CD-Check is a utility to trap a carrier detect on COM1 thru
COM4.  There is no warrante expressed or implied.  Use at 
your own risk.  CD-Check is the property of Scott McKnight.
It is free for use in a non-commercial environment.  For a
commercial liscense to use CD-Check, send $10:00 to

Scott McKnight
377 Bevill Ave
Blytheville, AR, 72315
FIDO: 1:389/2001
PH: (501) 532-6212 or 5641 (1200-14400, HST/V32)


Instruction for using CD-Check is simple. Type the command:

CD-Check [Port#]
example: CD-Check 1

  This example will check COM1 for a carrier detect.  If it finds one, it
will exit with errorlevel 0.  If no carrier is detected, it will exit
with errorlevel 1.

A simple batch file routine for trapping the errorlevel would go
something like this:

:CD-Check
   CD-Check 1
     if Errorlevel 1 Goto No-carrier
     if Errorlevel 0 Goto Carrier-on
   :No-carrier
     Goto routine-1, no carrier is detected
   :Carrier-on
     Goto routine-0, a carrier is detected