CODEWITHSUNDEEP
pythonpyserial
Garvin
Garvin

Reputation: 935

pySerial write() won't take my string

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.

Upvotes: 28

Views: 195081

Answers (3)

Murphy Meng
Murphy Meng

Reputation: 237

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

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

Upvotes: 10

user3577539
user3577539

Reputation: 21

I had the same "TypeError: an integer is required" error message when attempting to write. Thanks, the .encode() solved it for me. I'm running python 3.4 on a Dell D530 running 32 bit Windows XP Pro.

I'm omitting the com port settings here:

>>>import serial

>>>ser = serial.Serial(5)

>>>ser.close()

>>>ser.open()

>>>ser.write("1".encode())

1

>>>

Upvotes: 2

Garvin
Garvin

Reputation: 935

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

Upvotes: 45

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