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7.6

Serial COM timeout within application when moved from NT to Server 2003

Asked by adorenbaum in Operating Systems Development, Signal Processing

Tags: Visual Basic 6.0, N/A, N/A

Have existing VB6 application that manages communications down a COM port on either an XP or NT based platform.  The physical channel uses only lines 2,3,5 for transmit, receive and ground.  The computer is connected via a null modem cable to the device.  When the application is moved to Windows Server 2003, it appears to fail due to what is believed to be missed received data by the application.

The app is composed of a user GUI EXE that uses an early-bound DLL to handle abstracted XML messages to send / received data on the serial COM port.  This abstracted XML DLL parses the request and reformats it into machine code for the device and then calls a late-bound DLL to handle the serial I/O.  

As stated this GUI => XML Broker => Serial channel protocol executes as expected on Windows NT or Windows XP.  On Windows Server 2003 it appears that the device is not responding with return messages (XML Broker call to Serial channel times out).

It appears that the outbound data channel is working correctly on any and all platforms, since the device motor resets, as expected at startup.

The GUI EXE is running in Windows 2000 compatibility mode.
[+][-]02/12/08 08:57 AM, ID: 20876572Accepted Solution

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About this solution

Zones: Operating Systems Development, Signal Processing
Tags: Visual Basic 6.0, N/A, N/A
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Solution Provided By: SwissKnife
Participating Experts: 2
Solution Grade: A
 
[+][-]12/07/08 11:37 AM, ID: 23117133Expert Comment

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[+][-]12/07/08 11:41 AM, ID: 23117144Assisted Solution

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