Hello,

I'm trying to write a PDA program in VB2005 that communicates with and records data from a data acquisition (DAQ) system via bluetooth (BT), but I've run into a strange connection/communication problem.

After reading Wei-Meng Lee's Programming Serial Ports Using VB2005 (http://www.dev-archive.com/dotnet/Article/31001/0). I was able to create a simple desktop application that successfully setup a BT connection with the DAQ and could send it a few commands. Then, I wrote code for the PDA that was pretty much identical-- the only serial port functions I used were IsOpen, Write, and Close. but here's what happens:

When I run the VB PDA program, it seems like the PDA-DAQ BT (virtual COM)connection sets up OK, but the DAQ doesn't respond to any of the commands I send (write to) it. However, if I disconnect and then open a new PDA-DAQ BT connection, the last command I sent in the original connection executes. This will even happen if I make the reconnection with the Bluetooth Manager after the VB PDA program is shut down.

Any ideas what I might be doing wrong?

I'm using MS Visual Studios Standard Ed and a Dell Axim X50 with Windows Mobile 2003 Second Edition.

thanks in advance,
Luan