can obtain waveform

REAMME.md

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+# About
+
+This is a python code to connect RIGOL DS40024 Oscilliscope via Ethernet and do a FFT. The control is done by SCPI command.
+
+The list of command can be found in https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-06f3/1/-/-/-/-/MSO%26DS4000_programming.pdf
+
+# Required Libraries
+
+- pyvisa-py
+- zeroconf
+
+# find the device address
+
+```python
+import pyvisa as visa
+
+# Initialize visa resource manager
+rm = visa.ResourceManager('@py')
+
+# print(rm.list_resources_info() )
+print( rm.list_resources() )
+```

test.py

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+#!/usr/bin/python3
+
+import pyvisa as visa
+import time
+
+def Query(cmd : str) -> str :
+  haha = osc.query(cmd).rstrip('\n')
+  print(cmd + " : |" + haha + "|")
+  return haha
+
+def Write(cmd : str):
+  osc.write(cmd)
+
+def AskWaveParameter():
+  haha = Query('WAVEFORM:Preamble?')
+  result = haha.split(',')
+  print(" Format :" + result[0]) 
+  print("   Mode :" + result[1]) 
+  print(" Points :" + result[2]) 
+  print("Average :" + result[3]) 
+  print(" X-Step :" + result[4] + " sec") 
+  print("X-Start :" + result[5] + " sec") 
+  print("  X-Ref :" + result[6] ) 
+  print(" Y-Step :" + result[7] + " V" ) 
+  print("Y-Start :" + result[8] + " V") 
+  print("  Y-Ref :" + result[9] ) 
+  return result
+
+
+#=========================================
+
+# Initialize visa resource manager
+rm = visa.ResourceManager('@py')
+
+osc = rm.open_resource('TCPIP::128.186.111.202::INSTR')
+osc.timeout = 25000
+Query('*IDN?')
+# Query(':SYST:VERSION?')
+
+#Write(':STOP')
+#Write(':RUN')
+
+#================ channel setting
+#Write('CHAN1:OFFSET 0.0')
+#Write('CHAN1:IMPEDANCE FIFTY') #set to 50 Ohm
+#Write('CHAN1:IMPEDANCE OMEG') #set to 1Mohm
+#Write('CHAN1:SCALE 0.2')  #set vertical scale is 0.1V/div
+
+#================ mesurement
+# Query('MEASURE:FREQ? CHAN1') #measure freqeuncy of ch1 in Hz
+#Query('MEASURE:VMAX? CHAN1') #measure VMaX of ch1 in V
+#Query('MEASURE:VMIN? CHAN1') #measure VMin of ch1 in V
+#Query('MEASURE:VPP? CHAN1') #measure Vpp of ch1 in V
+#Query('MEASURE:VRMS? CHAN1') #measure Vrms of ch1 in V
+
+#================ time axis
+#Query('TIMEBASE:OFFSET?') #offset in sec
+#Write('TIMEBASE:OFFSET 6.0e-6') #offset in sec, pos to the right, neg to the left
+#Write('TIMEBASE:SCALE 2.0e-6') # set time scale to be 2us/div
+
+#================ trigger
+#Write('TRIG:MODE EDGE') #set trigger mode to be EDGE; EDGE|PULSe|RUNT|NEDG|SLOPe|VIDeo|PATTern|RS232|IIC|SPI|CAN|FLEXray|USB
+#Query('TRIG:STATUS?') #ask if trigger is ok, return TD = triggered
+#Query('TRIG:EDGE:SLOPE?')
+#Write('TRIG:EDGE:SLOPE POS') #set trigger at positive slope; NEG
+#Write('TRIG:EDGE:SOURCE CHAN1') #set trigger for channel 1
+#Query('TRIG:EDGE:LEVEL?') #ask trigger level
+
+#=============== Waveform
+
+#--------------- read waveform on the screen
+Write('RUN')
+Write('WAVEFORM:RESET')
+Write('WAVEFORM:SOURCE CHAN1')
+Write('WAVEFORM:FORMAT BYTE')
+Write('WAVEFORM:MODE NORM')
+
+para = AskWaveParameter()
+wfSize = int(para[2])
+
+Query('WAVEFORM:SOURCE?')
+Query('WAVEFORM:MODE?')
+Query('WAVEFORM:FORMAT?')
+
+# print("----------------- get data ")
+
+[status, wfLen] = Query('WAVEFORM:STATUS?').split(',')
+if status == "IDLE" and int(wfLen) >= 0 :
+  print("---- get waveform data")
+  osc.write('WAVEFORM:DATA?')
+  binary = osc.read_bytes(int(wfSize) +11 + 1) # 
+  # print(binary)
+  
+
+#---------- read data from internal memory, 1.12 million points, take like 
+# Write('STOP')
+# Write('WAVEFORM:RESET')
+# Write('WAVEFORM:SOURCE CHAN1')
+# Write('WAVEFORM:MODE RAW')  #internal 
+# Write('WAVEFORM:FORMAT BYTE')
+# Write('WAVEFORM:BEGIN')
+
+# para = AskWaveParameter()
+# wfSize = int(para[2])
+# Write('WAVEFORM:POINTS %d' % wfSize) 
+# Query('WAVEFORM:POINTS?') 
+
+# # print("----------------- get data ")
+# count = 0
+# while(count<10):
+#   [status, wfLen] = Query('WAVEFORM:STATUS?').split(',')
+#   if status == "IDLE" and int(wfLen) >= wfSize :
+#     print("---- get waveform data")
+#     osc.write('WAVEFORM:DATA?')
+#     start_time = time.time()
+#     binary = osc.read_bytes(int(wfLen)+11 + 1) # 
+#     end_time = time.time()
+#     print(binary)
+#     break
+  
+#   time.sleep(1)
+#   count = count + 1
+
+#Write('WAVEFORM:END')
+ 
+# duration = end_time - start_time
+# print("Duration:", duration, "seconds")
+
+#----------------- decode binary
+
+# Extracting the header (first 11 bytes)
+header = binary[:11]
+data_points = binary[11:]
+# Decode the 1-byte data points
+decoded_data = [byte for byte in data_points]
+print("Decoded data:", decoded_data)
+