kenarora@mipos2.intel.com (Judge K Arora) (11/27/90)
I'm not a frequent reader of this newgroups, so pardon me if this has been asked before..... I'm trying to capture data that's coming off a serial port from another computer (PC) onto my 386i (Sun OS 4.0.2). I'd like to capture in from a program running on the console. I've configured /etc/ttytab (and /etc/ttys for back compatibility) to reflect the existence of the /dev/ttya, but it does not have getty running, and its status is off. First, are these the correct settings, and secondly, what is the open call (and further ioctl's, if necessary) needed to do this (I believe canonical mode will do)? Alternately, but not quite as good a solution for the problem, if I were to configure /dev/ttya as a "Unix" terminal (i.e. run getty on it) is there a better way of capturing data that is sent from the PC to the sun, keeping in mind that (at startup, at least) some commands need to go the other way? Any replies by e-mail would be greatly appreciated. Thanks, Ken Arora kenarora@mipos2.intel.com kenarora@portia.stanford.edu (in case the 1st addr. bounces)
kenarora@mipos2.intel.com (Judge K Arora) (12/05/90)
In article <1092@inews.intel.com> I (Judge K Arora) write: > I'm trying to capture data that's coming off a serial port from another >computer (PC) onto my 386i (Sun OS 4.0.2). I'd like to capture in from a >program running on the console. I've configured /etc/ttytab (and /etc/ttys ... >the correct settings, and secondly, what is the open call (and further >ioctl's, if necessary) needed to do this (I believe canonical mode will >do)? Yes, I know I'm supposed to open /dev/ttya, and I also know about the termios data structures (using ioctls for TCGETS, TCSETS). The problem is that (at least at 9600 baud, w/o RTS/CTS handshaking, because the PC doesn't support it) I keep dropping characters every so often (about every 7000-8000 characters), and get some garbled data instead (usually mostly ascii 02 (control-B)). I've also tried doing this from the shell (cat < /dev/ttya > foo), and encountered the same problem. I've tried setting the IXOFF protocol in the termios data structure, and that doesn't seem to help. I'm still using canonical mode, but the few experiments I've tried with non-canonical mode don't seem to work any better. Has anyone else tried doing this? on a 386i? Is 9600 baud too fast? Should I change a specific flag in the termios struct? Will non-canonical mode help? The answers to these and other exciting questions are eagarly awaited (next week, same 'nix-time, same 'nix-group) Thanks again, Ken Arora kenarora@mipos2.intel.com kenarora@portia.stanford.edu (in case the 1st addr. bounces)