# I/O Line Passing

**URL:** <https://forums.digi.com/t/i-o-line-passing/22892>\
**Category:** XBee - 802.15.4\
**Tags:** o, i, line-passing, xbee3\
**Created:** [January 7, 2022, 8:27am UTC](https://forums.digi.com/t/i-o-line-passing/22892 "2022-01-07T08:27:19Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Steve\_Digital](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@Steve\_Digital](https://forums.digi.com/u/Steve_Digital)\
**Post date:** [January 7, 2022, 8:27am UTC](https://forums.digi.com/t/i-o-line-passing/22892/1 "2022-01-07T08:27:19Z")

</div>

I am using 3 x XB3-24, I have 1 programmed as a coordinator(my receiver) this will control 4 i/ps to an Arduino. I have the first Xbee programmed as End Device ( my transmitter) to Use D0 & D1 they toggle O/P D0 & D1 on Coordinator fine. My 2nd Xbee programmed same way but use D2 & D3 will not turn O/P’s on. i have changed IC to reflect changes, and also changed D2 & D3 to inputs

all modules have been upgraded to same firm ware  
what am I missing?

thanks for any help.  
Steve

---

<div class="post-metadata">

**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [January 7, 2022, 8:38am UTC](https://forums.digi.com/t/i-o-line-passing/22892/2 "2022-01-07T08:38:17Z")

</div>

Steve,

The XBee is a 3V device. The IO lines support voltages of 1.25V to 2.5V based off of the AV command.

---

<div class="post-metadata">

**Author:** ![Steve\_Digital](https://avatars.discourse-cdn.com/v4/letter/s/a9adbd/32.png) [@Steve\_Digital](https://forums.digi.com/u/Steve_Digital)\
**Post date:** [February 10, 2022, 12:22pm UTC](https://forums.digi.com/t/i-o-line-passing/22892/3 "2022-02-10T12:22:27Z")

</div>

Yes, i understand that, I am using the xbee power to provide I/O power.  
I am able to receive signals from one xbee and not the other. I have tested communications between all 3. Something missing cant find