user1612: 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)?

user11086: 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

1612: <p>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. </p>

<p>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 <code>Serial.println("ATxx")</code> that would trigger the XBee to send back over UART the status of the pin (high or low)?</p>
 11086: <p>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.</p>

<p>See: <a href="http://ftp1.digi.com/support/documentation/90000982_S.pdf" rel="nofollow">http://ftp1.digi.com/support/documentation/90000982_S.pdf</a></p>
