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HDLC104 - HDLC Communications Controller

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The HDLC104 is a four channel HDLC communications controller on a single PC/104 card. The HDLC104 uses a high performance, industry standard serial communication controller to provide 4 independent channels that can be configured for either HDLC-Synchronous or Asynchronous communication.

The HDLC104 has been designed for demanding transportation and industrial applications. The HDLC104 supports an extended temperature operation range of -40°C to +85°C. All 4 ports feature galvanic isolation up to 2000Vrms.

Each of the 4 channels can be individually configured for RS-232, RS-422 or RS-485 electrical interface. Each channel has independent receive and transmit FIFOs that allow high speed serial data rates. Intelligent interrupt hardware and flexible address decoding allow the HDLC104 card to occupy only 32bytes of IO space and a single IRQ line on a PC/104 system.

The HDLC104 is available with software drivers for Linux, Windows-XP and Windows-CE6.0/7.0 (x86).



  • 4 channel concurrent operation
  • Individually configurable for HDLC / Asynchronous operation
  • 2000Vrms galvanic isolation for each port
  • Selectable RS-232/422/485 electrical interface
  • Uses single IRQ
  • Rugged, Locking I/O connectors
  • Single +5V power supply
  • Extended temperature operation (-40°C to +85°C)
  • Standard PC/104 form factor


  • Serial protocol conversion
  • Mass-Transit / Transportation
  • Vending Machines
  • POS and ATM systems
  • Remote instrumentation
  • LAN Gateway or Bridge
  • Embedded WAN
  • Locomotive Communications

Block Diagram

Block Diagram

Communications Controller

  • 32Bytes FIFO per channel
  • HDLC synchronous, Asynchronous operation


  • HDLC protocol support
  • Wide range of serial encoding methods:
    NRZ, NRZB, Biphase Mark (FM1), Biphase Space (FM0),
    Biphase Level (Manchester),
    Biphase Differential (Manchester Differential)
  • Up to 1MBit/sec multiple Ports (depends on host CPU)
  • Supporting differential TX-Data and RX-Data
  • Full-duplex operation
  • Abort Sequence generation and checking
  • Automatic zero bit insertion/deletion
  • Automatic flag insert


  • Programmable baud rates up to 115200bps
  • Full-duplex operation
  • 5,6,7, or 8 data bits per character
  • 1, 1.5, or 2 stop bits
  • Odd or Even parity

Bus Interface

  • 16-bit PC/104 Interface (stack through)
  • Single IRQ - one of IRQ 10 or 11
  • Flexible I/O mapping to PC/104 IO space

Physical Interface

  • Independent RS-232/RS-422/RS-485 ports
  • 2000Vrms galvanic isolation
  • Supporting TX-Data, RX-Data, CTS, RTS
  • 4 off 10-pin 0.1inch pitch headers


  • Single +5V at less than 1000mA
  • Operating temp -40°C to +85°C (extended temp)
  • Standard 3.6 x 3.8in PC/104 form factor

Software Support

  • Linux
  • Windows-XP
  • Windows-CE 6.0, 7.0 (for x86)

The following order codes can be used when ordering the HDLC104

HDLC104-Ext - 4-port PC/104 HDLC Controller (-40 to 85°C

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