# Handshake

A read connection. You can assign a tag or an expression to this connection. The application reads the value of this connection at the data source, and resets the button to its unlatched state when this connection changes to meet the conditions of the LatchResetType property.

If you assign an expression, the application calculates the value of the expression and resets the button to its unlatched state when this connection changes to meet the conditions of the LatchResetType property.

## See also

LatchResetType