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Thread: 9-pin serial port

  1. #1
    CloudedVision Newbie
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    Default 9-pin serial port

    I am making a project with a microcontroller that interfaces to the computer via a 9-pin serial cable. Can I get a 9-pin serial port that attaches to a solderless breadboard anywhere?


  2. #2
    gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent
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    Surely can,



    You dont need the majority of the pins if your only using the connector for UART


    • Pin 2 - RX data for PC
    • Pin 3 - TX data from PC
    • Pin 5 - Common Earth

    Last edited by gramo; 15th November 2008 at 11:10 PM.

  3. #3
    gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent
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    Forgot to mention that you can get them from Futurlec

    D-Subminiature Connectors


    ~$0.52

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    CloudedVision Newbie
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    Thanks gramo. That's exactly what I needed.

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    CloudedVision Newbie
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    Wait, another question. You were right, I only needed pins 1-5, but the manual of my microcontroller says I need to directly connect pin 6 (DSR) to pin 7 (RTS) Do I need to do this? If I do, the parts from futurlec look like it only includes pins 1-5, so that won't work.

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    gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent gramo Excellent
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    Quote Originally Posted by CloudedVision View Post
    the parts from futurlec look like it only includes pins 1-5, so that won't work.
    The PCB adapters from Futurlec do include all 9 pins, the angle of the photo is bad.

    Quote Originally Posted by CloudedVision View Post
    the manual of my microcontroller says I need to directly connect pin 6 (DSR) to pin 7 (RTS) Do I need to do this?
    Depending on the application (and the programming involved), generally you don't require the other pins.. Consider this project I did a while ago: Spency's digital-diy 16F PIC micro Tutorial - DS275

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    thanks for clearing that up gramo

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