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From: crash@jc3b21.UUCP (Frank J. Edwards)
Newsgroups: comp.sys.amiga.tech
Subject: using hardware handshaking on the SER: port
Keywords: serial.device hardware handshaking
Message-ID: <570@jc3b21.UUCP>
Date: 11 Feb 89 16:20:51 GMT
Organization: St. Petersburg Jr. College, FL
Lines: 22


	Maybe some of you people have had experience with this and can
tell me the answer:

	I open the serial.device (using code similar to the example in
the ROM Kernel: Lib and Dev manual) for 7WIRE handshaking.  I send one
line's worth of data to my plotter and I get an error 13 (Ser_NoDSR).
The DTR output on my plotter is run directly to the DSR pin, but I have
seen this signal drop low from the plotter when it's 256 character buffer
has filled up.  Possibility:  the plotters buffer fills up and DTR drops
low; the Amiga hasn't filled it's second buffer yet, but when it does
it sees that the DTR (DSR on it's end) is low and so generates the error.
The flaw in this theory:  I'm only writing about 18 characters before
getting the error!!

	I am at my wits end with this thing -- anyone have any ideas?
And don't suggest using xON/xOFF -- the *plotter* doesn't support it
(what can I say; its an old Apple plotter [ugh!]).

Thanks for any help.
Frank "Crash" Edwards
"Damn it, Jim, I'm a doctor, not a moon shuttle conductor!"