Groups > comp.lang.python > #19993

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

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From	Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject	Re: convert perl-script for voltcraft voltmeter to python [newbie]
Date	Tue, 07 Feb 2012 17:57:37 -0500
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On Tue, 7 Feb 2012 11:44:40 -0800 (PST), Jean Dupont
<jeandupont115@gmail.com> wrote:


>It is not so obvious as you might think, one reason being the
>handshake line(s?) are used in an unconvential way to supply power to
>the rs232-optical interface

	That could be a problem... 1) USB<>Serial converters may not supply
emulation of ALL the handshake lines. 2) USB ports don't supply much
power -- what is it, each powered hub provides 500mA? (shared by all
ports on the hub?)
http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power

	So even if the converter supplies both the RS-232 voltages and the
control lines, it may not have enough power to activate a device.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

convert perl-script for voltcraft voltmeter to python [newbie] Jean Dupont <jeandupont115@gmail.com> - 2012-02-02 12:57 -0800
  Re: convert perl-script for voltcraft voltmeter to python [newbie] Jean Dupont <jeandupont115@gmail.com> - 2012-02-03 05:11 -0800
    Re: convert perl-script for voltcraft voltmeter to python [newbie] Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-07 12:44 -0500
      Re: convert perl-script for voltcraft voltmeter to python [newbie] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-07 11:47 -0800
    Re: convert perl-script for voltcraft voltmeter to python [newbie] Dietmar Schwertberger <news@schwertberger.de> - 2012-02-08 01:26 +0100
      Re: convert perl-script for voltcraft voltmeter to python [newbie] Jean Dupont <jeandupont115@gmail.com> - 2012-02-08 04:24 -0800
  Re: convert perl-script for voltcraft voltmeter to python [newbie] Terry Reedy <tjreedy@udel.edu> - 2012-02-06 23:21 -0500
    Re: convert perl-script for voltcraft voltmeter to python [newbie] Jean Dupont <jeandupont115@gmail.com> - 2012-02-07 11:44 -0800
      Re: convert perl-script for voltcraft voltmeter to python [newbie] Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-07 17:57 -0500

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