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4-port, RS-232/422/485 serial communications board

DNx-SL-501, DNA-SL-501, DNR-SL-501, DNF-SL-501


  • 4 independent ports
  • Each port is software-configurable as RS-232 or RS-485
  • Compatible with Half- and full-duplex support
  • Max speed of 256Kbit/s for RS-232 and 2 Mbit/s for RS-485
  • Completely independent bit rate settings for every port
  • 350V isolation between ports, ports and circuitry
  • Compatible with RS-422 networks when used in RS-485 mode
  • Half- and Full-duplex support for RS-485
  • Includes UEI-RSS Remote Serial Server application, Windows and Linux versions
4-port, RS-232/422/485 serial communications board
Product Style: What do the "DNx" prefixes mean? "DNA" prefix is for a Cube & MIL Cube Board, "DNR" prefix is for a Rack & MIL Rack Board , and "DNF" prefix is for a FLATRACK board.
Software/Programming: How UEI solutions are used. Hosted - Connected to a PC with Windows, Linux, QNX, VxWorks, RTX, or similar OS. Hosted also is for OPC-UA, Modbus and EtherCAT. Standalone - Controller with Linux or VxWorks OS, Simulink I/O Target or UEILogger. Available options for this product are shown in the drop down menu.
Quantity: $750
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Typically in stock for shipment in 3-4 weeks. Subject to global supply chain challenges.

DNx-SL-501, DNA-SL-501, DNR-SL-501, DNF-SL-501

The DNx-SL-501 is a 4-port serial communications board (layer) for PowerDNA distributed automation and control system. This board (layer) offers isolated serial interfaces software-configurable as RS-232 or RS-485. DNx-SL-501 supports up to 2 Mbit/s transfer speed in RS-485 mode or up to 256Kbit/s in RS-232 mode. DNx-SL-501 uses 16550 UART controller on each port (FIFO mode only) and supports half- and full-duplex mode for RS-485.

The DNx-SL-501 includes the UEI-RSS Remote Serial Server application, Windows and Linux versions. This server allows a Windows or Linux host PC to configure the DNx-SL-501 ports as standard serial ports within the host OS (e.g. as COM1: to COM255: ports in Window or standard POSIX functions in Linux). The UEI-RSS supports up to 255 unique serial ports per Ethernet port on the host.



  • PowerDNA
  • UEILogger