Precision You Can Trust
NABL-Accredited Calibration | Available on Request
The SeaI/O-420U provides 16 optically isolated inputs and 8 SPDT Form C relays for industrial control and monitoring applications. It communicates via USB using Modbus RTU and includes Sealevel SeaLATCH USB port for secure connections..
The SeaI/O-420U is a USB-based I/O module offering 16 optically isolated inputs and 8 SPDT Form C relays. The optically isolated inputs are perfect for applications where isolation from high voltages or electrical noise is needed, with an input range of 5-30VDC. The Form C relays provide long-life switching capabilities and can handle DC loads up to 60VDC @ 2A, ideal for controlling a wide variety of devices.
The module communicates over USB using Modbus RTU, ensuring easy integration with computers and control systems. It is powered via 9-30VDC, and removable screw terminals make installation and wiring a breeze. The Sealevel SeaLATCH USB port ensures a secure, metal-to-metal connection with USB cables, preventing accidental disconnections.
For system expansion, the SeaI/O-420U supports up to 246 additional SeaI/O N-series modules, allowing for large-scale industrial applications. The module is housed in a durable enclosure, suitable for industrial environments, and can be mounted on DIN rails or used on a tabletop.
16 Optically Isolated Inputs – Rated for 5-30VDC, perfect for monitoring sensors, switches, and other devices in industrial systems
8 SPDT Form C Relays – Switch up to 60VDC @ 2A, ideal for controlling low-current devices in industrial environments
Sealevel SeaMAX API – Supports integration with Windows and Linux systems
Sealevel SeaLATCH USB Port – Provides secure connection with metal thumbscrews to prevent accidental disconnections
Removable Screw Terminals – Simplifies field wiring and installation
DIN Rail or Table Mountable – Flexible installation options for various environments
USB Communication – Supports Modbus RTU over USB for easy connectivity to computers and control systems
Included USB Cable – Comes with a 6' USB Type A to SeaLATCH USB Type B cable (Item# CA356)
Power Input – Operates on 9-30VDC, with optional Sealevel power supply options
Expansion Capability – Supports up to 246 additional SeaI/O N-series modules
| Parameter | Details |
|---|---|
| Model Number | 420U |
| Form Factor | Enclosure |
| Host Interface | USB |
| Communication Protocol | Modbus RTU |
| Number of Inputs | 16 |
| Input Type | Optically Isolated Inputs |
| Number of Outputs | 8 |
| Output Type | Form C Relays (60VDC @ 2A) |
| Power Requirement | 9–30 VDC @ 2.2W |
| Expansion Capability | Supports up to 246 SeaI/O N-Series Modules |
| Software Compatibility | SeaMAX API (Windows/Linux), Modbus RTU |
| iOS App Support | N/A |
| Operating Temperature | 0°C to 70°C (32°F to 158°F) |
| Storage Temperature | -50°C to 105°C (-58°F to 221°F) |
| Humidity Range | 10–90% RH, Non-Condensing |
| Dimensions (inches) | 7.5" (L) x 5.0" (W) x 0.8" (H) |