I don't know the answer to your specific question, but you might want to try updating the firmware on your RS507 if it is not behaving as you expect. I know the original versions worked well with our CE and Windows Mobile based devices, but I think you may need updated firmware to talk reliably to other devices.
Here's a link to an older firmware update. The reason I share this is that this is where you can find the PC firmware updater tool.
Here's a search for firmware. .
Looks like this hotfix has the newest version of firmware for the RS507 as of today
Here's the product reference guide. This explains how to update the firmware along with other things about the RS507.
Thank you very much for the help.
I tried to download the latest firmware, but I am not entitled. Could you please give me permission to down load it?
The SN for the RS507 is :13289000501877.