Re: MSCOMM DSR detection, whcih speed is boundary?

From: Dick Grier (dick_grierNOSPAM_at_msn.com)
Date: 10/13/04 

Date: Wed, 13 Oct 2004 11:08:02 -0600

Hi,

1 MHz? This is FAR beyond the capability of ANY PC based hardware that uses
Windows. 1KHz is not even possible over the RS-232 port, though it would be
over a parallel port.

The Windows serial port driver "de-glitches" the RS-232 hardware input
lines. Any transition that does not meet a minimum standard duration
(surely in excess of 1 mS) will be ignored.

*** 

-- 
Richard Grier  (Microsoft Visual Basic MVP)
See www.hardandsoftware.net for contact information.
Author of Visual Basic Programmer's Guide to Serial Communications, 4th 
Edition ISBN 1-890422-28-2  (391 pages) published July 2004.  See 
www.mabry.com/vbpgser4 to order.