Industrial USB to Serial Adapters | RS232 RS422 RS485 | COM Port Retention

8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection Adapter Isolation
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
8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection Adapter Isolation
Multi-Standard Series
8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection Adapter Isolation
CAN BUS
8-Port Terminal Block RS232/422/485 to USB Adp – ISO/Surge Protection Adapter Isolation
Serial Over Ethernet
RS232 to USB Adapter with Terminal Block SA-8PX-IS Rugged 8-Port Terminal Block RS-232, RS-422, RS-485 USB 2.0 to Serial Converter is an ideal expansion adapter with an industrial…

Model# SA-8PX-IS

$434.29

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USB to Serial Adapter with Terminal Block Providing scalability this industrial grade USB to 8-Port Terminal Block serial adapter supports serial port data transfer rates…

Model# SA-8PXTB

$358.29

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PCI Express Adapter The SG-PCIE8SRS422485MODIS Isolated 8 Port PCI Express Module provides instant RS232, RS422, and RS485 serial port expansion via the PCI Express bus to…

Model# SG-PCIE8SRS422485MODIS

$659.99

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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.