Features:
USB Type-C PD Chargers
USB Type-A Chargers
Multi-Port USB Chargers
Integration-Ready Charging PCBAs
COM Port Retention
COM Ports are fully configurable, and after reboots and disconnections, all port assignments are preserved.
Bring Legacy Up to Date
Connect legacy serial equipment to your modern hardware with USB-A and USB-C connection capabilities.
Wide Compatibility
Find serial adapters in RS-232, RS-422, RS-485, and CAN BUS standards. OS Support covers Windows 11 to mac and Linux.
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Serial Products
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Name | Model No. | Description | Serial Ports | Baud Rate | Serial Standards | MSRP | ||
|---|---|---|---|---|---|---|---|---|
| RS-232 | 128 Bytes Receive | 256 Bytes Transmit | FTDI
Expand Your Serial Capabilities: The Mini Serial Adapter can… Read More | 1 | 921.6K bps | RS232 | $27.29 | |||
| RS-232 | 512 Bytes Receive | 512 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect your legacy 9-pin serial device… Read More | 1 | 921.6K bps | RS232 | $29.29 | |||
| RS-232 | 512 Bytes Receive | 512 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect your legacy 9-pin serial device… Read More | 1 | 921.6K bps | RS232 | $29.29 | |||
| RS-232 | 128 Bytes Receive | 256 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect your legacy 9-pin serial device… Read More | 1 | 921.6K bps | RS232 | $22.99 | |||
 | RS-232 | 128 Bytes Receive | 384 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with built in… Read More | 2 | 921.6K bps | RS232 | $103.29 | |||
 | Expand Your Serial Capabilities: Connect your legacy serial device through a USB-A port to add legacy functionality to newer technologies… Read More | 1 | 921.6K bps | RS232 | $58.99 | |||
| RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect 2 legacy 9-pin serial… Read More | 2 | 921.6K bps | RS232 | $52.99 | |||
 | RS-232 | 512 Bytes Receive | 512 Bytes Transmit | FTDI
Superior Build Quality: Housed in a rugged steel chassis with… Read More | 1 | 921.6K bps | RS232 | $46.49 | |||
 | RS-232 | FTDI
Expand Your Serial Capabilities: Connect your legacy 9-pin serial devices through a USB-A port to add legacy… Read More | 4 | 921.6K bps | RS232 | $103.99 | |||
 | RS-232 | 384 Bytes Receive | 128 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with optional… Read More | 4 | 921.6K bps | RS232 | $117.49 | |||
| RS-232 | 4096 Bytes (4 KB) Receive | 4096 Bytes (4 KB) Transmit | FTDI
Expand Your Serial Capabilities: The… Read More | 2 | 921.6K bps | RS232 | $68.99 | |||
 | RS-232 | 512 Bytes Receive | 512 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with built in… Read More | 1 | 921.6K bps | RS232 | $114.99 | |||
 | RS-232 | RS-422 | RS-485 | 2,000 Bytes Receive | 2,000 Bytes Transmit
Superior Build Quality: Housed in a rugged steel… Read More | 4 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $269.29 | |||
 | USB to Serial Adapter for Bar code Scanners
The USBG-COM-X is compact, (only slightly longer than a pen cap) and adds… Read More | 1 | 921.6K bps | RS232 | $34.49 | |||
 | 15KV ESD and 600W Surge Protection for RS-232/422/485 Ports
Our series of Industrial USB 2.0 to terminal block serial adapters supports… Read More | 8 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $325.99 | |||
 | Serial USB Adapter - Full RS232 Modem Control
The USB-32COM-RM USB to 32 Port RS-232 Serial Adapter is designed for industrial applications… Read More | 32 | 1Mbps | RS232 | $706.49 | |||
 | RS-232 | 512 Bytes Receive | 512 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with optional mountable… Read More | 16 | 921.6K bps | RS232 | $422.99 | |||
 | RS-232 | 128 Bytes Receive | 384 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with built in… Read More | 8 | 921.6K bps | RS232 | $227.99 | |||
 | RS-422 | RS-485 | 384 Bytes Receive | 128 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis… Read More | 2 | 921.6K bps | RS422 ⋅ RS485 | $221.99 | |||
| Optical Isolation and Surge Protection for RS-232/422/485 Ports
The USB2-8COMi-SI-TB is a USB 2 to 8-port industrial serial adapter that protects… Read More | 8 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $434.99 | |||
 | Terminal block serial adapter for RS-232/422/485
Our series of Industrial USB 2.0 to terminal block serial adapters support RS-232, RS-422, and… Read More | 4 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $204.29 | |||
 | USB to RS232 Cable Windows 11
The USBG-4X2FTDI 4-Port USB DB-9 Serial Adapter is a rugged plastic USB to Serial adapter that allows you… Read More | 4 | 921.6K bps | RS232 | $79.99 | |||
 | USB to RS232 Adapter - DB9 Male Ports
The USBG-BAY4 is a 4 port DB-9 RS232 to USB serial adapter that… Read More | 4 | RS232 | $147.49 | ||||
| RS-232 | 512 Bytes Receive | 512 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with built in… Read More | 4 | 921.6K bps | RS232 | $287.29 | |||
 | RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect 8 legacy 9-pin serial… Read More | 8 | 921.6K bps | RS232 | $209.49 | |||
 | FTDI USB to Serial Adapter with Switching Power Supply
Industrial Grade Rack Mount 8 Port USB RS-232, RS-422, RS485 Octal Serial… Read More | 8 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $439.99 | |||
| RS-232 | 512 Bytes Receive | 512 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with optional mountable… Read More | 8 | 921.6K bps | RS232 | $209.99 | |||
 | USB to RS232 Adapter - FTDI FT232RL Chipset
The 4X232P1 USB 2.0 to Quad Serial Adapter features our USB 4-Port serial… Read More | 4 | 921.6K bps | RS232 | $133.29 | |||
 | USB to Serial Adapter - DIN Rail Mount
The USB-16COM-RM is a 16 Port RS-232 industrial style USB to Serial adapter, which… Read More | 16 | 921.6K bps | RS232 | $491.99 | |||
 | RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI
Expand Your Serial Capabilities: Connect 4 legacy 9-pin serial… Read More | 4 | 921.6K bps | RS232 | $116.29 | |||
 | USB to RS232 Adapter - FTDI Chipset
For computer users that require one new or additional RS-232 connection without the extra cable length… Read More | 1 | 921.6K bps | RS232 | $34.29 | |||
 | USB C to RS232 Adapter - 6ft. Cable
The USBGear 6ft. USB C to RS-232 Serial Adapter features a new black ultra sleek… Read More | 1 | 921.6K bps | RS232 | $29.49 | |||
 | RS485 to USB Adapter Auto Transmit
A 4-Port RS-422, RS-485 adapter for serial communication that utilizes four external DIP switches for easy… Read More | 4 | RS422 ⋅ RS485 | $211.99 | ||||
 | Serial to USB Multi-Protocol Adapter
This 2-Port serial adapter supports the use of one or two serial protocols simultaneously making it… Read More | 2 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $106.99 | |||
 | USB to RS232 Adapter - 2500Vrms Isolation
Industrial 8-Port DB-9 RS232 to USB Adapter to add eight new or additional serial… Read More | 8 | 921.6K bps | RS232 | $430.29 | |||
| USB to RS232 Adapter with FTDI and Isolation
The USBG-SSRS1 single port USB RS-232 Adapter fully compatible with USB 1.1 and… Read More | 1 | RS232 | $95.29 | ||||
 | USB to Serial Adapter - High Speed Prolific Chipset
USB DB-9 Serial 72 inch RS-232 Adapter cable for connecting to serial devices… Read More | 1 | 921.6K bps | RS232 | $33.99 | |||
 | RS232 to Ethernet - Two Port Adapter
The MSD-SRF2X Dual port RS-232 to Ethernet data gateway will address the need to… Read More | 2 | 115.2K bps | RS232 | $197.99 | |||
| RS-232 | 256 Bytes Receive | 128 Bytes Transmit
Superior Build Quality: Housed in a rugged steel chassis with built in… Read More | 2 | 921.6K bps | RS232 | $157.99 | |||
 | USB to RS232 Industrial Serial Adapter
Compact Industrial RS232 Serial Adapter bringing 4 DB9 RS232 Ports from one simple connection. Helps… Read More | 4 | 921.6K bps | RS232 | $117.49 | |||
 | USB to Serial Adapter for RS422 and RS485 Applications
The USB-4COMi-SI-M is a USB to Quad RS-422 485 Optical isolated serial… Read More | 4 | RS422 ⋅ RS485 | $409.49 | ||||
 | Adds one RS-232, or RS-422, or RS-485 serial port via USB connection.
Software configuration for easy RS-232, RS-422, RS-485 mode… Read More | 1 | RS232/RS422/RS485 | $107.99 | ||||
| The MSD-SRF4XV2 provides seamless connectivity for RS-232, RS-422, and RS-485 serial devices over Ethernet, making it ideal for integrating PLCs… Read More | 4 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $249.95 | |||
| RS-232 | RS-422 | RS-485
Safe Connections: Designed for use with Bar Code Scanners, Time Clocks, Label Printers, Point of… Read More | 1 | 921.6K bps | RS232 ⋅ RS422 ⋅ RS485 | $142.49 | |||
 | USB C to Serial RS232 for Windows COM Port
Synchronize your PDA, Digital Camera, Cell Phone or other device currently using… Read More | 1 | 921.6K bps | RS232 | $27.29 | |||
 | USB Console Cable for Network Consoles
A combination of two cables make up this USB to Serial RJ45 console cable giving… Read More | 1 | RS232 | $27.99 |
Common USB to Serial Adapter Questions
What is COM Port Retention and why do I need it?
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.
Can I use these adapters with Windows 11?
Yes, all Coolgear Serial adapters use modern FTDI or Silabs chipsets with WHQL-certified drivers for full Windows 11, Mac, and Linux support.
What is the difference between an isolated and non-isolated serial adapter?
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.
Do these adapters require an external power supply?
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.