Re: [hylafax-users] Serial latency

["Jay R. Ashworth" <jra@baylink.com>]

On Thu, Jun 28, 2001 at 01:48:33PM +0100, Tim Allen wrote:
> Breakout box shows no activity on pin 20 during transmission, pulses on
> hangup. So it looks as if our hardware handshaking from the Linux end isn't
> working. Presumably this is all done by kernel routines called by Hylafax
> which should toggle the DTR line when the UART fifo is getting full. Tried
> XonXoff for good measure with no improvement, so that may help to pinpoint
> the level at which things aren't working.

Hmmm... you should actually be looking at pins 4 and 5, and
specifically, if I'm reading this chart correctly, pin 4, Request to
Send, which my chart says is a signal Inbound to the DCE (modem).

That's the one that should toggle if the modem tries to overrun the
serial port.

Check setserial to see if the port is in hardware handshake mode, too,
I think.  [ looks ]  Nope.  stty.  The flag is rtscts.  Do an

stty </dev/name

*while* faxgetty has the modem, and see if that's set.  If not, then
faxgetty is blowing it for some reason.

Cheers
-- jra
-- 
Jay R. Ashworth                                                jra@baylink.com
Member of the Technical Staff     Baylink
The Suncoast Freenet         The Things I Think
Tampa Bay, Florida        http://baylink.pitas.com             +1 727 804 5015

   OS X: Because making Unix user-friendly was easier than debugging Windows


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