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RS232 Propeller — Parallax Forums

RS232 Propeller

ProcessingData...ProcessingData... Posts: 208
edited 2011-04-13 05:34 in Propeller 1
I am trying to connect a RS232 Serial Port to my propeller, but as of right now, it is not working.
I have 10k Ohm Resistors on the TX, RX, and RESn lines, but they might need to be pulled up (or down).
Below is the schematic of how it looks right now.
Can anyone confirm whether or not I need to pull the lines high or low?
serial.png
serial.png
300 x 300 - 42K

Comments

  • Duane DegnDuane Degn Posts: 10,588
    edited 2011-04-12 14:34
    Do you want to use RS232 to Program the Prop?
    If so, there's a schematic in the datasheet (you can find it in the Prop Tool's help menu).
    I'm pretty sure you'll need some transistors.

    Edit: The schematic is on page 5 of the datasheet.
  • LeonLeon Posts: 7,620
    edited 2011-04-12 14:36
    Use a MAX 3232.
  • ProcessingData...ProcessingData... Posts: 208
    edited 2011-04-12 15:16
    Duane Degn wrote: »
    Do you want to use RS232 to Program the Prop?
    If so, there's a schematic in the datasheet (you can find it in the Prop Tool's help menu).
    I'm pretty sure you'll need some transistors.

    Edit: The schematic is on page 5 of the datasheet.

    Yes, that is the idea.
    Thank you for the schematic.
    I looked at it, and am wondering if there is any way to do it with less components...?
  • JonnyMacJonnyMac Posts: 9,233
    edited 2011-04-12 18:20
    I looked at it, and am wondering if there is any way to do it with less components...?

    Probably not. The signals coming in and out must be inverted as the Propeller uses True mode comms for downloading. You could save yourself a lot of trouble buying a Propeller Plug. Sure, you can buy the parts to build a simple adapter for less, but then you have to put it together.
  • UnsoundcodeUnsoundcode Posts: 1,532
    edited 2011-04-13 05:34
    Hi, after looking at the links suggested you might have realized that the schematic in the original post is wrong. Just in case you missed it.

    Pin 2 is TX to P31 ,Pin 3 is RX to P30 and Pin 4 is RTS

    Jeff T.
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