# Set up connections for the numeric input cursor point (Connections tab)

## To set up tags and expressions for the numeric input cursor point

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

   Value

   A read-write connection. Assign a tag to this connection. When the operator presses the pop-up's Enter key or ramps a value, the application writes the numeric value to the tag’s data source.

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

   Optional Expression

   An optional write connection. Assign a write expression to this connection.

   The application calculates the value of the expression and writes the result to the Value connection. All write expressions must contain a question mark (?) as a placeholder for the value the operator enters at run time.

   If the decimal point type is Fixed position, and the "Digits after decimal point" value is not 0, the decimal point is removed from the displayed value and the resulting value is used.

   Indicator

   A read connection. You can assign a tag or an expression to this connection. The application reads the value of the connection at the data source, and updates the object’s display to reflect the state corresponding to the value.

   If you assign an expression, the application calculates the value of the expression and updates the object’s display to reflect the state corresponding to the value.

   If you assign this connection, the cursor point does not display the value sent to the Value connection until it receives a response from the Indicator connection. If you do not assign this connection, the cursor point's state corresponds to the value at the Value connection.

   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.

   Example: Write expressions

   Minimum

   An optional read connection. If the Use variable Minimum/Maximum check box on the Numeric tab is checked, assign a tag or an expression to this connection. If the check box is not checked, this connection is not read.

   The application reads the value of the tag or expression to determine the minimum value the object can write to the data source.

   Maximum

   An optional read connection. If the Use variable Minimum/Maximum check box on the Numeric tab is checked, assign a tag or an expression to this connection. If the check box is not checked, this connection is not read.

   The application reads the value of the tag or expression to determine the maximum value the object can write to the data source.

## See also

Configure the numeric input cursor point (General tab)

Set up numeric options for the numeric input cursor point (Numeric tab)

Set up handshaking for the numeric input cursor point (Timing tab)

How the numeric input cursor point works at run time

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