Release Notes P/N 93000160_G

                              Digi RealPort Service
                                Version 2.4.34.0

                             Microsoft Windows NT 4.0

                          Software Package P/N 40001738_G

                                   11/12/2001


CONTENTS

1. INTRODUCTION
2. SUPPORTED PRODUCTS
3. BUG FIXES
4. KNOWN LIMITATIONS
5. ETHERLITE UPGRADE
6. PRINTERS
7. UNINSTALL
8. HISTORY


1. INTRODUCTION

   The RealPort Service provides Windows NT seamless access to serial ports
   on Digi PortServer or PortServer II products.

   The Digi PortServer Product family allows Windows NT users to attach
   serial devices (modems, terminals, and printers) to the Ethernet based
   terminal server.  Users can use Windows NT RAS, Citrix, dial-out modem
   pooling applications and terminal server applications such as Point-of-Sale
   (POS) with the flexibility of terminal server connected devices.

   The RealPort Service requires the TCP/IP driver to be installed and
   properly configured.


2. SUPPORTED PRODUCTS

   PortServer
   PortServer II
   PortServer TS
   Digi One RealPort
   EtherLite 2/80/160/162


3. BUG FIXES

   See HISTORY for details.


4. KNOWN LIMITATIONS

   PortServer generates receive data errors when running 16 ports full duplex
   at 57600 BAUD.  Changing the baudrate of a serial printer requires deleting
   the printer device and then re-adding the device with a different baudrate.
   This is a print manager limitation in Windows NT 4.0.

   Software flow control characters set to the null (0x00) character for the
   Xon and Xoff character will be ignored by the driver.

   The IOCTL_SERIAL_XOFF_COUNTER is not supported.


5. ETHERLITE UPGRADE

   This release of the RealPort Service does support the EtherLite 2/80/160/162.
   Note that you have to take some extra steps to use the RealPort software with
   your EtherLite, if you have previously used the EtherLite driver.

   A. Uninstall the old EtherLite driver, reboot your system.
   B. Update the EtherLite firmware using the DGIPSERV utility which is
      part of this driver package. You can download the latest firmware files
      from the Digi Support Web site at http://support.digi.com.
   C. Install the new RealPort Service.


6. PRINTERS

   If you are planning to use the RealPort Service with Serial Printers,
   you have to reboot the system after the device installation or after
   renaming ports. This is a known limitation of the Print Spooler which
   does not detect changes in the list of available ports automatically.


7. UNINSTALL

   1. Run Control Panel | Network
   2. Select Services
   3. Select the Digi RealPort Service from the Network Services list
   4. Choose Remove


8. HISTORY

   Version 2.4.34.0 - November 12, 2001
      NEW FEATURES
        The DGIPSERV utility for the supported EtherLite products allows easy
        configuration of device parameters and to upgrade the EtherLite's firmware.

        From this release on, the version numbers for all files have been changed
        to match the RealPort Service version number.

      BUG FIXES
        Fixed several printing related issues:
          - Serial Printing did not work in some cases.
          - Ports were not displayed in Print Properties.

   Version 1.0.20 - August 15, 2001
      NEW FEATURES
        The RealPort Service now supports the PortServer TS, Digi One RealPort,
        and EtherLite 2/80/160/162 devices.

        If you assign a DNS name to your PortServer TS you can use that name to
        install/configure your PortServer.  (See Local Network Administrator for
        getting a DNS name assigned.)


   Version 1.0.8 - Oct 10, 2000
      BUG FIXES
        The RealPort Service will attempt to reestablish its connection to a
        PortServer when a loss of its TCP/IP connection is detected.  This action
        will occur for any currently open serial ports without user or application
        interaction.  Previously when the TCP/IP connection was lost, any open
        serial ports would remain in an error state until they were closed and
        reopened.  This fix makes those steps unnecessary.

   Version 1.0.7 - May 4, 2000
      BUG FIXES
         A close/open race condition has been resolved.  The symptoms of this
         error were exhibited by invalid data returned when using the DOS
         command MODE, or a printer problem after a system reboot.

         A transmit latency condition has been resolved.  The symptom of this
         error involves single character data incurring latencies of 120ms.
         This symptom was only encountered when an application buffered
         character input, but only issued a single character to the driver.
         The driver was designed with the assumption that the application would
         send a buffer of data when available and not parcel the data a
         character at a time.

         A fix for serial printers has been added.

   Version 1.0.3 - August 25, 1998
      BUG FIXES

   Version 1.0.2 - November 7, 1997
      BUG FIXES

   Version 1.0.1 - July 21, 1997
      Initial product release.