无法使用 pyserial python 脚本从串口读写

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. eg 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?

Answer 1

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

My code mentioned above is solved when serial port decrypted.