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Black rectangular USB to RS232 adapter with four green and red LEDs and DB9 port

CoolGear

CoolGear CG-4URS232A 4 Port USB 2.0 to RS232 Auto Switch FTDI Chipset

SKU CH-R43D-66S38

A four-port USB 2.0 to RS-232 auto-switch with FTDI chipset lets four computers share one DB9 serial port using first-come-first-served or manual control

  • ColorBlack
  • Connect four computers to one serial port via auto-switching
  • FTDI chipset ensures reliable RS-232 communication at over 250K bps
  • ±15 kV ESD protection safeguards connected equipment
  • Plug-and-play installation with USB 1.1, 2.0, 3.0 and 3.1 compatibility
  • Green and red LEDs show port selection and data activity

Four-port RS-232 sharing adapter

The CoolGear CG-4URS232A lets up to four computers share one DB9 serial port through a USB 2.0 connection. Each port uses an FTDI chipset for reliable RS-232 communication. The unit is aimed at technicians and engineers who need to manage multiple legacy devices from a single serial interface.

Replaces manual cable swapping

Instead of physically moving a serial cable between machines, the adapter switches automatically on a first-come-first-served basis with a five-second timeout. A manual mode is also available for controlled access. The upgrade is worthwhile when workflows require frequent, unattended switching between several hosts and one serial peripheral.

Driver-free installation on major OSes

The device is plug-and-play on Windows 98 through Windows 10, Mac OS 8.6 and later, and Linux. No external power supply is needed; it draws 5 V from the USB bus. The only common issue is ensuring the host USB port supplies enough current for all four channels simultaneously.

Highlights

  • Connect four computers to one serial port via auto-switching
  • FTDI chipset ensures reliable RS-232 communication at over 250K bps
  • ±15 kV ESD protection safeguards connected equipment
  • Plug-and-play installation with USB 1.1, 2.0, 3.0 and 3.1 compatibility
  • Green and red LEDs show port selection and data activity

Specifications

BrandCoolgear
ModelCG-4URS232A
ColorBlack

Questions about this item

What are the exact dimensions of the CG-4URS232A so I can check if it fits in my rack?

The unit measures 72 mm wide, 51 mm deep and 24 mm high, weighing 60 g.

Which driver package is required for the FTDI chipset on Windows 10, and where is the DIP switch for manual mode?

Windows 10 uses the built-in FTDI driver; no separate package is needed. Slide the mode switch to Manual before powering on, then use the front button to select the active port.

The green and red LEDs show port status — what does each colour mean and when should I replace the unit?

Green means the PC is selected; red blinks during TXD data transfer. Replace the adapter if LEDs stay dark with a known-good cable and power, or if ESD events exceed the rated ±15 kV protection.

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