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CoolGear dual-port USB-to-serial adapter with two DB-9 connectors and short cable

CoolGear

CoolGear Dual Port USB to Serial RS-232 DB-9 Adapter FTDI Chip .9m Cable

SKU CH-ACH4-46F39

Adds two RS-232 ports via one USB 2.0 connection with FTDI chipset, 921.6K bps baud rate, 15KV ESD protection and a .9m cable

  • Two RS-232 ports from one USB connection
  • FTDI chipset delivers stable serial communication
  • 6K bps baud rate for fast data transfers
  • 15KV ESD surge protection shields connected devices
  • Works with Windows, Mac OS and Linux systems

Dual-port RS-232 adapter for legacy serial devices

The CoolGear adapter adds two DB-9 ports through a single USB connection, targeting technicians and integrators who need to connect modems, industrial equipment, POS hardware or older peripherals to modern computers. It installs as standard COM ports on Windows, macOS and Linux without requiring IRQ, DMA or I/O resource configuration.

USB 2.0 High Speed interface limits throughput

The device operates on the USB 2.0 High Speed bus, so aggregate serial traffic cannot exceed that bandwidth. Each port supports baud rates up to 921.6K bps with full modem control signals and hardware or software flow control, but the shared USB link remains the bottleneck for simultaneous high-speed streams.

FTDI chipset with 15KV ESD protection on every

The FTDI controller provides stable driver support across operating systems and protects each RS-232 signal line against 15KV electrostatic discharge events. Buyers who need galvanic isolation, more than two ports or a locking USB connector will not find those features here.

How it compares

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

Price $33.99
Pricier than about 90% of the 1,430 comparable items (median $14.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Should I pick the single-port or dual-port version of this adapter?

This model is the dual-port version; it adds two RS-232 DB-9 ports from one USB connection.

What does the 921.6K bps headline speed mean when the adapter is running inside my computer?

Each serial port can transfer data at up to 921.6K bps, while the USB 2.0 link to the host handles up to 480Mbps.

Which USB standard does the .9m cable use, and what throughput does that cap in practice?

The cable is USB 2.0 High Speed, so the link to the PC is limited to 480Mbps.

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