[Python] CAS-5200A returns null data via ADAM-4561 in Python despite correct connection...

I have CAS-5200A and ADAM 4561 and ADAM 4521, and I must get data from CAS with ADAM in python. But get data null.

import serial
import time

ser = serial.Serial(
port='COM3', # Confirmed correct port in Device Manager
baudrate=9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
timeout=1
)

try:
command = b"#01\r\n" # Command format from CAS-5200A manual
ser.write(command)
time.sleep(0.1)
response = ser.read_all()
print(f"Received: {response}") # Always shows empty response

except Exception as e:
print(f"Error: {e}")
finally:
ser.close()

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