sorrow@oak.circa.ufl.edu (06/21/91)
I need some code examples on how to set the DTR or RTS line on a RS-232C port high or low. C or asm would be fine. Thanks, Brian /* Brian Hook -- MS-DOS Programmer for Contract ----------------------------------------------------------------- "Seamus, that's my dog...I saw her today at the reception...sorry, sixTEEN inches....better save the women and children first...but this one goes to 11! ..anymore of that plutonium nyborg?....there can be only ONE!....like a finger pointing to the moon....ease the seat back...one day closer to death */
msmith%peruvian.utah.edu@cs.utah.edu (Matthew Smith) (06/22/91)
In article <0094A6B3.5314B580@MAPLE.CIRCA.UFL.EDU> sorrow@oak.circa.ufl.edu writes: >I need some code examples on how to set the DTR or RTS line on a >RS-232C port high or low. C or asm would be fine. > >Thanks, > >Brian >/* >Brian Hook -- MS-DOS Programmer for Contract The Modem Control Register (address base address+0x04) is a bit mask of the various control lines, DTR, RTS, CTS, etc... To turn on RTS, turn on bit 1 (of bits 0-7 0=LSB), and to turn it off, set it to 0. DTR is controlled by bit 0 in the same register. I hope this helps you out. I figured it would be better than code... Matt Smith msmith@peruvian.utah.edu University of Utah Department of Computer Science