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| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Subject | Re: convert perl-script for voltcraft voltmeter to python [newbie] |
| Date | 2012-02-07 17:57 -0500 |
| References | <d953c169-0656-46c1-a3ba-5387c9c06df8@t30g2000vbx.googlegroups.com> <mailman.5487.1328588509.27778.python-list@python.org> <f6626e9a-ec89-4081-adea-07703e2ad6ee@t30g2000vbx.googlegroups.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.5524.1328655912.27778.python-list@python.org> (permalink) |
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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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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