ZoneMinder Forums

Posted: **Mon Oct 23, 2006 11:19 pm**

Hi guys:

I have been investigating the perl serial port stuff some more and am
somewhat convinced that there may be a problem with the api regarding
FC5.

I tryed changing the baudrate in both
zmcontrol-pelco-p.pl ( org 4K8 )
zmcontrol-pelco-d.pl ( org 9K6 )

It just stays at the system default ( 9K6 ). If I change the PTZ camera's
to run a 9K6 communication works. If I change the baud rate to anything else
it fails
-IE change camera to 4K8 and zmcontol to 4K8 ( no work )
change camera to 9k6 and works.

I got the Perl::Serial from Dries but I don't know how to go about resolving the issue.
- I have changed ttyS0 to be rw by all ( 777 )

Any ideas???
-I can work around it, but would be nice to resolve

Thanks
Jitz

I don't think this is a general problem as I run my cameras at 2.4k anyway. I assume you have tried a simple test script with just the serial bits in it? Can you change the port speed with stty or minicom etc?

Posted: **Mon Oct 23, 2006 11:22 pm**

I put together a quick perl script to test changing the baudrate

Code: Select all

#!/usr/bin/perl -w

use Device::SerialPort qw( :PARAM :STAT 0.07 );;

my $device = "/dev/ttyS0";
my $serial_port = new Device::SerialPort( $device );

$serial_port->databits(8);
$serial_port->parity('none');
$serial_port->stopbits(1);
$serial_port->handshake('none');
 
$serial_port->read_const_time(50);
$serial_port->read_char_time(10);

if ( $serial_port->baudrate(2400) == 0 )
{
    printf "Waiting for 1ck\n" ;
}
else
{
    printf "Waiting for 2ck\n" ;
}

$count_out = $serial_port->write("Hello World");
printf "count out = %d\n", $count_out;

sleep(1);

$serial_port->close();

printf "hello world\n";[/code]

I verified that perl:Serial does modify the baudrate but when
I run script via zoneminder, it doesn't???

Kinda stumped. Sounds like it could be priviledges but on what/where??

Jitz

Posted: **Tue Oct 24, 2006 10:22 am**

The only things I can think of at the moment are that zmvideo-*.pl scripts are run in tainted mode (with the -wT) on the bang line. Or that there is something in having the script executed by apache.

You should be able to simulate both of these circumstances to eliminate them. If you do and it still doesn't work then I too will be a bit stumped.

ZoneMinder Forums

FC5 Serial port baudrate issue

FC5 Serial port baudrate issue

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