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Short USB cable with DB9 serial connector and thumbscrews

StarTech.com

STARTECH USB to Null Modem Serial Adapter Cable 30cm

SKU CH-VHPG-YAR66

Connects a null-modem serial device to a USB port with a 30 cm cable and two DB9 screws

  • Connect legacy serial gear via USB
  • 30 cm cable keeps workspaces tidy
  • Null modem wiring links two DTE devices directly
  • Two DB9 screws secure each connection
  • Quick-start guide gets you running fast

What this adapter does

The StarTech cable converts a USB port into a DB9 serial connection using a null-modem pinout. It is built for technicians and engineers who need to configure routers, switches or industrial equipment that only accept a serial console.

Practical limits of the USB-serial link

The 30 cm length restricts placement to immediately beside the host computer. Throughput is bound by the USB-serial bridge chip, so high-speed bulk transfers are not realistic. The DB9 screws provide a secure fit but the short tail offers no strain relief for heavy panel-mounted ports.

Installation notes

Driver installation is required on most operating systems before the virtual COM port appears. The quick-start guide covers the basic steps but does not address unsigned-driver warnings on newer Windows releases. The moulded strain relief is minimal, so repeated connect-disconnect cycles can fatigue the cable at the USB plug.

How it compares

Measured against everything we stock in Other Adapters & Couplers, at today’s prices. Recalculated every night.

Price $27.99
Pricier than about 74% of the 1,755 comparable items (median $18.99).

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Specifications

Product
Brand nameStarTech
Size & build
Shipping weight2.34 kg
Package size310 × 241 × 119 mm

Questions about this item

Should I choose the 30 cm length for my serial setup?

The 30 cm cable keeps the USB-to-DB9 link short and tidy, reducing clutter when connecting a DCE serial device directly to a laptop or desktop port.

What does the USB to Null Modem Serial Adapter actually do inside my computer?

It presents a virtual COM port so legacy DCE equipment such as routers, switches or industrial gear can be managed through a standard USB socket without an internal serial card.

Which USB standard does this adapter use and what throughput can I expect?

The adapter uses a standard USB interface; the practical throughput is limited by the serial device's own baud-rate setting rather than the USB link itself.

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