Path: csiph.com!usenet.pasdenom.info!dedibox.gegeweb.org!gegeweb.eu!nntpfeed.proxad.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!rt.uk.eu.org!nntp-feed.chiark.greenend.org.uk!ewrotcd!news.nosignal.org!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.013 X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'implements': 0.07; 'subject:skip:c 10': 0.07; 'python': 0.09; 'cc:addr:python-list': 0.10; 'dec': 0.15; 'character).': 0.16; 'received:mac.com': 0.16; 'wrote:': 0.17; 'byte': 0.17; 'driver': 0.17; 'received:10.0.1': 0.17; 'thanks,': 0.18; 'examples': 0.18; 'written': 0.20; 'subject:problem': 0.22; 'device': 0.24; 'cc:2**1': 0.24; 'command': 0.24; 'cc:addr:python.org': 0.25; 'skip:m 30': 0.26; 'jean': 0.29; 'pointer.': 0.29; 'url:mailman': 0.29; "i'm": 0.29; 'call.': 0.30; 'writes': 0.30; 'function': 0.30; 'url:python': 0.32; 'url:listinfo': 0.32; '11,': 0.33; 'int': 0.33; 'received:10.0': 0.33; 'another': 0.33; 'received:17': 0.35; 'pm,': 0.35; 'something': 0.35; 'really': 0.36; 'skip:u 20': 0.36; 'but': 0.36; 'url:org': 0.36; 'cc:no real name:2**1': 0.36; 'characters': 0.36; 'depends': 0.36; 'subject:with': 0.36; 'does': 0.37; 'subject:: ': 0.38; 'received:10': 0.38; 'notice': 0.39; 'where': 0.40; 'subject:-': 0.40; 'url:mail': 0.40; 'from:no real name:2**0': 0.60; 'course.': 0.62; 'charset:windows-1252': 0.65; 'counts': 0.81; 'suspicious': 0.91 MIME-version: 1.0 Content-type: text/plain; charset=windows-1252 Subject: Re: problem with usbtmc-communication From: wrw@mac.com In-reply-to: Date: Tue, 11 Dec 2012 21:21:06 -0500 Content-transfer-encoding: quoted-printable References: <05927d41-f73f-4fef-9a6d-4133e5c7d86a@n8g2000vbb.googlegroups.com> <123edfab-b46a-4a47-8b73-3f47e807e074@c16g2000yqi.googlegroups.com> <01cdbc70-7e46-4225-9baa-b555619d1aa8@10g2000yqo.googlegroups.com> <99b04e06-734c-4702-bf74-855e28d8f633@x20g2000vbf.googlegroups.com> <50b9eb4f-f319-491d-894c-2a9386b6941a@x20g2000vbf.googlegroups.com> To: Jean Dubois X-Mailer: Apple Mail (2.1499) Cc: python-list@python.org, wrw@mac.com X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 39 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1355278877 news.xs4all.nl 6861 [2001:888:2000:d::a6]:55910 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:34675 On Dec 11, 2012, at 3:48 PM, Jean Dubois = wrote: [byte] >>=20 >> OK - I see where the examples came from, and I notice - >>=20 >> int my_inst; >> my_inst=3Dopen(=93/dev/usbtmc1=94,O_RDWR); >> write(my_inst,=94*RST\n=94,5); >> close(my_inst); >>=20 >> and similarly in another place - >>=20 >> retval=3Dwrite(myfile,"*IDN?\n",6); >>=20 >> Note that both write commands contain a byte count of the number of = characters to be written (\n counts as one character). >> Again, the read commands contain byte counts. I'm very suspicious = that a write command with no byte count writes nothing, but does move a = buffer pointer. >>=20 >> -Bill >=20 > Does Python support/implement simular commands? Can I use > usbkeith.write("*IDN?\n",6) and something simular for the reading > commands? >=20 > thanks, > jean > --=20 > http://mail.python.org/mailman/listinfo/python-list Yes of course. BUT, that isn't really a python question, it depends on = how the device driver implements the function call. -Bill