USB to 4-Port RS-232 DB9 Serial Interface Adapter

Part: 2401   Model: SeaLINK+4/232

(4 customer reviews)


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The SeaLINK® 2401 USB serial I/O adapter provides four RS-232 serial ports for USB connectivity to legacy or non-USB compliant devices. Data rates up to 460.8K bps are supported.

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 2401 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°C to 70°C (32°F to 158°F)

USB Powered


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

Serial Connector(s)


RoHS Compliant


Power Requirement

+5V @ 50mA

# of Ports


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



7.1 (L) x 5.3 (W) x 1.5 (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
  • Data rates to 460.8K bps
  • All modem control signals implemented
  • 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


Datasheet: 2401


Manual: 2401

4 reviews for SeaLINK+4/232

  1. Brian

    Excellent reliability
    Several 2401 in production service for years. No failures. Transparent in system.

  2. MDEE

    Easy to Use, Top Quality
    The 2401-OEM is an excellent way to interrogate 4 RS-232 Ports from a single computer. We had a requirement to display 4 RS-232 streams in different Hyperterminal screens, and this product made it simple to achieve. The board is sturdy and works as described. We had no problems integrating it into our design other than mounting (we assumed standard and the holes are metric). I would recommend this to anyone who needs to add RS-232 capabilities to their design.

  3. Ham_Man

    Excellent Product
    I have used several of the Sealevel products and the installation is always smooth and the performance is outstanding. I just installed another 2401 today and it took about 5 minutes and, as I expected, There were no issues encountered.

  4. Doug

    Outstanding Product
    We just installed our second unit. The first one has been in service for several years and has worked great with LabVIEW.

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