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RF modules

littlerichlittlerich Posts: 27
edited 2007-10-17 15:01 in BASIC Stamp
I have a pair BS2P modules and would like to do a radio link.
Now there is the 433 or 912MHZ options from Parallax which look ok.

Terminology question:
Are these a RS232, TTL or UART style device?
I am a bit lost as to the definition behind these three terms.
Is it that one of the above would require MAX232 chip somewhere?

Oh yes, anyone tried them? Easy/hard, love them/hate them advice welcomed.

Thanks
Rich

Comments

  • MorrolanMorrolan Posts: 98
    edited 2007-10-17 12:55
    Have you read the manuals on the Parallax website? They include detailed descriptions of how to communicate using the modules, and include sample code.

    www.parallax.com/detail.asp?product_id=28180
    www.parallax.com/dl/docs/prod/rf/27980-ParallaxRFTransmit-v1.0.pdf
    www.parallax.com/dl/docs/prod/rf/27981-ParallaxRFReceive-v1.0.pdf

    Everyone I know that has used them has never had any problems, so it looks like reading the datasheets and manuals on the Parallax website will be your best bet. smilewinkgrin.gif

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    Post Edited (Morrolan) : 10/17/2007 12:59:58 PM GMT
  • stephenwagnerstephenwagner Posts: 147
    edited 2007-10-17 14:05
    Love them.

    I have·the transmitter and receiver set from Parallax. I use them to transmit serial data using SEROUT from a stamp directly to·the remotly mounted Parallax receiver and Parallax 4X20 display. Never missed·a beat.

    SJW
  • stephenwagnerstephenwagner Posts: 147
    edited 2007-10-17 14:06
    The 433MHz flavor.

    SJW
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-10-17 15:01
    Serial Protocol is used on these devices. Now Serial can be at RS-232 levels, which are +12/-12V and inverted. They can also be at TTL levels which is non-inverted 5V levels. A UART is a dedicated piece of hardware or software which handles the transmission and reception of serial data without tying up the host or main process. Many UARTs have a FIFO buffer, which allows them to handle 16 or so characters before the host controller needs to get the data. As Morrolan pointed out our documentations outlines our connections and code examples. Using these in any other application would involve knowing the details covered above. Take care.

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    Chris Savage
    Parallax Tech Support
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