# RCM4010

**URL:** https://forums.digi.com/t/rcm4010/9266
**Category:** Rabbit
**Created:** [March 27, 2008, 8:14pm UTC](https://forums.digi.com/t/rcm4010/9266 "2008-03-27T20:14:06Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![victor1](https://avatars.discourse-cdn.com/v4/letter/v/6de8d8/32.png) [@victor1](https://forums.digi.com/u/victor1)
#### Post date: [March 27, 2008, 8:14pm UTC](https://forums.digi.com/t/rcm4010/9266/1 "2008-03-27T20:14:06Z")

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I have a problem with the module RCM4010

When I read the port D, I always obtain 0xFF value, but I expect to obtain 0x00. Of course, I don’t have anything connected to port D.  
I have the port D configured as input.

Anybody could post an example of configuring the port D as input, and how to read and store the result on a variable ?

Thanks,  
Victor