gistfile1.py

import requests
import pyserial
import time
def normalizeData(text):
    lines = []
    for line in text.split('\n'):
        lines.append(line)
    data = ''
    for line in lines:
        data += line
    return data

data = requests.get('http://www.modelmania.com.pl/test_drukarka.txt').text
data = normalizeData(data)
dev = serial.Serial('/dev/ttyUSB0', 19200, timeout=1)
dev.write("$05")
print(dev.read(1024**2))