# Connections for the Chart ActiveX control

The following table shows the connections for the Chart ActiveX control.

Connections | Descriptions
Redraw Required | This connection draws the chart object on each transition from zero to non-zero. The connection is read-only. The connection data type is Analog or Boolean.
Clear Optional | This connection clears the chart area on each transition from zero to non-zero. The connection is read-only. The connection data type is Analog or Boolean.
Data_Source Required | This connection contains the root tag of the chart UDT instance. The UDT must match the definition in the section About User-defined Data Type, otherwise, errors return. The connection is read-only. Tag placeholders are not supported.
ErrorCode Optional | This connection allows the application to manage errors that occur with the chart control configuration. The connection is write-only. The connection data type is Integer.
ErrorMessage Optional | This connection shows the text messages associated with ErrorCode. The connection is write-only. The connection data type is String.

## See also

Chart ActiveX control

Error codes and error messages