1. Included in the archive:

DTRCTRL.PAS    A Turbo Pascal 6.0 unit for DTR control with
DTRCTRL.TPU    sources so you can compile this with another
               version of Turbo Pascal

DTR.PAS        A little utility to drop or raise DTR with Turbo
DTR.EXE        Pascal sources

HANGUP.PAS     A utility that will hang up the modem,
HANGUP.EXE     by dropping the DTR, pausing and raising the DTR

2. Usage of the DTRCTRL unit:

Two functions can be used in this unit:

 - DTRControl (COMPort: Byte; DTR: Boolean);
     You just have to specify for which COMPort you want to
     change the DTR State, and the DTR option is: TRUE = Raise
     DTR, FALSE = Drop DTR

 - DTRState (COMPort: Byte);
     Returns TRUE if the DTR of the specified COMPort is ON
     (Raised) and FALSE if the DTR is OFF (Dropped)

3. Other programs in the archive:

You can get the information about their usage by typing the name
of the EXE file without specifying any parameter.

4. Specifications:

If you want to use the DTR as a hangup utility, you have to
configure the modem so when the DTR is off, it hangs up. With
lots of modems, you configure it by typing: AT &D2.

5. Using the unit in your programs

There is no fee when you want to use this unit in your programs.
The only thing you have to do is to SHARE YOUR KNOWLEDGE with
other computer users!  If you have problems or questions with
serial port and modem programming (or other topics), you can
contact me:

 - VIA Mail:
       Les Logiciels de Marque inc.
       a/s Marc Boutet
       974 Senneterre
       Sainte-Foy, QuВbec, Canada
       G1X 3Y3

 - VIA America On-Line: BERGERONG

 - VIA BBS: (418) 651-1394 or (418) 651-7662, login on user:
   SUPPORT password: DTR

 - VIA Phone: (418) 653-1881

It will also be a pleasure for me to know that you use my units,
so let me know!

Good success!