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Black rectangular USB-B to DB9 adapter with four serial ports

Tripp Lite

Tripp Lite U208-004-IND USB converter 4 port RS422/485

SKU CH-YYQZ-HR2PY MPN U208-004-IND

Adds four RS-422/485 serial ports to a PC, Mac or Linux system via USB with automatic mode switching and per-port DIP-switch configuration

  • First connector1 x USB-B Female
  • Second connector4 x DB9 Male
  • Product typeUSB-B to DB9 F/M
  • Product colorBlack
  • Key featuresAuto-detects and -switches RS-422 and RS-485 serial devices
  • Connect four serial devices simultaneously via four DB9 ports
  • Auto-detects and switches between RS-422 and RS-485 protocols
  • Independent DIP switches allow easy per-port configuration
  • Automatically reassigns COM port values to avoid manual setup
  • Compact external design measures 6.8 inches wide by 0.9 inches high

Industrial USB-to-serial converter

The Tripp Lite U208-004-IND connects up to four RS-422 or RS-485 serial devices to a single USB-B host port. It draws power from the USB bus and ships with a 3-foot USB-A to USB-B cable, eight DIP-switch jumpers and a driver CD. Each DB9 male connector is independently configurable via DIP switches, and the adapter automatically reassigns COM-port numbers to simplify setup.

For multi-port industrial automation

Engineers integrating multiple sensors, PLCs or legacy serial equipment into modern PC, Mac or Linux systems will value the four-port density and automatic RS-422/485 detection. Installations that need only one serial link, or that rely on a different signalling standard, should select a single-port or protocol-specific adapter instead.

Four DB9 ports with auto protocol switching

The unit provides four DB9 male ports that each auto-detect and switch between RS-422 and RS-485 modes, removing the need for manual protocol selection per device. This single capability determines whether the converter matches the installed serial bus.

How it compares

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

Price $100.99
Pricier than about 91% of the 1,430 comparable items (median $14.99).

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Specifications

Product
Brand nameTripp Lite
Model nameU208-004-IND
Product typeUSB-B to DB9 F/M
Product colorBlack
Ports & slots
First connector1 x USB-B Female
Second connector4 x DB9 Male
Size & build
Shipping weight0.52 kg
Package size234 × 157 × 58 mm

Questions about this item

How many RS-422 or RS-485 serial devices can the four DB9 ports support simultaneously?

The adapter provides four DB9 male ports that auto-detect and switch between RS-422 and RS-485 for each connected device.

Does the USB-powered design add noticeable heat or fan noise during continuous operation?

The unit is bus-powered with no fan, so it runs silently and produces only minimal warmth during all-day use.

Which operating systems and host cables are required before the converter will function?

Drivers support PC, Mac and Linux; a 3 ft USB-A to USB-B cable is included in the package.

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