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DNA-SL-501-804
DNA-SL-501-804
RS-232/485 Serial Communications Interface
 
The DNA-SL-501-804 and DNR-SL-501-804 are 4-port serial communications layers for popular “Cube” and RACKtangle I/O chassis respectively. The boards offer fully isolated serial interfaces, software-configurable as RS-232 or RS-485. DNA/DNR-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 DNA/DNR-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 DNA/ DNR-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
 
Characteristics:
  • For use in DNA Series "Cube"
  • 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
 
Technical Specifications
General Serial Specifications
Number ports 4
Serial Interfaces RS-232, RS-485(RS-422),
per-port software-configurable
Max. speed RS-232 256 Kb/s
RS-485 4 Mb/s 
Baud rate selection Any rate from 300 baud to 2 Mbaud, with 0.01% 
accuracy
Supported Modes half- and -full-duplex
RS-232/485 Transceiver MAX3160E (w/ fail-safe RS-485 RX termination)
UART Controller 16550C emulation (w/ extended parity control)
Protection 350 V channel-to-channel; 15 kV ESD protection
Power Consumption 2-5 W (RS-485 mode with max current drive)
Operating Temperature Tested -40 to +85 °C
Operating Humidity 0 - 95%, non-condensing
UART Controller
Base Clock 66 MHz, 24 MHz, custom
FIFO Size 2048 (input and output)
Error Detection interrupts-based, 4 per port
Dedicated Port Interrupts UART interrupt, Timeout interrupt, TX/RX FIFO interrupt
General
Isolation 350 Vrms port-to-port and port-to-chassis
Power consumption 2.0 W (not including output loads)
Operating Temp. (tested) -40°C to +85°C
Operating Humidity 0 - 95%, non-condensing
Vibration IEC 60068-2-6 5 g, 10-500 Hz, sinusoida
IEC 60068-2-64 5 g (rms), 10-500 Hz, broad-band random
Shock IEC 60068-2-27 50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations
MTBF 350,000 hours