Applies To:
  • CitectSCADA 1.00 1.01 1.10 1.11 1.20 2.00 2.01

The following is a Microsoft Application Note extracted from TechNet:

Microsoft has an Application Note, "WG1001: Updated SERIAL.386 Driver for Windows for Workgroups.

When you use Windows for Workgroups version 3.11 with serial communications software, you may experience the following problems:

  1. If you are using a Pentium-based machine with a 16550 UART chip, your system stops responding (hangs) if there is data in the chip when the serial communications application attempts to open the
    communications port.
  2. When you are using communications software, you may be able to make one connection after starting Windows for Workgroups, but any subsequent connections fail and may hang your system.

The WG1001 disk included with this Application Note contains an  updated SERIAL.386 driver that corrects both of these problems.


You can obtain this Application Note from the following sources:
  • CompuServe, GEnie, and Microsoft OnLine
  • Microsoft Download Service (MSDL)
  • The Internet (Microsoft anonymous ftp server)
  • Microsoft FastTips Technical Library
  • Microsoft Product Support Services

You can also obtain this file from the Citect BBS if you have a valid maintenance contract.