# Set up connections for the string input enable button (Connections tab)

## To set up tags and expressions for the button

1. In the Graphics Display editor, double-click the button to open its Properties dialog box.
2. Click the Connections tab.
3. Assign a tag or expression to these connections:

   Value

   A write connection. Assign a tag that can support up to 82 characters (bytes). When the operator presses the Enter key, the application writes the alphanumeric string to the tag's data source.

   If you do not assign the Value connection, at run time when the operator presses the button the pop-up does not open.

   Enter

   A write connection. Assign a tag to this connection. This connection accepts values of 0 and 1 only. The connection determines how long the Enter key press is registered. Use this connection for Enter key handshaking.

   Enter Handshake

   A read connection. You can assign a tag or an expression to this connection. This connection resets the Enter connection, using the Handshake reset type option specified in the Timing tab. Use this connection for Enter key handshaking if you want the Enter connection to be reset when a value at the data source changes.

   If you assign an expression, the application calculates the value of the expression and resets the Enter connection when the expression value meets the conditions of the Handshake reset type option.

## See also

Create string input enable buttons

How the string input enable button works at run time

How Enter key handshaking works at run time

Columns on the Connections tab of a graphic object's Properties dialog box