Re: [Expectperl-discuss] Communicating with modem

[Austin S. <te...@of...>]

On Mon, Sep 23, 2002 at 12:32:45PM -0400, Hal Vaughan wrote:
> I'm using expect to dial up a remote system, retreive data, then log off.  
> Other perl scripts then process the data.
> 
> The problem is in communicating with my modem.  I've noticed that when I first 
> re-boot (and possibly other times, but I'm not sure), when I run this 
> program, I keep getting an endless string of ^H from the modem.  If, instead, 
> I run Minicom, then quit without sending the termination strings  (quitting 
> instead of a "regular" exit from the program), then run my perl programs, I 
> have no problem accessing the modem.
> 
> Is this an Expect problem, or is Minicom doing something in C that Perl 
> doesn't do?  I don't know C, but as best I can tell Minicom does some things 
> with ioctl (and perhaps more), but I have no clear idea what's going on.
> 
> Any ideas?
> 

	It's been awhile since I've worked with modems, but IIRC you need to
stty('raw') the line before talking to the modem. In particular I think they
don't like the default 'ICANON' setting.
	I think most of the time I've just spawned cu (comes w/ taylor uucp
package) rather than work with the modem directly anyway. It does locking
on the device, among other benefits. YMMV.

	Austin