pySerial write() won't take my string

Question

Using Python 3.3 and pySerial for serial communications.

I'm trying to write a command to my COM PORT but the write method won't take my string. (Most of the code is from here Full examples of using pySerial package

What's going on?

import time import serial   ser = serial.Serial(     port='\\\\.\\COM4',     baudrate=115200,     parity=serial.PARITY_ODD,     stopbits=serial.STOPBITS_ONE,     bytesize=serial.EIGHTBITS ) if ser.isOpen():     ser.close() ser.open() ser.isOpen()  ser.write("%01#RDD0010000107**\r") out = '' # let's wait one second before reading output (let's give device time to answer) time.sleep(1) while ser.inWaiting() > 0:     out += ser.read(40)  if out != '':     print(">>" + out)   ser.close() 

Error is at ser.write("%01#RDD0010000107**\r") where it gets Traceback is like this data = to_bytes(data) b.append(item) TypeError: an integer is required.

Answer 1

It turns out that the string needed to be turned into a bytearray and to do this I editted the code to

ser.write("%01#RDD0010000107**\r".encode()) 

This solved the problem

Answer 2

You have found the root cause. Alternately do like this:

ser.write(bytes(b'your_commands'))