USB to 8 Optically Isolated Inputs / 8 Form C Relay Outputs Digital Interface Adapter

Part: 8206FX   Model: SeaLINK PLC-16

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This product is classified as legacy and will be supported with limited, available inventory. Call for current pricing and product availability.

Sealevel will support legacy products through technical and warranty support, software drivers and product manuals. Please contact Sales for further information. For new product designs, we recommend the SeaI/O-420U.

The SeaLINK® 8206FX digital I/O interface adapter provides 8 optically isolated inputs and 8 Form C relay outputs, which can be utilized for PC based control and industrial automation.

The 8 Form C relays support 2 Amp switch and carry current. Our unique serial string naming feature allows multiple USB digital I/O devices to retain their specific identity within the system. Onboard removable screw terminals are provided to simplify wiring connections. A DIN rail mounting option is available.

Sealevel’s SeaIO Classic software drivers and utilities make installation and operation easy using Windows operating systems.

To simplify installation and configuration, a printed copy of the USB Digital I/O QuickStart Guide is included with all USB Digital I/O orders.

Important: This product is not supported on systems with USB 3.x ports, regardless of the speed of the USB port it is connected to. If you are a previous customer of non-FX SeaLINK digital I/O adapters, you must update your SeaIO driver for proper operation of this 8206FX module. Please read this Support Article for details.

Get a jump start on your digital I/O development with The Digital I/O Handbook that will provide helpful information that you will use again and again. Check out Chapter 1 for an overview of logic principles.


Additional information

Board Connector

5.08mm Screw Terminals

Input Range

5-30 VDC

Storage Temperature

-50°C to 105°C (-58°F to 221°F)

Power Requirement

+5V @ 500mA

# of Ports


Operating Temperature

0°C to 70°C (32°F to 158°F)

Number of Inputs/Outputs

8 Inputs8 Outputs

Host Interface(s)


Humidity Range

10 – 90% Relative Humidity, Non-Condensing



Field Wiring

12 – 30 AWG

Extended Temperature

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

Digital I/O

Form C Relay Outputs, Isolated Inputs

Contact Voltage

60VDC max.

Contact Current

2A max.

USB Specification

1.1 Compliant, 2.0 Compatible

  • Eight Form C relay outputs (SPDT)
  • Eight optically isolated inputs
  • One 16-pin and two 12-pin removable screw terminals simplify field wiring
  • Powered by USB connection
  • Includes 72″ USB cable (Item# CA179)
  • Sealevel SeaIO Classic software supports Windows operating systems


Manual: 8206


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