guarna@uicsrd.csrd.uiuc.edu (12/28/89)
I just added the IBM Dual Async board to my Model 80 running AIX. I have a terminal on one of these lines (tty2) using a three wire interface. Everything seems to work fine until I turn the terminal off. When I turn it on later to try and use the terminal again, the line won't communicate. I think this is a baud rate problem...I get question marks on the screen for each keypress. My terminal generates those when it gets framing/parity/etc. errors. If I pdisable and penable the tty line, all is well and I get the logon banner again. Has anyone else seen and solved this problem? Vince Guarna University of Illinois (217) 244-0071 guarna@uicsrd.csrd.uiuc.edu
peter@hydrovax.nmt.edu (Peter A. Blemel) (12/29/89)
In article <48200002@uicsrd.csrd.uiuc.edu>, guarna@uicsrd.csrd.uiuc.edu writes... >... Everything >seems to work fine until I turn the terminal off. When I turn it on later >to try and use the terminal again, the line won't communicate. The 135 using a dual rs232 (9pin) adapter configured as sp1,sp2 (primary, secondary) has a similar problem (I don't think it's baud rate). The getty will completely forget about the terminal if the terminal is power cycled. Killing the getty works as init forks a new one, and I get the login prompt (which is effectively what you do by disable/re-enableing the terminal.)`N[ I intend to putz with the devices configuration some today. I'll post the results. Peter ----- peter@hydrovax.nmt.edu peter@amber.nmt.edu
johnny@edvvie.at (Johann Schweigl) (01/04/90)
From article <3694@nmtsun.nmt.edu>, by peter@hydrovax.nmt.edu (Peter A. Blemel): > In article <48200002@uicsrd.csrd.uiuc.edu>, guarna@uicsrd.csrd.uiuc.edu writes... >>... Everything >>seems to work fine until I turn the terminal off. When I turn it on later >>to try and use the terminal again, the line won't communicate. We had similar problems with a model 125 and 135. In our case, excessive noise was the cause. When a 3151 was switched off, the respective 3-wire RS232 line was a kind of antenna. Seems the terminal leaves the line ends open when not turned on. First action was to use shielded wire and connect everything to ground that *SHOULD* be grounded. That reduced the problems reasonably. Second, we switched to RS422. Since then, we have no trouble of this kind. -- This does not reflect the | Johann Schweigl | DOS? opinions of my employer. | johnny@edvvie.at | Kind of complicated I am busy enough by talking | | bootstrap loader ... about my own ... | EDVG Vienna |