I am working with a project where i need to read data from my device(i.e ADAM 4520)using serial to usb converter. 1st i tested with my PC using hyper terminal and with Raspberry Pi 3 using GtkTerm,it is perfectly working. As both hyper terminal and gtkterm using ascii and my device ADAM-4520 also understand ascii,But how to communicate through python code i am not finding way as i am new to python and raspberry pi  ,please guide me. Here is my code

import serial
import time
s=serial.Serial(port='/dev/ttyS0',
                baudrate=9600,
                parity=serial.PARITY_NONE,
                stopbits=serial.STOPBITS_ONE,
                bytesize=serial.EIGHTBITS,timeout=1)
st="#04"
st=''.join(str(ord(c)) for c in st)
x=st.encode('ascii')
while True:
   s.write(x)
   print(x)
   time.sleep(0.2)
   text=s.readline()
   temp=text.decode('ascii')
   #text=text.decode('utf-8')
      #text=text[5:-1]
   print(temp)

here is my output

354852
b''
354852
b''
354852

i am receiving nothing. where as using gtkterm i am getting response.

 #04
>+261.27+310.83+049.09+206.77+126.81+049.79

#042
>+049.11

I am working with a project where I need to read data from my device(i.e ADAM 4520)using serial to USB converter. 
1st, I tested with my PC using hyper terminal and with Raspberry Pi 3 using GtkTerm, it is perfectly working. 
As both hyper terminal and gtkterm using Ascii and my device ADAM-4520 also understand Ascii, But how to communicate through python code I am not finding away as I am new to python and raspberry pi, please guide me.

Here is my code:

import serial
import time
s=serial.Serial(port='/dev/ttyS0',
                baudrate=9600,
                parity=serial.PARITY_NONE,
                stopbits=serial.STOPBITS_ONE,
                bytesize=serial.EIGHTBITS,timeout=1)
st="#04"
st=''.join(str(ord(c)) for c in st)
x=st.encode('ascii')
while True:
   s.write(x)
   print(x)
   time.sleep(0.2)
   text=s.readline()
   temp=text.decode('ascii')
   #text=text.decode('utf-8')
      #text=text[5:-1]
   print(temp)
  

Here is my output:

354852
b''
354852
b''
354852
  

I am receiving nothing. whereas using gtkterm I am getting a response.

 #04
>+261.27+310.83+049.09+206.77+126.81+049.79

#042
>+049.11