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pySerial question, setting certain serial parameters [newbie]

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  pySerial question, setting certain serial parameters [newbie] Jean Dupont <jeandupont115@gmail.com> - 2012-02-04 04:47 -0800
    Re: pySerial question, setting certain serial parameters [newbie] Chris Rebert <clp2@rebertia.com> - 2012-02-06 20:48 -0800
    Re: pySerial question, setting certain serial parameters [newbie] Peter <peter.milliken@gmail.com> - 2012-02-07 16:16 -0800

#19923 — pySerial question, setting certain serial parameters [newbie]

I need to set the following options I found in a Perl-script in Python for serial communication with a device (a voltmeter):

$port->handshake("none");
$port->rts_active(0);
$port->dtr_active(1); 

I have thus far the following  statements but I think it does not set the above parameters correctly:
import serial
voltport='/dev/ttyUSB2'
ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,timeout=15) 

thanks
Jean

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#19936

On Sat, Feb 4, 2012 at 4:47 AM, Jean Dupont <jeandupont115@gmail.com> wrote:
> I need to set the following options I found in a Perl-script in Python for serial communication with a device (a voltmeter):
>
> $port->handshake("none");
> $port->rts_active(0);
> $port->dtr_active(1);
>
> I have thus far the following  statements but I think it does not set the above parameters correctly:
> import serial
> voltport='/dev/ttyUSB2'
> ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,timeout=15)

A link to the Perl library's documentation would be helpful.

Cheers,
Chris

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#19994

On Feb 4, 11:47 pm, Jean Dupont <jeandupont...@gmail.com> wrote:
> I need to set the following options I found in a Perl-script in Python for serial communication with a device (a voltmeter):
>
> $port->handshake("none");
> $port->rts_active(0);
> $port->dtr_active(1);
>
> I have thus far the following  statements but I think it does not set the above parameters correctly:
> import serial
> voltport='/dev/ttyUSB2'
> ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1,timeout=15)
>
> thanks
> Jean

My reading of the __init__ method documentations shows you should
have:

ser2 = serial.Serial(voltport, 2400, dsrdtr=True, timeout=15)

since the defaults for bytesize are EIGHTBITS (for which you use 8 -
wrong), parity is already default to PARITY_NONE (so this isn't
needed), stopbits defaults to STOPBITS_ONE (for which you use 1 -
wrong) and (assuming the Perl code "1" is to enable) dsrdtr=True
(xonxoff and rtscts both default to False).

Try that.

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