"...the purpose of a higher-level programming language is usually to provide some mediation between the way a programmer would like to provide instructions and the way a machine needs to have them."
It seems like Python has come a long way in recent years and has been a hotbed of development.
It is avalible for most operating systems.
It is also possible use python on line without an install
Put it a different way: when to use C and when to use a scripting language?
I suggest looking at http://gribblelab.org/CBootcamp/1_Why_Program_In_C.html#sec-3
2.One would think that there would be a lot of free c language libraries for common tasks like using the serial port. What one finds is actually available are free Perl and Python modules. These are generally written in c but utilized using the scripting language.. This leads to quick efficient modules for common tasks and scripting for those things that are custom for the current project.
3.In general the scripting language handles the interface to the underlying operating system. The programmer does not need to learn the API each operating system that the script could be used with.
Find an introduction to matplotlib at http://matplotlib.sourceforge.net/users/intro.html
More at matplotlib
We have a USB instrument: the TBS1022 from Tektronix.
The programmers manual for this instrument can be found at:
Note that the same manual covers both the TBS1022 and the TDS1002B. We actually have some of both of these.
At the http://pyvisa.sourceforge.net/ link some very simple code is given for talking to a digital multimeter
import visa keithley = visa.instrumen("GPIB::12") print keithley.ask("*IDN?")
We should also be able to talk to our scopes with this type of code. Something to try out. Found an example using usb at http://www1.tek.com/forum/viewtopic.php?f=5&t=5221
From that example can see the following (note the instrument name):
import visa import numpy as np from struct import unpack import pylab scope = visa.instrument('USB0::0x0699::0x0401::No_Serial::INSTR')
In another example the python script first reads the intrument name from the attached instruments: http://www.home.agilent.com/owc_discussions/thread.jspa?messageID=106272&tstart=0
"Example 01 (directly with PyVisa):"
import visa import pylab # Get instrument VISAname visaInstrList = visa.get_instruments_list() myScope = visaInstrList+'::INSTR' scope = visa.instrument(myScope)
So I tried this out in a IDLE session.
Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>> import visa >>> visaInstrList = visa.get_instruments_list() >>> myScope = visaInstrList >>> myScope ['USB0::0x0699::0x03AE::C011174', 'COM1', 'COM3', 'LPT1', 'ASRL11'] >>> myScope = visaInstrList+'::INSTR' >>> scope = visa.instrument(myScope) >>> scope.ask("*IDN?") 'TEKTRONIX,TBS 1022,C011174,CF:91.1CT FV:v26.01' >>> scope.write('CH1:VOLTS 2.0') >>> scope.write('TRIG:MAIN:LEVEL 2.4') >>> scope.write('HOR:MAIN:SCALE 100E-6')
It appears to work! The TBS 1022 responded to the last three commands as expected (meaning that the vertical scale of channel one was set to 2 volts/div, the trigger level was set to 2.4 volts and the horizontal scale was set to 100 micro-seconds/div).
I also tried setting and reading both the time and date.
>>> scope.write('DATE "2013-06-18"') >>> scope.write('TIME "18:37:00"') >>> scope.ask('date?') '"2013-06-18"' >>> scope.ask('time?') '"18:38:23"'
Python control of equipment
I looked this up since I was interested.