Date: Sun, 22 Aug 1999 23:49:16 +0200 From: Roelof Osinga <roelof@osinga.org> To: Isaac Flemming <iflemmin@mission.mvnc.edu> Cc: questions@FreeBSD.ORG, Kenny W Drobnack <kdrobnac@mission.mvnc.edu> Subject: Re: Dumb terminal(s) through serial connection(s) Message-ID: <37C0705C.AE85E0EF@nisser.com> References: <Pine.GSO.3.96.990822034706.13238B-100000@mission.mvnc.edu>
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Isaac Flemming wrote: > > > According to all the FAQ's/tutorials I have read my terminals (assuming > they are properly connected) should be getting a login prompt but they are > not. I am very new at this and am at a total loss as what to try next. Is > there any way I can be sure the terminals are connected correctly (I am > pretty sure they are, I am using standard serial/modem cables), and if > they are connected correctly is there anything I am missing? Yes there is. As others have already said you need null-modem cables. If you don't have them you can make 'm quite easily. The most basic form is connecting pins 2-3, 3-2, 7-7. The next thing you need to do is to setup the handshaking. With the minimum cable, or when you're still testing, you need a lower baudrate and no handshaking. So 9600 bps, tops. Then try and see if something happens. If not hook up 2 CRTs with that null-modem cable and see if you type on one it appears on the other and vice-versa. If not I hope you got MC-1488/89's (or something like that, been awhile). Static electricity is known to blow those chips. They're responsible to up the UART TTL signals to RS-232C levels. Only after that you go to higher baudrates and handshaking. You will be wanting hardware handshaking, since that's fastest and frees the ^Q & ^S keys (XON, XOFF). Howewer that will also mean you'll need at least another wire in your cable connecting the right pins. Is described in the Wyse manual. HTH, Roelof -- Home is where the (@) http://eboa.com/ is. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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