barcode scanner

[Jim Bufalini]

Many years ago I developed a system that collected
data from a large number
of barcode readers, as well as, other electronic
systems. Most barcode
readers then transmitted serially and could attach a
prefix and postfix to
the scan. We attached the individual readers to MUXs
and the MUXs to a large
serial switch (actually bank of serial switches). The
serial switch had
memory (most do). This then goes, of course,
attachesto one serial port on
the computer.

So, depending on the nature of your app, you can then
either let the reads
accumulate in the switch and have your program poll
the serial port when
your application is ready, or set up your program to
be interrupt or event
driven by the serial port. Use the prefix and postfix
feature of the barcode
readers to parse your stream.

Jim Bufalini

-----Original Message-----
From: use-revolution-bounces at lists.runrev.com
[mailto:use-revolution-bounces at lists.runrev.com]On
Behalf Of kee nethery
Sent: Tuesday, November 30, 2004 6:18 PM
To: How to use Revolution
Subject: Re: barcode scanner



On Nov 30, 2004, at 3:37 AM, Paolo Mazza wrote:

> I want  my  rev-application to collect  data from a 
barcode scanner
> in background .  In other words,  I want to use my
PC (WIN-XP) with
> other programs and at the same time I want  my
application to collect
> and save data from the barcode scanner. Is it
possible?

yes but the input has to be through something other
than the normal
keyboard interface. You'll need an alternate input
stream and you'll
need code to watch that input stream. The most common,
but becoming
obsolete quickly, is a serial interface. Then you have
your app watch
the serial interface and handle the data it receives.
Beyond my
abilities, I think Sarah has done much more work in
this area.

Kee Nethery

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