How to read COM Port output after entering input

Question

I am using python and pyserial to control LED Lights (green, yellow and red)

That's how initialize my serial port:

def initComPort():
    serialPort = serial.Serial(
        port="COM3", baudrate=9600, bytesize=8, parity='N', stopbits=serial.STOPBITS_ONE, xonxoff=0
    )
    return serialPort

Whenever I want to set the first light to green I use this:

def gLight():
    initComPort().write(str.encode('WR10000\r'))

Now I want to get the current status, like, what light is turned on by using the following information click here

Now, when using Putty and entering RD with a Return I get "10000"

But I am not able to recreate this in Python, I tried using this but the code always seems to wait at that readline() function:

def getState():
    initComPort().write(str.encode('RD\r'))

    print('Write command sent!')
    out = ' '
    time.sleep(1)
    out += initComPort().readline()
    print (">>" + out)

Using read(5) did not solve my problem either, what am I doing wrong?

Answer 1

Seems like whenever I use

initComPort().write(str.encode('RD\r'))

I am creating a new serial variable or something like that

so I tried using this instead while encoding the byte output into string, and now its working!

    test = initComPort()
    test.write(str.encode('RD\r'))

    print('Write command sent!')
    out = str(test.readline())
    print (out)

    kek.close()