## Function Selection Page

### Overview
The "function selection" page serves as the central hub for configuring various functionalities of the device. From this page, you can enable or disable a wide range of parameters and modules.

### Key Parameters
- **Ac brand/type**: This parameter selects the type of device that controls which brand the device is compatible with. If selected incorrectly, downloading will fail.
- **Heartbeat**: Enables or disables the device's operational status indicator.
- **Air Conditioner Count**: Sets the number of air conditioner units connected to the gateway (0-16), enabling the corresponding module.
- **Input Count**: Sets the number of inputs (0-3), enabling the corresponding module.
- **Math Count**: Sets the number of math modules (0-16), enabling the corresponding module.
- **Scene Count**: Sets the number of scene modules (0-4), enabling the corresponding module.
- **Timer State**: Activates the timer function of the device.

### Purpose
- To provide a centralized interface for configuring the device.
- To enable or disable specific functionalities based on the project requirements.

### Usage
This page should be accessed during the initial configuration in the ETS software. Carefully select the parameters and modules to match the actual hardware and project needs.