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docs: update Canbus_Support2

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dazq 2020-12-16 23:04:26 +00:00 committed by Josh Stewart
parent ce00401536
commit 959b0a9a1b
1 changed files with 5 additions and 3 deletions
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Canbus_Support2.md
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@ -2,7 +2,7 @@
title: CanBus Support
description:
published: true
date: 2020-12-16T23:02:04.190Z
date: 2020-12-16T23:04:20.281Z
tags:
editor: markdown
dateCreated: 2020-12-15T21:58:51.731Z
@ -113,13 +113,15 @@ CAN bus may also be used for communication beyond the standard OBD messages. Phy
#### Query
The functional PID query is sent to the vehicle on the CAN bus at ID 7DFh, using 8 data bytes. The bytes are:
The functional PID query is sent to the vehicle on the CAN bus at ID 7DFh, using 8 data bytes.
The bytes are:
![11bit_query.png](/11bit_query.png)
#### Response
The vehicle responds to the PID query on the CAN bus with message IDs that depend on which module responded. Typically the engine or main ECU responds at ID 7E8h. Other modules, like the hybrid controller or battery controller in a Prius, respond at 07E9h, 07EAh, 07EBh, etc. These are 8h higher than the physical address the module responds to. Even though the number of bytes in the returned value is variable, the message uses 8 data bytes regardless (CAN bus protocol form Frameformat with 8 data bytes). The bytes are:
The vehicle responds to the PID query on the CAN bus with message IDs that depend on which module responded. Typically the engine or main ECU responds at ID 7E8h. Other modules, like the hybrid controller or battery controller in a Prius, respond at 07E9h, 07EAh, 07EBh, etc. These are 8h higher than the physical address the module responds to. Even though the number of bytes in the returned value is variable, the message uses 8 data bytes regardless (CAN bus protocol form Frameformat with 8 data bytes).
The bytes are:
![11bit_response.png](/11bit_response.png)