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Thread: Teemsy to Teensy 3.1, 3.6, 4, 4.1 TX, RX, CTS, RTS, HWFC

  1. #1
    Senior Member
    Join Date
    Jan 2014
    Posts
    181

    Teemsy to Teensy 3.1, 3.6, 4, 4.1 TX, RX, CTS, RTS, HWFC

    I have seen various postings, and find them inconsistent.

    Teensy Transmit
    Serial1.begin(921600); // this works with a BLE module with RTS and CTS going to BLE RTS and CTS
    Serial1.attachCts(18);
    Serial1.attachRts(19);

    Teensy Receive
    Serial1.begin(921600); // this works with a BLE module with RTS and CTS going to BLE RTS and CTS
    Serial1.attachCts(18);
    Serial1.attachRts(19);

    Connections:
    Teensy Transmit Teensy Receive
    pin 0 pin 1
    pin 1 pin 0

    which of these is correct A, B or C or other?

    A. Teensy Transmit Teensy Receive
    pin 18 pin 18
    pin 19 pin 19

    B. Teensy Transmit Teensy Receive
    pin 18 pin 19
    pin 19 pin 18

    C. Teensy Transmit Teensy Receive
    pin 19 pin 18
    pin 18 pin 19


    thanks,

    Richard

  2. #2
    Senior Member
    Join Date
    Apr 2020
    Location
    DFW area in Texas
    Posts
    244
    @RichardFerraro:

    Going on the assumption that the RTS/CTS convention is being used/followed (RTS as an output & CTS as an input), you should connect pin 19 (RTS) on each Teensy to pin 18 (CTS) on the other Teensy. I believe that this would result in both Choice "B" and Choice "C" being correct, as you have them listed.

    Mark J Culross
    KD5RXT

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