skgupta@iastate.edu (Gupta Sharad Kumar) (03/19/91)
I am building an electronic bulletin board for a research project. I have
a modem connected to one serial port(COM1) of my Zenith 386 machine and a
device called DECtalk (converts text to speech) to the other port(COM2).
I have written an interrupt driven program to handle the incoming calls.
My question is that is it possible to connect both the devices to the same
phone line (i.e. is it possible to distinguish whether the incoming phone
call is for device connected to COM1 or for the device connected to COM2)?
If yes, then how can I do this? I will greatly appreciate any help in this
context.
Sharad Gupta
skgupta@iastate.edumarkh@csd4.csd.uwm.edu (Mark William Hopkins) (03/29/91)
In article <1991Mar19.052603.8737@news.iastate.edu> skgupta@iastate.edu (Gupta Sharad Kumar) writes: >I am building an electronic bulletin board for a research project. I have >a modem connected to one serial port(COM1) of my Zenith 386 machine and a >device called DECtalk (converts text to speech) to the other port(COM2). >I have written an interrupt driven program to handle the incoming calls. >My question is that is it possible to connect both the devices to the same >phone line (i.e. is it possible to distinguish whether the incoming phone >call is for device connected to COM1 or for the device connected to COM2)? The question's ambiguous. Under one interpretation, you're asking if it's possible to distinguish COM1 and COM2 when they are being used at the same time on the same machine, and the answer is yes, because they use different interrupts (and different interrupt handlers). Under another interpretation, you're asking if it's possible to send mixed data from COM1 and COM2 over the phone line and have the other end segregate the data out. The answer's yes, if you do it in software by making up a packet protocol for all parties involved to use. Under a third interpretation you're wrongly assuming that the DECtalk needs to be connected to the phone line because of a lack of knowledge of COM1 and COM2 being able to use separate interrupts, in which case the answer's the same as the first given.