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SEALEVEL | USB Serial (Software Selectable) Adapters

SeaLINK+4.SC

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The SeaLINK+4.SC (Model 2423) is a robust 4-port USB-to-serial adapter with software-configurable RS-232, RS-422, or RS-485 support. Designed for quick deployment and flexibility, it maintains port settings across systems and supports high-speed data communication up to 921.6K bps..

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The SeaLINK+4.SC (Model 2423) simplifies serial expansion by connecting up to four serial devices over one USB port. Each port can be configured in software as RS-232, RS-422, or RS-485 without physical changes. Whether you are upgrading a host system or deploying the unit across multiple PCs, settings are retained locally to ensure uninterrupted operation.

The unit is powered entirely through the USB interface and incorporates a highly-retentive USB Type B connector for reliable, locked-in connections. Its intelligent state-machine architecture minimizes CPU load during multi-port communication, making it ideal for industrial control systems, legacy serial device connectivity, and data acquisition setups.

With full support from Sealevel’s SeaCOM drivers, the SeaLINK+4.SC integrates effortlessly with Windows environments and legacy COM-port-dependent software.

  1. Four individually software-configurable RS-232/422/485 ports

  2. No jumpers or switches – full driver-based interface selection

  3. Interface settings persist across multiple systems

  4. Compatible with legacy COM port applications

  5. High-speed UART performance (921.6K bps supported)

  6. USB bus-powered – no external power needed

  7. LED indicators for power, activity, and port interface type

  8. Highly retentive USB Type B port resists accidental disconnection

  9. Rugged and compact enclosure suitable for industrial environments

  10. Optional extended temperature model available (-40°C to 85°C)

Parameter Value
Model SeaLINK+4.SC (2423)
Host Interface USB
Number of Ports 4
Serial Interface RS-232, RS-422, RS-485
Connector Type DB9M
Configuration Method Software-Controlled
Max Data Rate 921.6K bps
Max Data Distance 50 ft (RS-232), 4000 ft (RS-485)
Power Requirement USB Bus-Powered
USB Connector Type B (High Retention)
USB Specification USB 1.1 Compliant; USB 2.0 Compatible
Dimensions 9.2" (L) x 5.3" (W) x 1.7" (H)
Operating Temperature 0°C to 70°C (32°F to 158°F)
Storage Temperature -50°C to 105°C (-58°F to 221°F)
Communication Chip USB/UART
High Retention USB Yes
Enclosure Rugged Plastic
Humidity Range 10–90% Relative Humidity, Non-Condensing
Product Family SeaLINK