> For the complete documentation index, see [llms.txt](https://docs.intrepidcs.com/vspy-3-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.intrepidcs.com/vspy-3-documentation/3.9.17/vehicle-spy-main-menus/main-menu-scripting-and-automation/function-blocks/function-blocks-types/script-type-function-block-commands/script-type-function-block-command-load-message-data.md).

# Script Type Function Block Command: Load Message Data

### Command Description

This command loads byte data from a file into a [transmit message](/vspy-3-documentation/3.9.17/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-receive-transmit-and-database-tables.md). You can use it to set the contents of a message before sending it out.

### Value Field Parameters

Double-click in the **Value** field to launch this command's parameter dialog box (Figure 1). There are several settings here.

![Figure 1: Parameter setup for the Load Message Datacommand.](https://content.gitbook.com/content/ZqysKgxMTlY1CiNX5qrT/blobs/2BhvokWD9uQP4mgeeSbp/fb_load_message_data.gif)

### Start Index

The value of the first byte of data in the file to load. This is specified as an [application signal](/vspy-3-documentation/3.9.17/vehicle-spy-main-menus/main-menu-scripting-and-automation/application-signals.md) (**Message Data Start Value** in our example in Figure 1) that should be declared ahead of time and set to the correct figure.

### Length

The length of the data, in bytes, to load from the file. Again this is specified not directly but rather through an application signal (**Data Length** in Figure 1).

### Filename without extension (\*.msgbin)

This is the name of the actual file from which to load data. The file must have a **.msgbin** extension and be located in the [data directory](/vspy-3-documentation/3.9.17/basic-operation-of-vehicle-spy/data-directory.md) of the current user.

### Fast load data

When this optional setting is checked, data will be stored in flash memory, if possible, instead of RAM. This frees up more RAM for other purposes.

### Transmit Message

The transmit message to receive the data:

* **Message:** The actual transmit message, selected through a drop-down box (this is **Outgoing Data Transmission** in Figure 1).
* **Byte Start Index:** Specifies the first byte of the transmit message into which data should be loaded.


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