We're currently shopping for a BT>RS232 converter to use as a serial cable 
replacement, with a BT>USB module similar to this one on the other end:

http://www.sparkfun.com/commerce/product_info.php?products_id=150

The product we're plugging it into has +5V on pin 9 to power the module. The 
module has to be "transparent" as far as the device and the host application 
running on the PC are concerned.

After doing some research, I can't believe how limited our options are. The 
modules I was able to find cost $49 in OEM quantities (compare that to $15 
for BT>USB in _single_ quantities!).

We will likely require thousands of these BT units, so it probably makes 
sense to either manufacture a BT>RS232 converter ourselves, or build a 
different version of the device with BT built-in. My experience with 
Bluetooth is rather limited, can someone point me in the right direction? 
Perhaps there are schematics for something like this already out there? I'd 
also love to hear about your experiences with different BT chips.

Best regards,

Vitaliy 

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