irwin@uiucdcs.cs.uiuc.edu (10/30/86)
I do not usually follow this forum, so if the question that I am about to ask has been covered before, please excuse my bringing up the subject again. I have a friend that has a new PC running PC-DOS. He has connected a serial interface printer to it that he has been running on another system. On the previous system, the printer worked fine. The manual for the printer states clearly that the printer uses X-On/X-Off for flow control. When he connects the printer to the PC, it over-runs the printer buffer (he is running it at 9600 baud). It is clear that PC-DOS must be using RTS/CTS instead of X-On/X-Off for flow control. No where in the documentation, can he find any reference on how to implement the X-On/X-Off protocol in PC-DOS, or in fact, what is actually being used for flow control. Does anyone out there know how??
berger@clio.Uiuc.ARPA (11/01/86)
Actually, I'm pretty sure that PC-DOS doesn't use flow control at all by default. You need to install a print spooler that supports flow control.