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Bell 202 modem object how to change the start bit detection — Parallax Forums

Bell 202 modem object how to change the start bit detection

RPLORPLO Posts: 8
edited 2011-11-21 11:18 in Propeller 1
How I can change the start and stop bit detection?
Actually the object detect a Low (1200Hz) as start bit and High(2200hz) as stop bits
I want to detect inverted data start bit as high(2200Hz) and data stop bit as Low(1200Hz)

how I can change it?

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-10-15 11:43
    It's a kludge, but I think this will work. In the start_explicit method there are these two lines:
      frq1200 := 268_520_632
  frq2200 := 492_287_824

    Just swap the two values assigned. Please come back and let us know if it worked.

    -Phil
  • RPLORPLO Posts: 8
    edited 2011-10-15 19:20
    It work fine, thanks a lot Phil
  • RPLORPLO Posts: 8
    edited 2011-11-17 15:35
    Dear Phil,

    Related to Bell 202 modem, there is a way to clean the receive buffer before to put the modem in receive mode?

    RPLO
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2011-11-17 16:18
    That's really easy, and I'm not sure why I didn't think to include it. Just add the following method to the Bell 202 object:
    PUB clrinp

{ Clear the input character buffer }

  rdeq := renq

    -Phil
  • RPLORPLO Posts: 8
    edited 2011-11-21 11:18
    Thanks phil I wil try wit it

    RPLO
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