> 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/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type.md).

# Message Signal Type

The [Signals in Message](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals.md) area at the bottom of the Messages Editor provides different ways to change the Signal Type:

* Click in the **Signal Type** column and make a pulldown list selection.
* Double click on blue signal bits to open the Edit Signal dialog (Figure 1).
* Click the ![](https://cdn.intrepidcs.net/support/VehicleSpy/assets/fxedit.gif) button to open the Edit Signal dialog (Figure 1).

![Figure 1: The Edit Signal dialog can change the signal type for a signal in a message.](https://3170208387-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FL6lcovCpkhoS9uTOFtEp%2Fuploads%2Ffc0b8Y2kKdg7K0VkusFi%2Fspyinvaltype.gif?alt=media\&token=83c31988-f21c-4dec-8251-2395f89b0563)

The Edit Signal dialog customizes itself based upon the Signal Type selection. **Table 1** briefly describes each Signal Type and gives a few examples. Click on a Signal Type name to see further details for that type.

**Table 1: Signal Types**

| Signal Type                                                                                                                                              | Description                                                                                                                                          | Examples                                                                      |
| -------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- |
| [Analog](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type-analog.md)               | Continuous numbers.                                                                                                                                  | Engine RPM, Coolant Temperature, Throttle Position, Vehicle Speed             |
| [Digital](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type-digital.md)             | Binary, boolean, on/off type information.                                                                                                            | Park Brake Active, Cruise Control Active, Door Ajar                           |
| [State Encoded](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type-state-encoded.md) | List of text descriptions which equate to specific values.                                                                                           | Transaxle Shifter State (PRNDL), Power Mode                                   |
| [Text](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type-text.md)                   | ASCII text information.                                                                                                                              | VIN, Message Center                                                           |
| [DTC](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-signals/message-signal-type-dtc.md)                     | Diagnostic trouble code.                                                                                                                             | Trouble codes stored in ECUs such as: "P0142 - 02 Sensor Circuit Malfunction" |
| GMLAN                                                                                                                                                    | GMLAN signal types cannot be created manually. They are automatically generated from GMLAN databases that contain USDT and UUDT diagnostic messages. |                                                                               |
| ODI                                                                                                                                                      | ODI signals cannot be created manually. They are automatically generated from .fuclass files.                                                        |                                                                               |


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