The problem I'm having seems a bit weird. I have two different types of customized PCB (A &
with xbee socket, and a bunch of USB xbee adapter. Among the 7 xbee S3b radios I have, 2 of them would work perfectly fine when installed on both PCB A and B, or USB adapter. But the rest 5 radios won't work at all when installed on PCB A, but works perfectly fine when installed on PCB B and USB adapter. Further investigation indicates that CTS pin of those xbee radios stays high when they are installed on PCB A.
I have tried firmware version 8074 and 8075. Upgrading firmware didn't make a difference.
Could anybody point me to some directions for troubleshooting? One possible reason is, those 5 radios were damaged at some point somehow. But this explanation is not quite satisfactory.
Thanks in advance.