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Black rectangular adapter with four DB9 ports and status LEDs

CoolGear

CoolGear CG-UHS4P485 4 Port USB to RS485 Adapter with 12V Power

SKU CH-DXA8-AVABQ

Adds four high-speed half-duplex RS-485 serial ports via USB 2.0 with 15 kV surge protection and a 12 V DC power supply

  • Adapter typeUSB to DB9 (RS-232)
  • Product colorBlack
  • Adds four high-speed RS-485 ports via USB
  • 15 kV surge protection on each serial port
  • LEDs show mode, status, activity and errors
  • Includes 12 V DC power adapter with locking jack
  • Virtual COM drivers for Windows 11, 10, 8.1, 8, 7, Vista, XP, 2000, Linux, Mac OS X

Four-Port RS-485 Adapter for Industrial USB

The CoolGear CG-UHS4P485 adds four high-speed half-duplex RS-485 serial ports through a single USB connection. It targets engineers and technicians who need to link factory automation equipment, barcode readers, scales, time clocks or multi-drop data collection devices to a modern PC. The adapter installs as a standard Windows COM port and includes virtual COM port drivers for Windows 11 down to 2000, Linux and Mac OS X.

Thermals Noise and Power Draw

The unit ships with a 12 VDC power adapter that uses a locking screw terminal jack for a secure connection in harsh environments. Each RS-485 port carries 15 kV surge protection to guard connected hardware against transient voltage spikes. No active cooling is fitted, so the device runs silently and draws minimal power from the external supply during normal operation.

Upgrade Path and When It Matters

This adapter replaces single-port USB-to-serial converters or legacy PCI serial cards when a project demands four independent RS-485 channels simultaneously. It also supersedes older RS-232-to-RS-485 conversion chains that introduce latency and extra points of failure. The jump is worth it when your application requires simultaneous multi-drop communication with automatic transmit buffer control and selectable echo or non-echo modes.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $116.99
Pricier than about 91% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameCoolgear
Model nameCG-UHS4P485
Product colorBlack
Adapter typeUSB to DB9 (RS-232)

Questions about this item

How do I install the CG-UHS4P485 and set the RS-485 mode correctly?

Connect the adapter to a USB 2.0 or 3.0 port, install the virtual COM port driver for Windows 11, 10, 8.1, 7, Linux or Mac OS X, then use the DIP switch to select half-duplex echo or non-echo mode before attaching 2-wire devices.

What maintenance does the adapter need and which parts might need replacement?

The 12 V DC power adapter with locking screw terminal jack and the USB cable are the only external parts that may wear out; the four RS-485 ports have 15 kV surge protection and 2 kB buffers that require no user servicing.

What is the first limit I will hit during sustained high-speed communication?

The USB 2.0 interface caps sustained throughput at 480 Mbps, so aggregate traffic across the four RS-485 ports cannot exceed that bandwidth even though each port has its own 2 kB transmit and receive buffers.

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