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Black steel box with eight DB9 ports and USB-A connection

SerialGear

SerialGear CS-42082 8-Port DB9 RS232 USB Converter FTDI 921.6Kbps

SKU CH-PM6S-HYTAC

Adds eight DB9 RS232 ports through one USB connection with FTDI chipset at 921.6Kbps

  • Adapter typeUSB to DB9 (RS-232)
  • Product colorBlack
  • Adds 8 RS232 ports via one USB connection
  • FTDI chip handles 75 bps to 921.6 Kbps with 512-byte FIFO
  • Steel chassis with mountable flanges for industrial use
  • Works from Windows 98 through Windows 11 plus Linux 2.6+ and Mac OS X 10.3+
  • USB or optional +5 V DC power for flexible deployment

Instant 8-Port Serial Expansion

The SerialGear CS-42082 adds eight DB9 RS232 COM ports through a single USB connection, giving PCs, thin clients and servers immediate access to legacy serial equipment. It is built for engineers and technicians who integrate barcode scanners, label printers, time clocks or point-of-sale terminals into modern systems without native serial ports.

Fanless Operation with Flexible Power

A rugged steel chassis dissipates heat silently, so the adapter runs without fans in labs, warehouses or mounted on machinery. Each port provides a 512-byte FIFO buffer and the unit draws power from the USB link or an optional +5V DC jack, letting installers choose the supply method that suits the cabinet or rack.

Replaces Internal Cards and Single-Port Dongles

This hub removes the need for PCIe serial cards or chains of individual USB-to-serial cables, saving expansion slots and reducing cable clutter. The jump is worthwhile when a workstation or server must drive multiple RS232 devices simultaneously at up to 921.6 Kbps and retain COM port assignments across reboots.

How it compares

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

Price $146.99
Pricier than about 92% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameSERIALGEAR
Model nameCS-42082
Product colorBlack
Adapter typeUSB to DB9 (RS-232)

Questions about this item

How is the 8-port DB9 RS232 adapter installed, and what step do people miss?

Connect the USB-A plug to the host, run the FTDI driver installer on Windows 10 or 11, then verify each COM port appears in Device Manager before attaching serial cables.

What maintenance or replacement will the adapter need later?

No scheduled maintenance is required; if a DB9 port or the FTDI chip fails, the entire unit must be replaced.

What limit appears first during sustained high-speed use?

Each port's 512-byte FIFO buffer and the 921.6 Kbps baud ceiling constrain continuous throughput.

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