# IO Specification

:::tip
Draft.

:::

## Power

* Automation bus supply voltage is 12V.
* We use **PhoenixContact** **MC 1,5/ 2-G-3,81** connector for low voltage power distribution.
  * Pin 1 – 12V
  * Pin 2 – GND


## Modbus RTU

Primary bus for critical infrastructure bus is Modbus RTU over RS-485.

* PHY configuration: 115200 / 8N1
* Uses **PhoenixContact** **MC 1,5/ 2-G-3,81**
  * Pin 1 – B
  * Pin 2 – A


 ![3D model of PhoenixContact MC 1,5/ 2-G-3,81 with pin-definition captions](https://storage.yandexcloud.net/bksp-wiki-assets/uploads/298a2e26-87de-4753-a045-717271c8b2f5/77d00d7d-f5ed-4b91-bd56-f22d9cd2a744/image.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=YCAJEMO2-DwUmfLoAY9UdwOXD%2F20260911%2Fru-central1-a%2Fs3%2Faws4_request&X-Amz-Date=20260911T130000Z&X-Amz-Expires=86400&X-Amz-Signature=0f5c09c7f56ac6ccbf3fcd2827cfc66708579e44d9ad22bb24d4694dd78f3838&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject " =455x480")

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**Documents**

- [BKSP 101](https://wiki.bksp.in/s/public/doc/bksp-101-HvrtlzB32F)
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