![COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center](https://support.arduino.cc/hc/article_attachments/360016532000/COM_port_changes_2.png)
COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center
![Error, cannot bind to the specified serial port \\.\com3. · Issue #33 · Slamtec/rplidar_sdk · GitHub Error, cannot bind to the specified serial port \\.\com3. · Issue #33 · Slamtec/rplidar_sdk · GitHub](https://user-images.githubusercontent.com/13358789/77055380-bdd10c80-6a0b-11ea-922d-daa37868fe1d.png)
Error, cannot bind to the specified serial port \\.\com3. · Issue #33 · Slamtec/rplidar_sdk · GitHub
Network Serial Port Kit - Share and access any serial devices or create virtual null-modem cables over a TCP/IP network or the Internet.
![Using serial ports as of COM3 for ProTool project transfer from the PC to the panel - ID: 13396821 - Industry Support Siemens Using serial ports as of COM3 for ProTool project transfer from the PC to the panel - ID: 13396821 - Industry Support Siemens](https://support.industry.siemens.com/cs/images/13396821/13396821_freischalten_der_com-ports_in_pt_02_e.gif)
Using serial ports as of COM3 for ProTool project transfer from the PC to the panel - ID: 13396821 - Industry Support Siemens
![COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center COM port number changes when connecting board on different ports or in bootloader mode – Arduino Help Center](https://support.arduino.cc/hc/article_attachments/360016531980/COM_port_changes_3.png)