Using the ActiveX ChilkatAx-9.5.0-win32.dll version 9.5.0.58. The dll was implemented in both a VB6 and VB.net test app. Each app is used to send commands to an Audio/Video (AV) device. The commands being sent, from both apps, are identical. Please note that the two apps are not run at the same time. The commands are sent via the SendString method with the StringChartset property set to utf-8. When the VB.net test app is used the expected acknowledgement, from the device, is received. However, the VB6 app does not get any acknowledgement back. I set up an emulation app to receive a command and echo the command back. Both app worked as expected. The sent commands were echoed back in both cases. This showed me that the VB6 app is capable of receiving acknowledgement messages. Any suggestions? Thanks, RBO
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