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

DNx-SL-501-804, DNA-SL-501-804, DNR-SL-501-804, DNF-SL-501-804


  • Arbitrary baud rate selection (0.01% accuracy)
  • Max speed of 256 Kb/s for RS-232 and 4 Mb/s for RS-485
  • J1587/J1708 support included
  • Each port is software-configurable as RS-232 or RS-485
  • Completely independent bit rate settings for every port
  • 350 V isolation between ports, ports and circuitry; 15 kV ESD
  • 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: $1284
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Typically in stock for 1-2 week delivery.

DNx-SL-501-804, DNA-SL-501-804, DNR-SL-501-804, DNF-SL-501-804

The DNx-SL-501-804 are 4-port serial communications layers for UEI's popular "Cube" and RACKtangle I/O chassis. The boards offer fully isolated serial interfaces, software-configurable as RS-232 or RS-485. DNx-SL-501-804 supports up to 4 Mbit/s transfer speed in RS-485 mode or up to 256 Kb/s in RS-232 mode. The DNx-SL-501-804 is a special, high speed version of the popular DNx-SL-501 board. The boards use a 16550C UART emulation on each port (FIFO mode only) and support half- and full-duplex mode over RS-485.

The DNx-SL-501-804 is compatible with RS-422 networks when used in RS-485 mode. The layer provides 200Ω software-selectable TX and/or RX termination for RS-485 communications. The DNx-SL-501-804 is an ideal solution for connecting serial based data acquisition devices to the Ethernet as well as interfacing to a wide variety of serial based devices and legacy DAQ systems. In addition to standard serial I/O features, the DNx-SL-501-804 offers a series of additional functions. These functions include:

  • Fully customizable baud rates generated by programmable PLL on per-channel basis from 300baud to 4Mbaud
  • Programmable inter-character delay (required to drive/simulate some avionics instruments)
  • Programmable inter-frame delay (used to schedule frames at different rate)
  • Automatic repeat of the last frame if new data is not sent from the host on time (required to keep "inop" flag happy on many avionic devices)
  • None/Even/Odd/Space/Mark parity in 8-bit mode and per- symbol programmable in 9-bit mode
  • Automatic in-hardware or software flow control
  • Asynchronous event mode with loop closure in 100us (for avionics expecting immediate reply)
  • Echo suppression in half-duplex mode (for 422 mode)
  • Timeout programmable in 10us, 100us or 1ms intervals



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