# Line Passing

**URL:** <https://forums.digi.com/t/line-passing/21930>\
**Category:** XBee & XBee Gateway\
**Tags:** xbee-900hp, line, passing\
**Created:** [October 26, 2020, 9:07am UTC](https://forums.digi.com/t/line-passing/21930 "2020-10-26T09:07:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Cardboard](https://avatars.discourse-cdn.com/v4/letter/c/49beb7/32.png) [@Cardboard](https://forums.digi.com/u/Cardboard)\
**Post date:** [October 26, 2020, 9:07am UTC](https://forums.digi.com/t/line-passing/21930/1 "2020-10-26T09:07:28Z")

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I am trying to set up two Xbee Pro 900HPs.

Device A is the transmitter and takes a digital input.  
Device B is the receiver and outputs the same signal.

I am using the Grove Development board kit and trying to use the User Button for input on Device A and the User LED for output on Device B.

```
Device A	        

```

DH SH from B  
DL SL from B   
D4 Digital Input [3]   
IR 1

Device B  
D4 Digital Out, High [5]

I am expecting the user light on the Grove Development board to turn on when D4 is forced low. Nothing happens to the LED on the Grove board for Device B when I hit the user button on the board for Device A. It looks like B is getting data from A because the Mac Statistics and Timeout show changes after I hit the button for A.

Am I going the right direction with this or way off?

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<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:** [October 26, 2020, 10:39am UTC](https://forums.digi.com/t/line-passing/21930/2 "2020-10-26T10:39:42Z")

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The 900 HP does not support DIO line passing. For the 900 HP you need to use Remote AT commands via API mode to change the output value.