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From: jh@moon.nbn.com (John Harkin)
Newsgroups: alt.sys.sun,comp.dcom.modems
Subject: Re: Hardware flow control on dial in
Keywords: uucico RTS CTS SunOS 4.1
Message-ID: <1991May8.190653.25281@moon.nbn.com>
Date: 8 May 91 19:06:53 GMT
References: <TXEQ6..@linac.fnal.gov>
Organization: North Bay Network, San Rafael, CA USA
Lines: 32

palkovic@linac.fnal.gov (John Palkovic) writes:

>I have a 2400 bd MNP5 modem connected to serial port b of a Sun 4/260
>running SunOS 4.1.  Bidirectional hardware flow control (HFC) *is*
>enabled in the modem (a Microcom AX/2400c) with AT\Q3.

>There are two systems that poll me at 2400 MNP4 with the "e" protocol.
>I find that the file transfers *to the polling system* always fail if
>the serial interface to the modem is running at 9600 bd. Backing off
>to 2400 bd they are *much* more reliable, leading me to believe I have
>a flow control problem. Any thoughts?

You can enable HFC by putting ":ms=crtscts:" in the gettytab entry
for your dialin line.  For instance, I do that with a Telebit T2500
running at 19200 interface speed with this entry:

g|std.19200|19200-baud:\
	:sp#19200:ms=crtscts:to#45:de#2:

Translation:
	run at 19200
	use hardware handshaking
	timeout after 45 seconds
	delay printing a prompt for two seconds

You also need to run "ttysoftcar" in your /etc/rc so that the hardware
handshaking isn't ignored.  RTFM for more info.  :-)

John
-- 
John Harkin    +1 415 472-2452    uunet!moon!jh    jh@nbn.com
North Bay Network - News and mail for Marin county and vicinity