convert perl-script for voltcraft voltmeter to python [newbie]

Jean Dupont jeandupont115 at gmail.com
Fri Feb 3 14:11:54 CET 2012


As my request might have been too much asked, I have started doing
some coding myself.
I'm in doubt about the readline statement -which doesn't show anything
received- as the meter sends continuously streams of 11 bytes
Is there a way to just monitor with python what is arriving at a
serial port?

#!/usr/bin/python
#version 1-2-2012, script to read data from voltcraft vc940-meter
import serial, time, os
voltport='/dev/ttyUSB2'
print "Be sure the Voltcraft is connected to ttyUSB2"
print "Enter a filename:",
filename = raw_input()
voltdata = open(filename,'w')
ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,
timeout=15)
print "rs-232 parameters of Voltcraft: ", ser2
print "Opening " + ser2.portstr
received=ser2.readline()
print received
print "Goodbye, data logged in file:"
print filename
ser2.close()
# Close file
voltdata.close()




On 2 feb, 21:57, Jean Dupont <jeandupont... at gmail.com> wrote:
> I'd like to read in the output of a voltcraft vc960 voltmeter
> connected to a usb-port.
> I found the perl-script below but I'd like to accomplish the same with
> python:
> I guess I have to use the module serial but I don't know how I should
> set the serial parameters so they are the same as in the perl-script.
> Could someone supply me the command for setting the serial-parameters
> correctly
> in Python?
>
> thanks
> Jean
>
> #!/usr/bin/perl
>
> use strict;
> use warnings;
>
> use Device::SerialPort;
>
> die("Usage: $0 /dev/ttyS0\n") unless $#ARGV == 0;
>
> my ($devicepath) = @ARGV;
>
> my $port = new Device::SerialPort($devicepath);
> die "Couldn't open serial port" if ! defined $port;
>
> $port->baudrate(2400);
> $port->databits(8);
> $port->parity("none");
> $port->stopbits(1);
> $port->handshake("none");
> $port->rts_active(0);
> $port->dtr_active(1);
>
> #$port->read_char_time(5);     # wait 5ms per character
> $port->read_const_time(200);   # 0.2 second per unfulfilled "read"
> call
> $| = 1; # autoflush STDOUT
> while(1) {
>         my ($nin, $in) = $port->read(255);
>         print $in;
>
> }
>
> $port->close;




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