[Python] Unable to Receive Data via Serial Communication on Raspberry Pi/PC with ACC220 Module

I’m working on a project where I need to send and receive data via a serial connection using the ACC220 USB-to-serial module. I have a simple sender-receiver setup using Python and PySerial to transmit data from one device (Raspberry Pi/PC) to another, but I can’t get the receiver to work.

The sender successfully prints "Sent: Hello from sender" every second, indicating that data is being sent. The receiver is not receiving any data, even though the sender is printing the "Sent" message every second. Wiring:

TX (sender) → RX (receiver)

RX (sender) → TX (receiver)

GND → GND between devices.


Receiver (Laptop)

import serial

PORT = "COM5"
BAUDRATE = 9600

ser = serial.Serial(PORT, BAUDRATE, timeout=1)
print(f"Listening on {PORT} at {BAUDRATE} baud...")

while True:
data = ser.readline().decode().strip()
if data:
print(f"Received: {data}")
else:
print("No data received.")


Sender (Pi5)

import serial
import time

PORT = "/dev/serial0"
BAUDRATE = 9600

ser = serial.Serial(PORT, BAUDRATE)
print(f"Sending data on {PORT} at {BAUDRATE} baud...")

try:
while True:
ser.write(b"Hello from sender\n")
print("Sent: Hello from sender")
time.sleep(1)
except KeyboardInterrupt:
print("\nStopping sender.")
ser.close()


I’ve tried using a serial monitor (PuTTY) to test if data is coming through COM5, but still no luck.

I have alredy checked wiring: TX to RX and RX to TX. Ensured baud rate, parity, and other serial settings match. Verified that the serial port is not being blocked by any other application.

I’ve tried everything I can think of and still can’t get the receiver to work. Any help on what I’m missing?

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