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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

  • TypeUSB-B to DB9 F/M
  • ColorBlack
  • Connector A1 x USB-B Female
  • Connector B4 x DB9 Male
  • 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.

Highlights

  • 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

Specifications

BrandTripp Lite
ModelU208-004-IND
TypeUSB-B to DB9 F/M
ColorBlack
Connector A1 x USB-B Female
Connector B4 x DB9 Male
FeaturesAuto-detects and -switches RS-422 and RS-485 serial devices
Independent DIP switch controls provide easy port configuration
Automatically reassigns COM values to each port to avoid additional configuration
USB-powered, so no bulky or obtrusive external power supply is required
Compatible with Windows, Mac and Linux—works with most computers
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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