[SOLVED] How to read and write from a COM port using PySerial?

How to read and write from a COM port using PySerial?

I have Python 3.6.1 and PySerial installed. I am able to get a list of COM ports connected. I want to send data to the COM port and receive responses:

import serial.tools.list_ports as port_list
ports = list(port_list.comports())
for p in ports:
    print (p)

Output:

COM7 - Prolific USB-to-Serial Comm Port (COM7)
COM1 - Communications Port (COM1)

From PySerial documentation:

>>> import serial
>>> ser = serial.Serial('/dev/ttyUSB0')  # open serial port
>>> print(ser.name)         # check which port was really used
>>> ser.write(b'hello')     # write a string
>>> ser.close()             # close port

I get an error from ser = serial.Serial('/dev/ttyUSB0') because '/dev/ttyUSB0' makes no sense in Windows. What can I do in Windows?

Solution

This could be what you want. I'll have a look at the docs on writing. In windows use COM1 and COM2 etc without /dev/tty/ as that is for unix based systems. To read just use s.read() which waits for data, to write use s.write().

import serial

s = serial.Serial('COM7')
res = s.read()
print(res)

you may need to decode in to get integer values if thats whats being sent.