open(COM,"< /dev/ttyS0")
Then try the rewind. I have a few examples of reading serial ports that seem to work on linux, if you want I could mail
them off to you. You might want to look at Device::SerialPort;
Here is a nice explanation-script I found once on the net.
#!/usr/bin/perl
+
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+
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#the ubiquitous RS-232 Serial Port. built an interface
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#for my Aware Electronics Geiger Counter (RM-70) that
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#used a Basic Stamp IISX chip set. Every 20 seconds it
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#would spit out an ASCII string of radiation and
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#temperature data. I had hunted around for examples
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#using the Device::SerialPort module and found many.
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#Most were copies of code used to read PBX data. But
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#it wouldn't work. Ouch. Finally, after much research
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#I realized that - by golly - you had to terminate
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#the IO with a new line and not a carriage return.
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#Oddly doing a cat </dev/ttyS0 worked, which faked me
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#out. So I added the line in the tty setup below that
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#converts CR to NL and zap-ity-do-dah it started terminating
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#and sending each read. Long live RS-232. Please send
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#along any suggestions and improvements. This also probably
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#explains why I had failed to get good reads from a
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#cheap-o RS-232 capable DVM a few years ago.
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#This was done in Perl 5.8.0 under RH Linux 9.0.
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#file geiger.pl
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#
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# Author: David Drake
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# Date: July 18, 2003
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# Requirements: Device::SerialPort 0.22 (from cpan July 2003)
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#
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# Version: 1.0
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#This script is used to read a serial port to obtain data from a
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#combined Geiger counter and temperature sensor.
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#The Geiger Counter is an Aware Electronics RM-70 unit. Each count
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#maps to one microR per hour. The RM-70 pulse output is sent to a
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#Basic Stamp-IISX microcontroller. The BS2SX accumulates counts for 20
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#seconds and then sends a serial data stream out of its serial port.
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#The data stream goes into the input serial port on the Linux system.
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#This program then tabulates the data to a log file.
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use Device::SerialPort;
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use Time::gmtime;
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$LOGDIR = "/home/zentara/perlplay/serial-comm"; # path to data fil
+e
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$LOGFILE = "geiger.log"; # file name to output to
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$PORT = "/dev/ttyS1"; # port to watch
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#
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#
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# Serial Settings
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#
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#make the serial port object
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#note the need to convert carriage returns to new lines to terminate e
+ach
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#read.
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$ob = Device::SerialPort->new($PORT) || die "Can't Open $PORT: $!";
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$ob->baudrate(9600) || die "failed setting baudrate";
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$ob->parity("none") || die "failed setting parity";
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$ob->databits(8) || die "failed setting databits";
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$ob->stty_icrnl(1) || die "failed setting convert cr to new line";
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$ob->handshake("none") || die "failed setting handshake";
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$ob->write_settings || die "no settings";
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#
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# open the logfile, and Port
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#
open( LOG, ">>${LOGDIR}/${LOGFILE}" )
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|| die "can't open smdr file $LOGDIR/$LOGFILE for append: $SUB $!\n"
+;
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select(LOG), $| = 1; # set nonbuffered mode, gets the chars out NOW
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open( DEV, "<$PORT" ) || die "Cannot open $PORT: $_";
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#
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# Loop forver, logging data to the log file
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#
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while ( $_ = <DEV> ) { # print input device to file
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$gmc = gmctime();
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print LOG $gmc, " ", $_;
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}
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undef $ob;
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#we are done dude
I'm not really a human, but I play one on earth.
flash japh
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