I just got a RPI zero w and I want to communicate to a device through serial comm. I also have a MAX232 board and a RS232 TTL converter. I want to use one of this boards to be able to communicate with that device because of what I red I can't dirrectly use the RPI's serial pins to add parity bits wich I need. I have tryed many thing to get this to work but it seems something I'm doing is wrong and can't figure it out. The code is in python and works great if I use a USB serial converter.

import time
import serial
import binascii
import re

ser = serial.Serial(
    port = '/dev/ttyAMA0',
    baudrate = 19200,
    parity = serial.PARITY_MARK,
    stopbits = serial.STOPBITS_ONE,
    bytesize = serial.EIGHTBITS,
    timeout = 2

while True:
        print("Connected to: " + ser.name)
        counters = [0x01,0x0F]

        a = ser.read(30)
        state = binascii.hexlify(a)
        asd = re.sub(rb'([0-9, a-z, A-Z])(?!$)', rb'\1,', state)

So that's the code I'm using and I don't get any data back.

These are the connections I made

I'm a beginner to all this stuff but I hope someone could help me make this work.

  • Run ./monitor.py 14 15 to see if there is any activity on the serial link.
    – joan
    Commented Feb 2, 2020 at 18:42
  • I'm sorry but I don't know to configure that module. It gives me and error that it can't connect to that port
    – X Tzevu
    Commented Feb 2, 2020 at 20:17
  • It requires the pigpio daemon to be running, sudo pigpiod to start the pigpio daemon.
    – joan
    Commented Feb 2, 2020 at 21:09
  • I did run ./monitor.py 14 15 and it does nothing, just hangs in there.
    – X Tzevu
    Commented Feb 3, 2020 at 6:37
  • That indicates nothing is being sent or received. Did you run your program after starting monitor.py ?
    – joan
    Commented Feb 3, 2020 at 7:29

1 Answer 1


The RS232 converter works great aswell powered from the 3.3V on the RPI 2B. I'll get another pi zero in the future and hopefully don't burn it. Thank you for your help @joan

  • Please accept your own answer with a click on the tick on its left side. Only this will finish the question and it will not pop up again year for year.
    – Ingo
    Commented Feb 7, 2020 at 9:33

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