RS-485 Modbus RTU Interface to 16 Isolated Inputs / 16 Open-Collector Outputs

Part: 530M   Model: SeaI/O-530M


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The SeaI/O-530M is an RS-485 Modbus RTU interface to 16 optically isolated inputs and 16 open-collector outputs. Inputs can range from 5-30VDC, while the open-collector outputs provide high current sinking over a large operating voltage. Each open-collector output circuit includes a flyback diode for protection when interfacing highly inductive loads, such as DC motors. Inputs are grouped into four-bit segments. Each group shares a common for easy wiring via removable 3.5mm terminal blocks. Outputs are grouped in eight-bit ports which share high and low voltage inputs.

The SeaI/O-530M is powered from your 9-30VDC source, or select from a variety of Sealevel power supply options.

Communicate with the SeaI/O-530M 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.

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



Operating Temperature

-25°C to 85°C (-13°F to 185°F)

RoHS Compliant


Power Requirement

9-30 VDC @ 1.4W

# of Ports


Output Voltage

Max. 60VDC

Output Type


Output Power

DC 60W max.

Output Isolation

2500VAC RMS, 3500VDC

Output Dissipation

Max. 1000mA (single), Max. 2000mA (port)

Number of Inputs/Outputs

16 Inputs / 16 Outputs

Digital I/O

Isolated Inputs, Open-Collector Outputs

Host Interface(s)


Input Impedance

6.2K Ohms (in series)

Input Range

5-30 VDC

Input Isolation

2500VAC RMS, 3500VDC

Humidity Range

10 – 90% Relative Humidity, Non-Condensing

Extended Temperature

Call for Options


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

Storage Temperature

-50°C to 105°C (-58°F to 221°F)

  • RS-485 Modbus RTU interface
  • 16 optically isolated inputs
  • 16 open collector outputs
  • Removable screw terminals simplify field wiring
  • Input power via terminal block or modular connector
  • Optional DIN rail or table mount
  • Sealevel SeaMAX software supports Microsoft Windows and Linux operating systems

Windows Software

Software: SeaMAX - Windows

Linux Software

Software: SeaMAX - Linux


Datasheet: 530M


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