Industrial USB to Serial Adapters | RS232 RS422 RS485 | COM Port Retention
RS-232
USB to Serial RS232, 422, 485 Adapter with DIP Switch
RS-422
USB to 4 port RS-422 485 Optically Isolated Adapter
RS-485
Multi-Standard Series
CAN BUS
Serial Over Ethernet
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FAQ: Common USB to Serial Adapter Questions

Q: What is COM Port Retention and why do I need it?
A: COM Port Retention ensures that your assigned COM port number remains the same every time you plug in the adapter or reboot your PC. This prevents software communication errors and eliminates the need to manually reconfigure your application settings whenever hardware is moved.

Q: Can I use these adapters with Windows 11?
A: Yes, all Coolgear Serial adapters use modern FTDI or Silabs chipsets with WHQL-certified drivers for full Windows 11, Mac, and Linux support.

Q: What is the difference between an isolated and non-isolated serial adapter?
A: Isolated adapters use optical barriers to physically separate the electrical signals. This protects your computer from 2,500V surges and ground loops common in factory environments.

Q: Do these adapters require an external power supply?
A: Most of our single and dual-port models are USB bus-powered. High-density rackmount models (8-port+) feature integrated or external power supplies for maximum signal integrity.