This should get the Waveform Data from the new Rigol DHO devices and formats it to be identical to saved .csv files from the device itself.

rigol_dho_waveform.py

#! /usr/bin/env python3
import pyvisa as visa
from serial.serialutil import SerialException
from decimal import Decimal, getcontext

def main():
    # Get list of connected devices
    rm = visa.ResourceManager()
    device_list = {}
    for device_name in rm.list_resources():
        print(device_name)
        device_id = ""
        try:
            device_id = rm.open_resource(device_name).query("*IDN?")
        except (visa.VisaIOError, FileNotFoundError, SerialException):
            pass
        print(f"device_id: {device_id}")
        if device_id.lower().startswith("rigol"): # Add only devices which names start with Rigol
            if device_name not in device_list:
                device_list[device_name] = rm.open_resource(device_name)

    print(f"device_list: {device_list}")
    for name in device_list.keys():
        getcontext().prec = 36
        device = device_list[name]
        device.write(":WAVEform:SOURCE CHANnel1")
        device.write(":WAVEform:MODE NORMAL")

        time_inc = Decimal(device.query(":WAVEform:XINCrement?"))
        y_inc = float(device.query(":WAVEform:YINCrement?"))
        y_origin = float(device.query(":WAVEform:YORigin?"))
        y_ref = float(device.query(":WAVEform:YREFerence?"))
        print(f"y_inc: {y_inc}")
        print(f"y_origin: {y_origin}")
        print(f"y_ref: {y_ref}")
        print(f"time_inc: {time_inc}")
        # device.timeout = 30000
        used_format = "ASCii"
        device.write(f":WAVEform:FORMat {used_format}")

        if used_format == "WORD" or used_format == "BYTE":
            buf = device.query_binary_values(':WAVEform:DATA?', datatype='H')
        elif used_format == "ASCii":
            buf = device.query_ascii_values(":WAVEform:DATA?")
        filename = "Rigol_Trace_{}.csv".format(name.split("::")[3])
        print(f"filename: {filename}")
        position = Decimal(device.query(":WAVEform:XORigin?").strip())

        with open(filename, 'w') as f:
            f.write("Time(s),CH1V\n")

            for point in buf:
                if point:
                    print(f"point: {point}")
                    if used_format == "WORD" or used_format == "BYTE":
                        voltage = (point - y_origin - y_ref) * y_inc
                        voltage_string = format(voltage, ".6e")
                    elif used_format == "ASCii":
                        voltage_string = format(point, ".6e")
                    
                    position_string = format(position, ".6e").replace("e-", "e-0").replace("e+", "e+0")
                    f.write(f"{position_string},{voltage_string}\n")
                    position = position + time_inc

if __name__ == "__main__":
    main()