and panel. A Stamp at each end could do this. Other microcontrollers would work as well.

The Bluetooth transceiver is here: www.parallax.com/Store/Microcontrollers/BASICStampModules/tabid/134/txtSearch/eb500/List/1/ProductID/41/Default.aspx?SortField=ProductName%2cProductName (http://www.parallax.com/Store/Microcontrollers/BASICStampModules/tabid/134/txtSearch/eb500/List/1/ProductID/41/Default.aspx?SortField=ProductName%2cProductName).
Take a look at the manual for instructions in establishing a link from one module to another using Stamps to manage the link. Bluetooth has the advantage in that it can encrypt the link information.

Post Edited (Mike Green) : 9/4/2008 3:57:35 AM GMT