# Message Capture Method: Restart Options

In [VehicleScape DAQ](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-online-tab) [Standalone Logging](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab), a number of restart options are available for the [Message Capture](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab/standalone-logging-collections-and-methods/collections-and-methods-message-capture-method) method. There are three possible choices, but which ones are available depends on the selected [Start Option](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab/standalone-logging-collections-and-methods/collections-and-methods-message-capture-method/message-capture-method-start-options) and [Stop Option](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab/standalone-logging-collections-and-methods/message-capture-method-stop-options).

### Start Option = Start Immediately

In this case there are two restart options with the **Force restart** option grayed out (Figure 1):

* **Do not restart the collection when finished:** End logging after data has been captured.
* **Restart the collection when finished:** Start logging again after initial data capture.

![Figure 1: Restart Options when Start Option = Start immediately.](https://content.gitbook.com/content/9uNvoSkR7R6QY16gR3CY/blobs/H1jxneY7nwR04DMRgNI0/spyvssalrestartoptions_immediately.gif)

### Start Option = Start When Expression is True

In this case there are three restart options. The option controls what happens after [the correct number of messages are collected or the finish expression is true](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab/standalone-logging-collections-and-methods/message-capture-method-stop-options/message-capture-method-stop-options-finish-after-collecting-messages-or-when-expression-is-true):

* **Do not restart the collection when finished:** End logging.
* **Restart the collection when finished:** Start logging again when the start expression is again true.
* **Force restart (do not wait for start expression):** Restart again regardless of the condition of the start expression.

Figure 2 shows the three options.

![Figure 2: Restart Options when Start Option = Start when expression is true.](https://content.gitbook.com/content/9uNvoSkR7R6QY16gR3CY/blobs/zcmmpx8qeZI9fhrTMhlq/spyvssalrestartoptions_using_trigger_expression.gif)

### Start Option = Start Using Trigger Expression

There are again here three basic restart options, but which appear depends on other settings made in the Standalone Logging area:

* **Do not restart the collection when finished:** End logging. This option is always available unless the [Pre/Post Collection Method](https://docs.intrepidcs.com/vspy-3-documentation/3.9.14/vehicle-spy-main-menus/main-menu-measurement/vehiclescape-daq/vehiclescape-daq-standalone-logging-tab/standalone-logging-collections-and-methods/message-capture-method-stop-options/message-capture-method-stop-options-pre-post-collection) is selected and the **Stop on expression** box is checked (which makes the **Do not restart** option here irrelevant, so it is grayed out).
* **Restart the collection when finished:** Start logging again; if triggering based on when an expression is true, do so when the start expression is true again. This option is always available.
* **Force Restart:** If **Trigger when expression is true** is selected, and the **One-shot Report** Stop Option is chosen, this item is enabled to allow restart regardless of the condition of the start expression.

**Note:** For Pre/Post Collection, choosing **Restart**will erase the oldest capture with new data.

Table 1 summarizes which restart options are available based on selected Standalone Logging settings. Figure 3 shows an example where **Trigger when expression is true** and **One-shot Report** are both selected.

**Table 1: Available Restart Options Based on Trigger Event and Stop Option Settings**

| Trigger Option                                                                                | Pre/Post Collection without Stop on Expression Checked | Pre/Post Collection with Stop on Expression Checked | One-shot Report                                  |
| --------------------------------------------------------------------------------------------- | ------------------------------------------------------ | --------------------------------------------------- | ------------------------------------------------ |
| Trigger when expression is true                                                               | Do Not Restart, Restart                                | Restart                                             | <p>Do Not Restart, Restart,<br>Force Restart</p> |
| Trigger when expression changes                                                               | Do Not Restart, Restart                                | Restart                                             | Do Not Restart, Restart                          |
| Trigger when expression increases / decreases / changes / exceeds constant and then decreases | Do Not Restart, Restart                                | Restart                                             | Do Not Restart, Restart                          |

![Figure 3: Restart Options when Start Option = Using Trigger Expression, the Trigger when expression is true suboption is selected, and the One-shot Report Stop Option has been chosen.](https://content.gitbook.com/content/9uNvoSkR7R6QY16gR3CY/blobs/Ktb0XkLDfDC89p5Wjaaq/spyvssalrestartoptions_when_expression_is_true.gif)