USB to 1-Port Isolated RS-232 DB25 Serial Interface Adapter

Part: 2103   Model: SeaLINK+232I

(1 customer review)


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The 2103 USB isolated serial I/O adapter provides a single USB to RS-232 serial port allowing USB connectivity to legacy and non-USB compliant devices. Now your non-USB peripherals can have the same connection simplicity and ease of use as USB peripherals. The serial interface adapter provides isolation to help prevent damage caused by ground loops and surges. Power for the SeaLINK+232I serial interface adapter is obtained directly from the USB cable, eliminating the need for external power supplies.

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 SeaLINK® serial interface adapter to your USB port and the device is immediately recognized by the system as a standard serial port.

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Additional information



Optically Isolated


USB Powered


Storage Temperature

0°C to 70°C (32°F to 158°F)

Serial Connector(s)


RoHS Compliant


Power Requirement

+5V @ 100mA

# of Ports


Operating Temperature

0°C to 70°C (32°F to 158°F)

Max Data Rate

460.8K bps

Communications Chip


Max Data Distance

50 feet

Host Interface(s)


Humidity Range

10 – 90% Relative Humidity, Non-Condensing

High Retention USB


Electrical Interface



3.8" (L) x 2.3" (W) x 1.0" (H)9.66 cm (L) x 5.84 cm (W) x 2.54 cm (H)

USB Specification

1.1 Compliant2.0 Compatible

  • Compliant with RoHS and WEEE directives
  • High-speed UART with 128-byte Tx FIFO and 384-byte Rx FIFO
  • Optical isolation provides protection against transients and ground loops
  • Data rates to 460.8K bps
  • Hot-swappable
  • Powered by USB connection
  • Sealevel software supports Windows 98SE/ME/2000/XP/Vista and Linux operating systems
  • DB-25M connector
  • Includes 6′ USB device cable (Item# CA179)

Windows Software

Software: SeaCOM - Windows

Linux Software

Software: SeaCOM - Linux


Datasheet: 2103


Manual: 2103

1 review for SeaLINK+232I

  1. Stuart

    Robust & Long Life
    Our two 2103 adapters have been in continuous use on our equipment repair endurance test bench since 2006, they run 24 hours a day 7 days a week testing customers equipment or several different types and have proved well able to withstand abuse from the defective controllers that are regularly connected to them, we are currently our 4th PC that we use to run our test programs but the 2103s keep running. Well worth the money we originally spent.

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