XBee on Arduino Fio - how to read the status of a local digital XBee output pin? I am using a Fio to control a set of relays. The unit uses an XBee (series 1 Pro) in transparent mode to receive commands over serial UART and everything works fine. The XBee is also configured for digital Input/Output Line Passing and the XBee on the Fio "mirrors" on an output pin the input state on a remote XBee and also this works fine. 

How can I interrogate from the Fio the state of the output pin (e.g. D0) of the local (receiving) XBee? Is there an AT command that I could send via Serial.println("ATxx") that would trigger the XBee to send back over UART the status of the pin (high or low)?
You cannot read the state of output pins via an AT command, you can only read the state of input pins using the ATIS command.

See: http://ftp1.digi.com/support/documentation/90000982_S.pdf