Home SEALEVEL | USB Serial Adapters SeaI/O-681U-OEM: USB to 8-Port RS-232 Serial Adapter
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SEALEVEL | USB Serial Adapters

SeaI/O-681U-OEM: USB to 8-Port RS-232 Serial Adapter

Now includes NABL Calibration Certificate.
Rs. 61722.00

The SeaI/O-681U-OEM is an 8-port board-level USB to RS-232 serial adapter designed for seamless integration into OEM platforms such as ITX, EBX, EPIC, and ATX. It offers high-speed serial communication and robust performance for embedded industrial systems..

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  • Detail
  • Special Features
  • Specification

The SeaI/O-681U-OEM provides reliable, high-performance USB to serial connectivity for industrial OEMs. Designed to fit directly into embedded system builds, this 8-port RS-232 board eliminates the need for external adapters while offering all the functionality of a full-size USB serial hub.
Its architecture offloads processing from the host, supporting smooth multi-port communication with minimal latency. All eight RJ45 ports include status LEDs for transmit/receive indicators, and power for connected peripherals is fused and routed via pin 5.
The RS-485 expansion connector allows for scalable I/O using Sealevel’s N-series OEM modules—ideal for expanding capabilities without redesigning the host system. The unit is RoHS compliant and includes a high-retention USB port for industrial-grade durability.

  • OEM board format for embedded and custom computing solutions

  • Eight RJ45 RS-232 serial ports with status LEDs

  • Supports high-speed data transfer up to 921.6K bps

  • State-machine design minimizes host CPU load

  • USB 1.1 compliant and USB 2.0 compatible

  • Powered from 9–30VDC with fused output to power serial peripherals

  • RS-485 passthrough port for expanding with SeaI/O N-series I/O modules

  • High-retention USB Type B connector for secure cable connection

  • Ideal for industrial PC integrations, kiosks, control systems

  • Fully compatible with legacy COM port applications

Parameter Value
Model SeaI/O-681U-OEM
Host Interface USB
Number of Ports 8
Serial Interface RS-232
Serial Connector(s) RJ45
Max Data Rate 921.6K bps
Max Data Distance 50 feet
Power Requirement 9–30VDC
USB Powered No (requires external power)
USB Specification USB 1.1 Compliant; USB 2.0 Compatible
Dimensions 7.5" (L) x 5.0" (W) x 0.8" (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)
Humidity Range 10–90% Relative Humidity, Non-Condensing
Communication Chip USB/UART
High Retention USB Yes
Expansion Port RS-485 passthrough for N-series OEM modules
Product Family SeaI/O
Board or Enclosure Board Only