Some code to get waveforms from my Tektronix TDS 2012

tektronix.py

import serial
import struct
import time
ser = serial.Serial(port='/dev/ttyUSB0', baudrate=19200, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, bytesize=serial.EIGHTBITS)

def cmd(s):
    ser.write(s)
    ser.write(b"\r\n")
    time.sleep(0.1) # *shrug*

def setup():
    cmd("DATA:WIDTH 1")
    cmd("DATA:ENCDG SRI")
    cmd("DATA:START 1")
    cmd("DATA:STOP 2500")

def get_ch(ch=1):
    ser.timeout = 2
    ser.flushInput()
    cmd(b"DATA:SOURCE CH"+str(ch).encode('utf-8'))
    cmd(b"WFMPRE?")
    preamble = ser.read_until(b'\r').decode('utf-8').strip().split(';')
    cmd(b"CURVE?")
    ser.read(1)
    len = int(ser.read(1))
    len = int(ser.read(len))
    data = ser.read(len)
    ser.read(1)

    return {
            'pairs': preamble[7] == 'ENV',
            'xincr': preamble[8],
            'xzero': preamble[10],
            'xunit': preamble[11][1:-1],
            'ymult': preamble[12],
            'yzero': preamble[13],
            'yoffs': preamble[14],
            'yunit': preamble[15][1:-1],
            'data':  struct.unpack(str(len)+'b', data)
            }

def pairs(d):
    out = "# " + d['xunit'] + ", " + d['yunit'] + "\n"
    x0 = float(d['xzero'])
    dx = float(d['xincr'])
    y0 = float(d['yzero'])
    ys = float(d['ymult'])
    yo = float(d['yoffs'])

    if d['pairs']:
        for index, value in enumerate(zip(*[iter(d['data'])]*2)):
            x = x0 + 2 * dx * index
            y1 = (value[0] - yo) * ys + y0
            y2 = (value[1] - yo) * ys + y0

            out += '{:< #10.4g} {:< #10.4g} {:< #10.4g}\n'.format(x, y1, y2)
    else:
        for index, value in enumerate(d['data']):
            x = x0 + dx * index
            y = (value - yo) * ys + y0

            out += '{:< #10.4g} {:< #10.4g}\n'.format(x, y)

    return out

if __name__ == '__main__':
    print(pairs(get_ch()))