Not able to write and read from serial port using pyserial python script

Question

I want to write to serial port to embedded micro-controller,

I am using serial to USB converter.

My code is as below (Sample code):

import serial
import time

ec = serial.Serial('COM2', baudrate=57600)

print(ec.isOpen())

cmd=str(input('cmd >> '))

ncmd = cmd+'\r\n'

ec.write(ncmd.encode())

time.sleep(2)

data = ec.read_all()

time.sleep(1)

print(data)

ec.close()

if ec.close():
    print('port closed')**

But every time I run code with some command I do not get expected output. e.g. If I send command '4', it is expected that it should read all error data from controller. But instead it gives following empty message;

True
cmd >> 4
b''

Could anyone please help? Where am I doing something wrong?

I am not aware about source code of controller. But when I user tera term and send cmd 4 and get the expected output. — Ravi Shrikhande
I would also assume a mistake in line termination/protocol. Please print the repr of your ncmd and show this to us. — deets
Hi..working it now. Actually port was encrypted. Now it working when using another decrypted port. thanks @Z4-tier and Nullman — Ravi Shrikhande

Ravi Shrikhande Ravi Shrikhande · Accepted Answer · 2020-01-08T09:36:44

Before accessing any serial port make sure that serial port is not encrypted.

My code mentioned above is solved when serial port decrypted.

Not able to write and read from serial port using pyserial python script

1 Answers