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Operating Systems Solaris Carrier Detection in Solaris 8 for Dial in and Null Modem Connections Post 302820939 by DGPickett on Thursday 13th of June 2013 05:00:08 PM
Old 06-13-2013
A null modem is two cable heads and some wires. You can force CD true all the time with wiring it to DTR on the other side (if the other side powers off, there is no carrier). Wiring plans vary. Similar rules apply to other leads. Wiring varies to simulate a half duplex switched carrier modem as opposed to a full duplex continuous carrier modem. With the right wiring, it should be a rock. https://en.wikipedia.org/wiki/Null_modem Two DTE's, each pretending to be DCE to the other. https://en.wikipedia.org/wiki/RS-232
 

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Device::Modem::UsRobotics(3pm)				User Contributed Perl Documentation			    Device::Modem::UsRobotics(3pm)

NAME
Device::Modem::UsRobotics - USR modems extensions to control self-mode SYNOPSIS
use Device::Modem::UsRobotics; my $modem = new Device::Modem::UsRobotics( port => '/dev/ttyS1' ); $modem->connect( baudrate => 9600 ); my %info = $modem->messages_info(); print "There are $info{unreleased_voice_msg} unread voice messages on $info{stored_voice_msg} total "; print "There are $info{unreleased_fax_msg} unread fax messages on $info{stored_fax_msg} total "; # Get details about message n. X my %msg = $modem->message_info(1); index type information attributes status day hour minute callerid page addresshigh addresslow checksum print 'This is a ', ($msg{type} == 2 ? 'voice' : 'fax'), 'message', " "; print 'It came from no. ', $msg{callerid}, " "; # ... # Now clear all messages $modem->clear_memory(); WARNING
This module is not documented yet, and it is a rough work in progress. Until now, it correctly reads voice/fax messages information, but when saving voice messages to disk, sometimes they are incorrectly decoded. So, if you need a working program, check out the good old TkUsr by Ludovic Drolez, unless you want to help develop Device::Modem::UsRobotics. DOCS TO BE COMPLETED FROM NOW..... Yes, I'm a bad boy :-) DESCRIPTION
Bla Bla Bla... METHODS
clear_memory() Used to permanently clear the memory space of the modem. There are separate memory spaces, one for voice/fax messages and one for user set- tings. Examples: $modem->clear_memory('user'); # or $modem->clear_memory(1) $modem->clear_memory('messages'); # or $modem->clear_memory(2) To clear both, you can use: $modem->clear_memory('all'); # or $modem->clear_memory(0); Parameters: $memtype String or integer that selects the type of memory to be cleared, where 0 is for "all", 1 is for "user" memory, 2 is for "messages" mem- ory. SUPPORT
Please feel free to contact me at my e-mail address cosimo@cpan.org for any information, to resolve problems you can encounter with this module or for any kind of commercial support you may need. AUTHOR
Cosimo Streppone, cosimo@cpan.org COPYRIGHT
(C) 2004-2005 Cosimo Streppone, cosimo@cpan.org This library is free software; you can only redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Device::Modem, perl perl v5.8.8 2005-04-30 Device::Modem::UsRobotics(3pm)
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