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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: convert perl-script for voltcraft voltmeter to python [newbie]
Date: Tue, 07 Feb 2012 12:44:36 -0500
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On Fri, 3 Feb 2012 05:11:54 -0800 (PST), Jean Dupont
<jeandupont115@gmail.com> wrote:

>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

	Well, since readline() pretty much by definition wants a line-ending
character before returning, it obviously won't work. (Side comment:
readline() isn't even shown as part of the basic Serial class -- it is
in a class FileLike: http://pyserial.sourceforge.net/pyserial_api.html
-- oh wait.. fine print says that is a base class for Serial on non-io
module systems).

	What is the boundary marker for your 11-byte chunks? You may need to
do a synchronization loop using

	while ser2.read() != marker: continue

then go into main processing loop with

	data = ser2.read(11)

to capture a "chunk".

	Oh, BTW...

> $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"

vs your

> ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE, 1, timeout=15)

	Your timeout is FIFTEEN SECONDS!

	Suspect you want something like

ser2 = serial.Serial(voltport, 2400, 8, serial.PARITY_NONE,
					serial.STOPBITS-ONE, timeout=0.200,
					dsrdtr = True)
and maybe also

ser2.setDTR(True)
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/