USB to 8 16-bit A/D, 8 Isolated Inputs, 8 Form C Relay Outputs Multifunction Module

Part: 570U   Model: SeaI/O-570U

(1 customer review)


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Control and monitor analog and digital interfaces via any USB connection. The SeaI/O-570U, designed using the Linear Technology LTC1867 A/D chip, provides eight single-ended 16-bit analog inputs, eight optically isolated inputs, and eight Form C relay outputs.

The A/D inputs are independently software-selectable for +/- 5V or +/- 15V ranges and feature high input impedance, allowing easy connection to a variety of sensors. The A/D inputs support floating/non-referenced or ground-referenced selections. This makes the A/D inputs ideal for measuring floating signal sources such as outputs of transformers, thermistors, and battery-powered devices. Additionally, the A/D inputs can operate in bipolar or unipolar modes, and a dipswitch enables a bias voltage of +5 through a 10K resistor for thermistor input mode.

The SeaI/O-570U module features eight optically isolated inputs rated for 5-30VDC and provides 3500 VDC external isolation, while the Form C relays are configurable as normally-open or normally-closed and can switch DC loads up to 24W. Perfect for a variety of data acquisition/control and test & measurement applications, the SeaI/O-570U includes removable terminal blocks, which simplify field-wiring connections.

The SeaI/O-570U is powered from your 9-30VDC source, or select from a variety of Sealevel power supply options. The modules operate over a wide operating temperature range of -20°C to 70°C and extended temperature range is optional.

Communicate with the SeaI/O-570U using the Sealevel SeaMAX API software libraries or use any Modbus RTU compliant device. Sealevel’s SeaMAX software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems.

Expand your I/O network with SeaI/O N-series products. SeaI/O modules are available with Reed and Form C relays, optically isolated inputs, TTL interfaces, A/D and D/A functionality. Up to 246 additional expansion modules can be added using convenient pass-through connectors.

The SeaI/O-570U integrates Sealevel’s SeaLATCH locking USB port, which is fully compatible with standard USB cables. When used with the included USB cable with a SeaLATCH USB type B connector, the metal thumbscrew provides a secure connection to the device and prevents accidental cable disconnection.

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.

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Additional information

A/D Chip

Linear Technology LTC1867

Input Isolation

2500 VAC RMS, 3500 VDC

Switching Capacity


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

RoHS Compliant


Power Requirement

9-30 VDC @ 2.6W

Power Connector

1.3mm Barrel, Terminal Block, RJ45 Pass-Through

# of Ports


Output Type

Form C Relay

Output Specification

24 VDC @ 1A

Operating Temperature

-20°C to 70°C (-4°F to 158°F)

Number of Inputs/Outputs

16 Inputs / 8 Outputs

Host Interface(s)


Input Impedance

6.2 K Ohms (in series)

Input Range

5-30 VDC

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

A/D Inputs

8 Single-Ended

Field Wiring

16 – 30 AWG

Extended Temperature

Call for Options


7.5 (L) x 5.1 (W) x 1.3 (H)

Digital I/O

Form C Relay Outputs, Isolated Inputs

Contact Voltage

30VDC max.

Contact Release Time

5ms max.

Contact Operate Time

5ms max.

Contact Current

2A max.

Contact Bounce Time

7ms max.



Analog I/O

A/D Inputs

A/D Resolution


A/D Range

+/-5V, +/-15V

USB Specification

1.1 Compliant, 2.0 Compatible

  • 8 single-ended 16-bit inputs
  • 8 optically isolated inputs
  • 8 Form C relay outputs
  • Removable screw terminals simplify field wiring
  • Input power via terminal block or modular connector
  • Sealevel’s SeaLATCH locking USB port provides secure connection with SeaLATCH USB cables via metal thumbscrews
  • DIN rail or table mount
  • Sealevel SeaMAX software supports Microsoft Windows and Linux operating systems
  • Includes 6′ USB type A to SeaLATCH USB type B device cable (Item# CA356)

Windows Software

Software: SeaMAX - Windows

Linux Software

Software: SeaMAX - Linux


Datasheet: 570U

1 review for SeaI/O-570U

  1. Ronald

    The SeaLevel 570U provides everything…
    The SeaLevel 570U provides everything what we need. Since modern machines aren’t fitted with an Serial Port and we needed to get a new product that would have the same functionality as our old product we looked around. Several people recommended to check out SeaLevel after assessing the product line we ordered one and have been using it in our product line. The API was easy to implement and questions about the API were answered quickly and with a good explanation. Only thing to make sure is that you get the SeaMAX v3.3.1.4 and that this device doesn’t come with a standard power supply.

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