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How is General Purpose IO line pass turned on? Or associated bit to bit?

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Yes, I suppose "General Purpose IO line pass" is what I'm asking about, but the question is . . . what AT command turns it on/off, and what associates which Dn on the input to a Dn on the output? Or . . . is it always on in 802.15.4 devices and always same=same on which Dn is mapped to which Dn? There are examples here http://www.digi.com/blog/videos/xbee-tech-tip-digital-io-line-passing-with-xbee/ and here http://examples.digi.com/sensors/802-15-4-digital-input-with-a-button/ But neither of them (or anywhere else I can find) explain what triggers the association from side to side. Or . . . is it just always on?
asked Jun 7, 2016 in Miscellaneous Hardware and Software by jhumkey New to the Community (3 points)

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See http://knowledge.digi.com/articles/Knowledge_Base_Article/XBee-802-15-4-Digital-Input-Output-Line-Passing/?q=DIo+line+passing&l=en_US&fs=Search&pn=1

It walks you through the configuration.
answered Jun 7, 2016 by mvut Veteran of the Digi Community (15,108 points)
selected Jun 7, 2016 by jhumkey
It is the Addressing you use along with which lines you use.  That is to say, DIO 0 on module one will go to DIO 0 on module 2.