---
title: "Polling a Table"
canonical: "https://docs.rubiconwater.com/space/DC/2048753699/Polling%20a%20Table"
format: markdown
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> Macro (toc)

The host system polls the RTU tables at regular intervals. This confirms that site communications are working, and copies tag data from the RTU to the host database.

# Setting the Table Scan Rate

The polling interval is configured by setting the **Scan Rate **for each table in the Data Sources module. The default value is once per day.

## How does the scan rate determine the polling frequency?

The polling frequency for a table is determined by two factors:

- The scan rate of the table
- The number of tables at a site with the same scan rate.

All tables at the site with the same scan rate are allocated to a group. That group of tables is scanned one at a time, at the specified scan rate. So the polling period of a table in seconds is given by its scan rate multiplied by the number of tables in the group.

> ℹ️ **Example**
> ℹ️ 
> ℹ️ If there are three tables at a site, all with a scan rate of 60 seconds, each table will be scanned every 180 seconds.

## Set the scan rate for a table

1. In the Data Sources module, navigate to the table whose scan rate you want to set.
2. Click **Edit** to display the table properties and enable editing.
3. Set the **Scan Rate** in seconds.
4. Click **Save** to save your changes.

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