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Q136509: External Modem Cannot Receive Data

Article: Q136509
Product(s): Microsoft Windows 95.x Retail Product
Version(s): 95
Operating System(s): 
Keyword(s): win95
Last Modified: 17-DEC-2000

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The information in this article applies to:

- Microsoft Windows 95 
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SYMPTOMS
========

After you install Windows 95, it may appear that your external modem can no
longer receive data. You may be able to connect and send data, but the modem
does not receive any data.

CAUSE
=====

This problem can occur if the external modem is connected to your computer with
a serial cable, serial switch box, or other hardware device that is defective or
not configured correctly for hardware flow control (RTS/CTS).

RESOLUTION
==========

To resolve this problem, use either of the following methods:

- Replace the device used to connect the external modem to the computer if the
  device is defective, or configure it for hardware flow control.

- You may be able to work around the problem by configuring the modem for
  software flow control. To do so, follow these steps:

   - In Control Panel, double-click the Modems icon.

   - Click the modem you are using, and then click Properties.

   - On the Connection tab, click the Advanced button.

   - Make sure that the Use Flow Control check box is selected, and then click
     the Software (XON/XOFF) option button.

   - Click OK until you return to Control Panel.

  NOTE: This workaround affects only 32-bit communications programs. If you are
  using a 16-bit program, you must configure the modem to use software flow
  control in the program itself. For information on how to do so, please
  consult the program's documentation.

MORE INFORMATION
================

Windows and Windows for Workgroups version 3.x use software flow control by
default. Windows 95 uses hardware flow control by default, which typically
results in better modem performance. However, if your external modem is
connected to your computer with a defective or incorrectly configured serial
device, you may be unable to use hardware flow control.

======================================================================
Keywords          : win95 
Technology        : kbWin95search kbZNotKeyword3
Version           : 95

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