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Compact USB-to-serial adapter with DB9 connector, matte black finish

Brainboxes

Brainboxes US-101 USB 1 Port RS232 1MBaud network card

SKU CH-16S0-ANXSK MPN US-101

Adds a single RS232 serial port to a computer via USB at up to 1 Mbaud

  • Weight0.1500
  • Single USB port adds one RS-232 serial connection
  • 1 MBaud maximum data rate for legacy equipment
  • Lightweight 0.15 kg design fits tight enclosures
  • Brainboxes engineering for industrial reliability
  • New condition, first listed August 2026

USB RS232 adapter for legacy serial devices

The Brainboxes US-101 adds a single RS232 port through a USB connection. It supports baud rates up to 1 Mbaud for reliable data transfer. Industrial engineers and technicians use it to connect older PLCs, meters or console ports to modern laptops that lack native serial ports. The adapter is powered directly from the USB bus.

Replaces internal serial cards and bulky USB hubs

This device removes the need for a PCI or PCIe serial card inside a chassis. It also avoids the cable clutter of multi-port hubs when only one RS232 link is required. The upgrade makes sense when deployment speed matters or when the host machine has no free expansion slots. Driver support covers current Windows and Linux kernels.

Fits any USB-A port without external power

The dongle weighs 0.1500 kg and draws all power from the host USB port. No separate supply or AC adapter is needed, freeing a mains socket on crowded benches. Its compact form leaves adjacent USB ports accessible. The 1 Mbaud ceiling suits most industrial protocols but does not serve applications that demand higher throughput.

Highlights

  • Single USB port adds one RS-232 serial connection
  • 1 MBaud maximum data rate for legacy equipment
  • Lightweight 0.15 kg design fits tight enclosures
  • Brainboxes engineering for industrial reliability
  • New condition, first listed August 2026

Specifications

BrandBrainboxes
ModelUS-101
Weight0.1500
Shipping weight0.07 kg
Package size157 × 137 × 102 mm

Questions about this item

What USB connector does the US-101 need on the host?

The US-101 plugs into any standard USB port on the host computer.

Which driver step is often missed when installing the US-101?

Install the Brainboxes driver package before connecting the US-101 so the virtual COM port appears correctly.

What upkeep does the US-101 require over time?

No routine maintenance is needed; the unit has no moving parts or consumable components.

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