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Part# 2104


USB to 1-Port Isolated RS-422, RS-485, RS-530 DB25 Serial Interface Adapter


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The 2104 USB serial interface adapter provides one isolated RS-422 or RS-485 serial port for control and automation applications. Isolation helps to prevent damage caused by ground loops and surges. Power for the SeaLINK+485I is obtained directly from the USB cable, eliminating the need for wall power.

Sealevel's SeaCOM USB software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. After installing the software, simply connect the SeaLINK® serial interface adapter to your USB port and the device is immediately recognized by the system as a standard serial port.

Do you know that adapter design can impact your application? Find out how in this USB Serial performance report.
Host Interface(s) USB
# of Ports 1
Brand/Family SeaLINK
Electrical Interface RS-422, RS-485, RS-530
Optically Isolated Yes
USB Powered Yes
High Retention USB Yes
RoHS Compliant Yes
Serial Connector(s) DB25M
Communications Chip USB/UART
Max Data Rate 921.6K bps
Max Data Distance 4000 feet
Power Requirement +5V @ 100mA
USB Specification 1.1 Compliant
2.0 Compatible
Operating Temperature 0 - +70C
Storage Temperature 0 - +70C
Humidity Range 10 - 90% Relative Humidity, Non-Condensing
Dimensions 3.8" (L) x 2.3" (W) x 1.0" (H)
9.66 cm (L) x 5.84 cm (W) x 2.54 cm (H)
  • • Compliant with RoHS and WEEE directives
  • • Configurable for RS-422, RS-485, or RS-530
  • • Optical isolation provides protection against transients and group loops
  • • High speed UART with 128-byte Tx FIFO and 384-byte Rx FIFO
  • • Data rates to 921.6K bps
  • • Automatic RS-485 enable/disable
  • • Hot-swappable
  • • Powered by USB connection
  • • Sealevel software supports Windows 98SE/ME/2000/XP/Vista and Linux operating systems
  • • DB-25M connector
  • • Includes 6' USB device cable (Item# CA179)

Terminal Block Kit
Terminal Block Kit


DB25 Serial Cable
DB25 Serial Cable


DB25F to Opto 22 DB9F
DB25F to Opto 22 DB9F


Terminal Block
Terminal Block


Modular Adapter
Modular Adapter


Proudly Made in the USA
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