Python-сообщество

 import serial
conn = serial.Serial()
conn.port = "/dev/ttyUSB0"
conn.baudrate = 115200
conn.bytesize = serial.EIGHTBITS #number of bits per bytes
conn.parity = serial.PARITY_NONE #set parity check: no parity
conn.stopbits = serial.STOPBITS_ONE #number of stop bits
conn.timeout = None          #block read
#conn.timeout = 1            #non-block read
#ser.timeout = 2              #timeout block read
conn.xonxoff = False     #disable software flow control
conn.rtscts = True     #disable hardware (RTS/CTS) flow control
conn.dsrdtr = True       #disable hardware (DSR/DTR) flow control
#conn.writeTimeout = 2     #timeout for write
conn.open()
conn.write(b'\x01\x25\x21\x26\x00\x05\x00\x00\x37\x31\x03') #Строка, которую надо отправить на принтер

 import usb.core
import usb.util
dev = usb.core.find(idVendor=0x067b, idProduct=0x2303)
 # was it found?
 if dev is None:
    raise ValueError('Device not found')
 s=b'\x01\x25\x21\x26\x00\x05\x00\x00\x37\x31\x03'
reattach = False
if dev.is_kernel_driver_active(0):
    reattach = True
    dev.detach_kernel_driver(0)
    dev.set_configuration()
 
# get an endpoint instance
cfg = dev.get_active_configuration()
intf = cfg[(0,0)]
ep = usb.util.find_descriptor(
    intf,
#match the first OUT endpoint
    custom_match = \
lambda e: \
    usb.util.endpoint_direction(e.bEndpointAddress) == \
    usb.util.ENDPOINT_OUT)
    
ep.write(s)