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  • AllenCherry's Avatar
    08-14-2019, 06:33 PM
    Hi Paul, Just to let you know that I used a DSD TECH USB to TTL Serial Adapter purchased from Amazon - two pieces for 8.99. I figured that I would have to have a USB plug and lead going from the computer to the...
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 02:51 PM
    Thanks Paul, The MAX232 is definitely the most robust way forward. I have ordered a couple, and will wire them in tomorrow. I'll let you know how I get on. Very much appreciate your help, Allen
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 11:16 AM
    Many thanks for a possible solution - is the 'SERIAL_8N1_RXINV_TXINV' the correct syntax to use for the UART inverse polarity? Best wishes, Allen
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 11:02 AM
    Hi Paul, I think that you have found the problem - Pin 2 on the USB - Serial convertor is sitting at -5 volts! So does that mean I will have to incorporate the MAX232 to drive the RX1 / TX1 serial port on the...
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 10:47 AM
    Hi Paul, Yes, it is a 'standard' 9-pin 'D' connector, but the RS2332 from the USB to Serial convertor is only giving TTL signal levels of 5 volts. I am using the Teensy 3.5, so it is 5 volt tolerant, hence I don't...
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 10:23 AM
    It looks as though the upload of the photo has worked! The pink and white wires are the TX1 and RX1 from the Teensy (1 and 0) to the 9 pin 'D' connector, pins 2 and 3, the black wire is the ground to pin 5 on the 'D'...
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 10:16 AM
    Dear Paul, Many thanks for your prompt response. I have double-checked the grounds, and also used a 'Null Modem' convertor to reverse the TX / RX connections. With the connections 'reversed', I get no output at...
    13 replies | 95 view(s)
  • AllenCherry's Avatar
    08-12-2019, 09:14 AM
    Anyone who can help a 'Newbie'? I am using the 'Echo Both' example code for serial testing on the Teensy 3.5 board, with a USB to serial convertor lead from another computer which has RX, TX and ground connected to...
    13 replies | 95 view(s)
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USB - Serial Problems 08-14-2019 06:33 PM
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