Path: utzoo!attcan!uunet!husc6!mailrus!uwmcsd1!ig!agate!violet.berkeley.edu!gts
From: gts@violet.berkeley.edu (Greg Small)
Newsgroups: comp.sys.ibm.pc
Subject: Flow control between IBM PC and printer
Message-ID: <14151@agate.BERKELEY.EDU>
Date: 12 Sep 88 00:25:10 GMT
Sender: usenet@agate.BERKELEY.EDU
Reply-To: gts@violet.berkeley.edu (Greg Small)
Organization: University of California, Berkeley
Lines: 27

= From: jbn@glacier.STANFORD.EDU (John B. Nagle)
= The Laserwriter (a IINT) is in DSR/DTR mode, 9600 baud.
= It seems strange, in that flow control is normally provided via RTS/CTS.
= Yet the Laserwriter documentation indicates that the Laserwriter tries
= to do flow control on DSR/DTR, which is nonstandard.

Actually, DTR/DSR is far more common for flow control than RTS/CTS and neither
were specified for that function (RTS/CTS was for half-duplex line turnaround).

Look in the back of the LaserWriter NT manual under printing on MS-DOS. It gives
the PostScript program to be sent to the LW that sets DTR/DSR flow control.
What they do not mention is that the file must be terminated with Ctrl-D.
Just copy the file to the LW serial port.

	statusdict begin 25 sccbatch exch pop
	4 eq {stop} if
	serverdict begin 0 exitserver
	statusdict begin 25 9600 4 setsccbatch
	Ctrl-D

This also should work for an old LaswerWriter Plus but not the plain LW.

Gregory T Small                                      (415)642-5979
Personal Computer Networking & Communications        gts@violet.Berkeley.EDU
Workstation Support Services - Software Group        ucbvax!jade!gts
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