# USRP B210 gpio on J504

**URL:** <https://www.ruby-forum.com/t/usrp-b210-gpio-on-j504/242815>\
**Category:** GNU Radio\
**Created:** [July 30, 2015, 8:54pm UTC](https://www.ruby-forum.com/t/usrp-b210-gpio-on-j504/242815 "2015-07-30T20:54:01Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [July 30, 2015, 8:54pm UTC](https://www.ruby-forum.com/t/usrp-b210-gpio-on-j504/242815/1 "2015-07-30T20:54:01Z")

</div>

Hi, I want to control an antenna multiplxer via J504 gpio port. Actually  
I  
want to have logic 1 and logic 0 in order to switch the multiplxer. But  
it  
is difficult to find gpio example for B210. I have new version of b210  
(green board) and 3.8.005 uhd version. I m very much thankful to if you  
can  
help me with gpio example.