> 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/messages-editor-message-fields.md).

# Messages Editor: Message Fields

**Table 1** lists all available fields in the Messages Editor. The [Network](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-pick-a-network.md) selection determines which of these fields are displayed at any given time. For more detail, please click on each field title.

**Table 1: Available Message Fields in Messages Editor**

| Field                                                                                                                                                           | Network                                                           | Short Description                                                                                                                        |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| [Key](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-key.md)                         | Any                                                               | Unique number assigned by Vehicle Spy to the message. This field is read only.                                                           |
| [Description](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-description.md)         | Any                                                               | Text description of the message.                                                                                                         |
| [Type](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-type.md)                       | CAN or LIN                                                        | <p>CAN - Specifies the Arb ID as Standard 11 bit or Extended 29 bit.<br>LIN - Specifies the message as Master, Slave, or Break Only.</p> |
| [Arb ID](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-arbitration-id.md)           | CAN                                                               | Arbitration ID for CAN messages.                                                                                                         |
| [PT, Trgt, Src](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/message-pt-trgt-and-src.md)                                  | <p>J1850 VPW 3 byte hdr<br>ISO9141 / Keyword<br>J1850 PWM<br></p> | Priority/Type, Target, & Source bytes for some types of networks.                                                                        |
| ID                                                                                                                                                              | <p>J1850 VPW 1 byte hdr<br>LIN<br>CGI</p>                         | The one byte message ID for some types of networks.                                                                                      |
| [Multi](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/multiframe-message.md)                | CAN                                                               | Determines if the CAN message is multi-frame and follows the ISO15765-2 or J1939 specifications.                                         |
| Checksum                                                                                                                                                        | LIN                                                               | Selects the Classic or Enhanced checksum type for LIN messages.                                                                          |
| [DLC / Len](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-length.md)                | CAN or LIN                                                        | Expected length of the CAN or LIN message in bytes.                                                                                      |
| [Data Bytes B1 - B?](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-data-bytes.md)   | Any                                                               | Data bytes of the message. Number of data bytes depends upon the network.                                                                |
| [Src Node](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-source-node.md)            | Any                                                               | Source Node (or ECU) assigned to the message.                                                                                            |
| [Tx Message](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/receive-message-tx-msg-field.md) | Any                                                               | Allows you to associate a receive message to a transmit message for auto response, transmit on change, or signal linking.                |
| [Color](/vspy-3-documentation/vehicle-spy-main-menus/main-menu-spy-networks/message-editor/messages-editor-message-fields/message-color.md)                     | Any                                                               | Determines the color of the message in the Messages view.                                                                                |


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