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2981Re: [Raspberry_Pi_4-Ham_RADIO] RS232 to Pi

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  • John Guillory
    Mar 26 6:10 AM
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      Uh, I'm not really sure how well this would work, but first off what I remember of the GPIO pins there is only 1 serial port.  However, what is to stop you from using the serial port wired to a couple of max232s and using a couple of GPIO data pins for select lines to control which of the two you want to use?  This way the only real limit on ports would be the speed of the Pi to be able to switch serial ports and not loose data.  Which means the faster the baud rate, the less serial ports you could use, if this method would even work.

      John Guillory
      Cell: 601-754-9233
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      On Mar 25, 2014, at 10:36 AM, Max Harper <kg4pid@...> wrote:


      I'm not so sure that the information at the given link is correct. In all my reading on the RasPi I have never found any information for more than one serial port. I hope I'm wrong, but a Google search only finds this one page, and there isn't enough info to be useful. Any links to more information?
      From: Gerry Hull <gerry@...>
      To: Raspberry_Pi_4-Ham_RADIO@yahoogroups.com
      Sent: Monday, March 24, 2014 12:40 PM
      Subject: Re: [Raspberry_Pi_4-Ham_RADIO] RS232 to Pi

      Way overkill for the Pi. 

      There are two built-in serial ports for the Pi (at logic level); if your GPS is at logic level, no worries there, but $3 board gives you RS-232 at regular voltages off of those pins.
      Any RS-232 needed beyond two should be off of the USB connector.

      Here's a great resource on RasPi serial ports:


      Gerry W1VE

      Gerry Hull, W1VE   | Nelson, NH USA | +1-617-CW-SPARK

      On Sun, Mar 9, 2014 at 12:33 PM, <kilo1mda@...> wrote:
      I've had a Pi for a while but am now focusing on using it for ham radio. I have been having problems interfacing my tiny trak 4 to my pi via a usb serial port connector so i was thinking of adding a serial port onto the pi. I came across this and at the very least found it intriguing:

      I know this is pricey and probably overkill but i am pretty new to linux and the Pi and it looks like a simple solution. Anyone tried one of these? 

      My next question would it possible to add an additional serial connector to the board above. The endgame is to interface the tinytrak4, a serial gps and possibly a screen on top. I know it will look like a monstrosity but it will be functional for me and possibly lead into additional units for my town EM.
      Thanks for your help.
      Matt, K1MDA 

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