I got two s1 modules.
one connected to a microcontroller and the other one to my pc.
I have no problem to:
1. send data from the mu to the pc via the xbee.
2. send digital i/o from the xbee connected to the pc to the one on connected to the mu.
but when I tried to send data from the pc the mu I found out the there is a lot of "garbage" on the data out.
its disappear when I disconnect the power from the xbee connect to the pc( I have a scope connected to "data out").
(I can't replace them with each other because they are soldered to the boards)
and at that point I am clueless..