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Supported Operating System

  • QNX 6.3
  • QNX 6.4

Supported MEN Boards

  • M77
  • M45N
  • M69N


  • Four (M77/M69N) or eight (M45N) serial devices (COM ports)
  • Physical interfaces:
    • RS232
    • M77: RS423 (for board revision R01)
    • M77: RS422/RS485 (full duplex, half duplex, half duplex echo enabled)
  • 4kB driver-internal receive buffer for each serial device
  • Baud rates up to 1,152,000 baud (depending on the physical interface)
  • Software handshake (XON/XOFF)
  • M45N/M69N: Hardware handshake (RTS,CTS,DTR,DSR)
  • 128 bytes receive/transmit FIFO for each serial device
  • 5..8 data bits, 1/1.5/2 stop bits, none/odd/even/mark/space parity
  • M77: Automatic direction control of line drivers in half-duplex mode (echo suppression)

Included Documentation

PDF user manual available as separate download


  • Even though the serial driver is a QNX native device driver, it requires the MDIS kernel server for the M-Module carrier (e.g. D203). Therefore, the 'MDIS4/2004 system package for QNX' is also required.
  • This driver needs revision 1.3 or higher of the MDIS4 system package. You can find the revision number of the current MDIS4 package in the history file of the package.

Licensing Information

MEN general licensing conditions

This article is free of charge.

Ordering Information & Downloads

Main Software

QNX native driver (MEN) for M77, M45N and M69N

Requires a compatible MDIS system package.