# Getting started with RevPi Core and Balena OS

**URL:** <https://forums.balena.io/t/getting-started-with-revpi-core-and-balena-os/251351>\
**Category:** Product support\
**Created:** [February 8, 2021, 4:05pm UTC](https://forums.balena.io/t/getting-started-with-revpi-core-and-balena-os/251351 "2021-02-08T16:05:08Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![rahul-thakoor](https://avatars.discourse-cdn.com/v4/letter/r/9de053/32.png) [@rahul-thakoor](https://forums.balena.io/u/rahul-thakoor)\
**Post date:** [February 25, 2021, 10:00am UTC](https://forums.balena.io/t/getting-started-with-revpi-core-and-balena-os/251351/15 "2021-02-25T10:00:32Z")

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Hey @savnik,

> To my understanding the config.rsc file contains information on the IO modules and the position relative to the Core Module. A I/O module placed on the left side of the Core module will have a different config.rsc than if the I/O module is placed on the right side of the Core module.

Thanks for the tip

I do not have a similar device to test,. Referring to the [piTest documentation](https://revolution.kunbus.com/tutorials/software-2/pitest/), I would suggest

- try to read the value of the `RevPiLED` variable using `./piTest -r RevPiLED` ?
- Are you able to use `piTest` to toggle other pins? eg `O_1`, `O_2` etc
- [Are you using a privileged container](https://www.balena.io/docs/learn/develop/hardware/)? can you please confirm if you have the following device: `/dev/piControl0`? piTest controls peripherals via this device based on [the source](https://github.com/RevolutionPi/piControl/blob/master/piControl.h#L59)
- I saw you commented on the [other forum thread](https://forums.balena.io/t/kunbus-revolution-pi-revpi-core-3-and-dio-module/36197/12)

> COPY config.rsc /etv/revpi/config.rsc  
> Hi, I’am trying to reproduce this in my own setup.  
> Is it a typo or intention in the path /etv/… ?

I believe it is. If you want to modify the file when building the image, it should be `COPY config.rsc /etc/revpi/config.rsc`

I hope this gives you enough to continue debugging.

Cheers

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