Part#: 2402

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USB to 4-Port RS-422, RS-485 DB9 Serial Interface Adapter

Interface Accessories



The SeaLINK® 2402 USB serial I/O adapter provides four RS-422 or RS-485 serial ports for USB connectivity to legacy or non-USB compliant devices.

Sealevel’s SeaCOM USB software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. After installing the software, simply connect the 2402 serial interface adapter to your USB port. The device is immediately recognized by the system. Now your non-USB peripherals can have the same connection simplicity and ease of use as USB aware peripherals.

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Additional information

Operating Temperature

0 – +70C

Communications Chip



7.1 (L) x 5.3 (W) x 1.5 (H)

Electrical Interface

RS-422, RS-485

High Retention USB


Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)


Max Data Distance

4000 feet

Max Data Rate

921.6K bps

USB Specification

1.1 Compliant2.0 Compatible



Power Requirement

+5V @ 500mA

RoHS Compliant


Serial Connector(s)


Storage Temperature

-50 – +105C

USB Powered


# of Ports


  • • Compliant with RoHS and WEEE directives
  • • Each port individually configurable for RS-422 or RS-485
  • • High speed UART with 128-byte Tx FIFO and 384-byte Rx FIFO
  • • Data rates to 921.6K bps
  • • Automatic RS-485 enable/disable
  • • Serial and USB activity LEDs
  • • Hot-swappable
  • • Powered by USB connection
  • • Sealevel SeaCOM software supports Windows and Linux operating systems
  • • DB-9M connectors
  • • Includes 6′ USB device cable (Item# CA179)

Windows Software

Software: SeaCOM - Windows

Linux Software

Software: SeaCOM - Linux


Manual: 2402


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