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annotate example.py @ 79:84f96c5fe791

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Use different message ID that does not result in "Query UNTERMINATE" messages in the error log. Fix testsrq. Rename queryrsb to querystb as that matches the operating manual.
author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 27 Sep 2024 16:53:43 +0930
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2009
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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27
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28 import usb488
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29 import matplotlib.pylab as pylab
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30 import numpy
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31 import time
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32
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33 def main():
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34 u = usb488.USB488Device()
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35 print("Found device")
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36
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37 u.write("*IDN?")
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38 print("IDN reports " + u.read())
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39
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40 u.write("DATA:ENC RIB") # Big endian signed
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41 u.write("DATA:WIDTH 2") # 2 bytes wide
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42 u.write("SELECT:CH1 ON") # Turn channel 1 on
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43 u.write("DATA:SOURCE CH1") # Set the curve source to channel 1
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44
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45 u.write("CH1:SCALE?")
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46 vscale = float(u.read(1).split()[1])
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47 print("Channel 1 scale is %.2f volts/div" % (vscale))
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48 u.write("HOR:MAIN:SCALE?")
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49 hscale = float(u.read(1).split()[1])
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50 print("Horizontal scale is %f sec/div" % (hscale))
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51
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52 u.write("*WAI") # Make sure the previous commands have been
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53 # executed
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54 u.write("CURVE?") # Ask for the curve data
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55 then = time.time()
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56 result = u.read(1.0) # Takes the CRO a while for this
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57 now = time.time()
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58 print("CURVE read took %f milliseconds" % ((now - then) * 1000.0))
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59 data = result[13:] # Chop off the header (should verify this really..)
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60 dattype = numpy.dtype('>h') # Big endian 16 bit quantity
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61 ary = numpy.fromstring(data, dtype = dattype)
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62 ary = ary / 32768.0 * vscale
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63 pylab.plot(ary)
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64 pylab.show()
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65
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66 if __name__ == "__main__":
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67 main()