Announcement

Collapse
No announcement yet.

Multi drop control of displays

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Multi drop control of displays

    I would like to drive multiple displays (3) from a single micro processor.

    Is there any of the displays that have a serial interface which enables multi-dropping from a single serial interface.

    The Displays will receive very few data elements and at a low rate 1-2 Hz.

    Thanks in advance.

  • #2


    There's no exact serial interface samples that do this, but several users have done this in the past with their own protocol

    They have been using the com_TXbuffer() turnaround pin to enable the addressed module to respond, and either the designer or ViSi environment to program.
    Mark

    Comment


    • #3


      Thanks but could you please elaborate on the physical interconnect?

      I assume that the Tx from the uProcessor goes to the Rx of all the displays?

      But what about the returns? Txs from the 3 Displays?

      Thanks in advance

      Comment


      • #4


        You need to use the turnaround pin to gate the TX of each display so that only the one currently transmitting will be connected to TX.
        Mark

        Comment


        • #5


          I did try to find the "turnaround pin" in the Specification but failed hence my question.

          So do you series connect all the Txs and use a discrete from each display to control who transmits? Or?

          Sorry for this simple question

          Thanks again

          Comment


          • #6


            Look at com_TXbuffer() in the internal functions manual, you connect the "Turnaround pin" to a tristate buffer to enable the serial output.

            Of course, if you were using a fairly low baud rate you could use an Open Collector buffer and not use the 'turnaround pin'.
            Mark

            Comment


            • #7


              Thanks

              Comment

              Working...
              X