DNx-SL-501 – 4-port, RS-232/485 serial communications board

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


The DNx-SL-501 are 4-port serial communications boards that offer fully isolated serial interfaces, software-configurable as RS-232 or RS-485. DNA/DNR-SL-501 supports up to 2 Mbit/s transfer speed in RS-485 mode or up to 256 Kb/s in RS-232 mode.



  • 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

Software for the DNA/DNR-CAN-501 series is provided in the UEI Software Suite. A high-level easy to use API is provided for Linux and most real-time operating systems, and the UEIDAQ Framework for Windows which provides a comprehensive, easy to use API.
In addition to standard serial I/O features, the DNx-SL-501 offers a series of additional functions. These functions include:
  • Fully customizable baud rates from 300baud to 2Mbaud
  • Programmable inter-character delay
  • Programmable inter-frame delay
  • Automatic repeat of the last frame if new data is not sent from the host on time
  • 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
  • Echo suppression in half-duplex mode (for 422 mode)
  • Timeout programmable in 10us, 100us or 1ms intervals

I/O Chassis
Model No.


RACKtangle ®


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