虚拟串口COM5权限错误：环回通信读写脚本无法同时运行求助

我使用两个基础测试脚本（读脚本、写脚本）通过虚拟串口实现环回通信：读脚本处于while循环中持续接收字节，写脚本运行时发送单个字节。通过VSPD（虚拟串口驱动）创建的COM5串口搭建环回环境，但遇到权限问题：

• 读脚本可以正常连接并打开COM5端口
• 写脚本尝试打开COM5写入时，抛出以下错误：

serial.serialutil.SerialException: could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5)

已尝试的排查操作：

• 在设备管理器中禁用并重新启用该串口
• 重启VSPD驱动程序
• 重启电脑
  通过VSPD监控可以看到串口正常开闭；当读脚本未运行时，写脚本能够正常发送字节。

写脚本代码 #

# Serial write Script

import serial

# Configure the serial port
ser = serial.Serial(
    port='COM5',
    baudrate=9600,
    bytesize=serial.EIGHTBITS,  # 8 bits per byte
    parity=serial.PARITY_NONE,  # No parity
    stopbits=serial.STOPBITS_ONE,  # 1 stop bit
    timeout=0.5  # Timeout in seconds
)

# Send a byte
byte_to_send = b'\x41'  # Example byte to send (here, ASCII 'A')

ser.write(byte_to_send)
print(f"Sent byte: {byte_to_send}")

# Close the serial port
ser.close()

读脚本代码 #

#Serial read script

import serial
import time

# Configure the serial port
ser = serial.Serial(
    port='COM5',
    baudrate=9600,
    bytesize=serial.EIGHTBITS,  # 8 bits per byte
    parity=serial.PARITY_NONE,  # No parity
    stopbits=serial.STOPBITS_ONE,  # 1 stop bit
    timeout=0.5  # Timeout in seconds
)

try:
    while True:
      
        # Read a byte
        byte_received = ser.read(1)  # Read one byte
        print(f"Received byte: {byte_received}")
        
        # Optional: Add a small delay to reduce CPU usage
        time.sleep(0.1)  # Adjust as needed

except KeyboardInterrupt:
    print("Interrupted")
finally:
    # Ensure the serial port is properly closed
    if ser.is_open:
        ser.close()
        print("Serial port closed")

VSPD配置界面 #

内容的提问来源于stack exchange，提问作者Fisch