USB to 8-Port RS-232 RJ45 Serial Interface Adapter, Bus-Powered

Part: 2804   Model: SeaLINK+8/232.RJ

RJ45 Power Options


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The SeaLINK® 2804 8-port USB to serial adapter offers an easy way to connect multiple serial devices via a single USB port. The 2804 uses a state-machine architecture that greatly reduces the host computer’s overhead when communicating over multiple ports simultaneously. RS-232 data rates up to 921.6K bps are supported. The 2804 is housed in a rugged, attractive plastic enclosure with a high-retention USB type B connector that prevents accidental disconnection of the included USB cable.

Sealevel’s SeaCOM USB software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. After installing the software, the serial ports appear as standard COM ports to the host system enabling compatibility with legacy software.

The 2804 is USB bus-powered, so no external power supply is required. For conveniently powering serial peripherals, ordering options allow an external power source to be connected to a DC jack on the rear of the unit. The supplied power is fused and connected to pin 5 on each of the eight RJ45 connectors. Select the appropriate configuration option for your application. Optional power supplies are available under the Accessories tab.

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Additional information

Operating Temperature

0°C to 70°C (32°F to 158°F)

Communications Chip



9.2 (L) x 5.3 (W) x 1.7 (H)

Electrical Interface


High Retention USB


Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Host Interface(s)


Max Data Distance

50 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°C to 105°C (-58°F to 221°F)

USB Powered


# of Ports


  • Compliant with RoHS and WEEE directives
  • Utilizes high-speed UARTs with 128-byte Tx FIFOs and 384-byte Rx FIFOs
  • Housed in rugged, attractive plastic enclosure
  • Powered by USB connection
  • Optionally configured to power 5, 12 or 24 VDC serial peripherals
  • Optional external power is internally fused and connected to pin 5 on each RJ45 connector
  • Provides 8 RJ45 serial ports with Tx/Rx status LEDs
  • High-retention USB type B connector prevents accidental disconnection of USB cable
  • Integrates transmit and receive LED indicators on each port
  • Sealevel software supports Windows and Linux operating systems
  • Includes 72-inch USB cable (Item# CA179)

Windows Software

Software: SeaCOM - Windows

Linux Software

Software: SeaCOM - Linux


Datasheet: 2804


Manual: 2804


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