Serial port i/o, how?

[presotto@plan9.att.com presotto@plan9.att.com]

Read:

http://helix/magic/man2html/3/scc
http://helix/magic/man2html/1/con

You can set baud rates, etc., by echoing the right goo into
the ctl file.  For example:

	echo -n b19200 > /dev/eai0ctl

sets eia0 to 19200 baud.  Not all the controls are sticky in
the Unix sense so you should do this while you have the /dev/eia0
open.

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>From cse.psu.edu!9fans-outgoing-owner Sun Aug  6 16:25:01 EDT 1995
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From:	ahm@goonsquad.spies.com (Andreas Meyer)
Subject: Re: Serial port i/o, how?
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philw@plan9.att.com writes:

> >how do I access a serial port?
> con -r /dev/eia0

When I do this, it just hangs. I'm using a hardware setup (null modem
cable to another machine) which works in DOS.

In another window, 'cat /dev/eia0ctl' returns:
cts dsr ring dcd dtr rts

Is there anything else I need to send to the control port?

Andy