Add a variable

A variable is created in two steps: first it is defined in the project, then it is assigned to a protocol that will feed it with data.

Define the variable

1. Open Home → Project Configuration → Variables and click +.
2. Fill in the properties: Name (a unique name), Label, optionally Namespace and Description.
3. Choose the Data Type and the Presentation (created in the previous chapter). Leave Length at 1 unless the value is an array.
4. Confirm with Apply — the value size is derived automatically from the data type.

Assign it to a protocol

1. In the same section, pick the Source on the right — the driver + protocol pair that should feed the variable.
2. Move the variable with the arrow button into the Communicated variables of the selected source. (The variable must be applied first.)
3. In the communication detail, set:
   • Direction — the communication direction (Read, Write, ReadWrite),
   • Event — the event deciding when the value is communicated (e.g. a period),
   • Id — the identifier within the protocol; the default is the variable name. For the JSON Signal protocol it is the signal name; for Raw CAN you enter the CAN ID, offset, and byte order in the Comm params field instead,
   • Multiplier — an optional protocol multiplier,
   • Log to FileDataLogger — check it if the variable should be logged (see Logging data).

Assigned variables are marked with a blue badge in the Solution Explorer.

Rules

• A variable cannot be deleted while it is assigned to a source — remove it from Communicated first.
• It cannot be removed from Communicated while it is bound to a control on a workspace.

Next

Let's display the variable values — Create a workspace.