If you are running under DOS, you can use the low-level IO routines for many COM port communications. (See help file for FOPEN(), FREAD(), FWRITE(), etc. and I believe there are some samples using modems in the GOODIES sample code directory.) If you are running under Windows - especially NT/2000/XP which don't allow direct access to the hardware, these routines may not work for COM ports.
I think WinWedge would do it. It even has an analize mode that lets you see what the bar code reader is sending.
The problem is that this software costs a couple of hundred US$ (
A brand new bar code scanner with a built in wedge (plugs into the keyboard port) can be had around US$150 new or $50 or so on ebay/sold.com.
Serial scanners are a little outdated these days.
Ken F
You don't mention what operating software you are using but this might be of interest.
We have serial Barcode scanners and after reloading Windows 98 SE on a machines, I had to turn the Power-Saving off for the ports in the windows registry as it wasn't turning the ports back on when DOS tried to use them (I would tell you the settings but I can't find the FAQ on Microsoft's site!). This is probably the same for most recent versions of Windows.
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