Subj : DTR Output on COM port
To   : borland.public.cpp.borlandcpp
From : Jack Sawatzky
Date : Mon Jul 25 2005 01:43 pm

I am trying to control the DTR output.  The following code does not
generate any errors, but it doesn't do anything else either;  pin 6 on
the RS232 remains stubbornly at 0 volts.

hcom=CreateFile("COM2", GENERIC_READ | GENERIC_WRITE,
                                      0, NULL,  OPEN_EXISTING, NULL, NULL);

GetCommState(hcom, &dcb );
dcb.fDtrControl=    DTR_CONTROL_ENABLE;   
SetCommState( hcom, &dcb );

EscapeCommFunction(hcom,SETDTR);


Can you tell me what I am doing wrong?
Thanks.

.