From owner-freebsd-questions  Wed Mar  5 19:50:41 1997
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Date: Wed, 5 Mar 1997 21:36:40 +0000 ()
From: Eric Yagerlener <eyager@novagate.com>
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Subject: Serial Printer flow control
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I have an Epson LQ-2550 that I have hooked up to my FreeBSD box.  For 
some reason the hardware flow control isn't working to prevent data from 
being sent to the printer when internal buffer is full.  I would have to 
use software flow control which could hopefully work.  I enabled the 
DC1/DC3 option on the printer itself, but it doesn't seem to work.  I'm 
not sure if DC1 and DC3 are the same as XON/XOFF.

In the configuration the baud rate is set to 9600.  The fs flag is set to 
0x82000c1 the xs flag is set to 0x820.  I suspect that I might have to set 
one of these flags to a different value make FreeBSD use DC1/DC3.  Does 
anyone know what flag I should set?

In the meantime I can use a baud rate of 1200 but that isn't fast enough 
to push the printer to 100% speed.

-- Eric