# Development of ARINC 825 protocol on Pixhawk **URL:** \ **Category:** Uncategorized\ **Created:** [April 24, 2019, 12:10pm UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621 "2019-04-24T12:10:43Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Mo5tar97](https://discuss.px4.io/user_avatar/discuss.px4.io/mo5tar97/32/3967_2.png) [@Mo5tar97](https://discuss.px4.io/u/Mo5tar97)\ **Post date:** [April 24, 2019, 12:10pm UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/1 "2019-04-24T12:10:43Z")
Hello I am supposed to build a triplex redundant model using 3 Pixhawks communicating with each other over the CAN BUS they are supposed to use the ARINC 825 protocol for a first task I must receive a message over the CAN BUS which make the led on the Pixhawk Blink so any suggestions where can I start ? Thanks in advance. ---
**Author:** ![auturgy](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/e480ec/32.png) [@auturgy](https://discuss.px4.io/u/auturgy)\ **Post date:** [April 25, 2019, 1:30am UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/2 "2019-04-25T01:30:20Z")
What flight stack is the target: ArduPilot or PX4? Makes a huge difference to how this would need to be approached. ---
**Author:** ![Mo5tar97](https://discuss.px4.io/user_avatar/discuss.px4.io/mo5tar97/32/3967_2.png) [@Mo5tar97](https://discuss.px4.io/u/Mo5tar97)\ **Post date:** [April 25, 2019, 5:24am UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/3 "2019-04-25T05:24:12Z")
I am targeting the PX4… But why would it matter ? ---
**Author:** ![auturgy](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/e480ec/32.png) [@auturgy](https://discuss.px4.io/u/auturgy)\ **Post date:** [April 25, 2019, 6:41am UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/4 "2019-04-25T06:41:06Z")
Different way that canbus is implemented. ArduPilot has a can layer, with hooks to implement whatever protocol you want underneath: their implementation was designed to support multiple protocols (and does). With PX4 it’s just uavcan. You’ll have to either replace uavcan with arinc 825, or design a way to enable px4 to support more than one can protocol, which would be quite a bit more work. If you need arinc 825, replacing uavcan would be easier. ---
**Author:** ![Mo5tar97](https://discuss.px4.io/user_avatar/discuss.px4.io/mo5tar97/32/3967_2.png) [@Mo5tar97](https://discuss.px4.io/u/Mo5tar97)\ **Post date:** [April 25, 2019, 8:00am UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/5 "2019-04-25T08:00:52Z")
Ok if i need to replace the UAVCAN on the PX4 With the ARINC825 is there is a good way to say maybe a way to replace the code used for decoding the serial message and replace it with my own code Thanks in advance ---
**Author:** ![auturgy](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/e480ec/32.png) [@auturgy](https://discuss.px4.io/u/auturgy)\ **Post date:** [April 25, 2019, 9:57am UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/6 "2019-04-25T09:57:42Z")
All the dsdl source is auto generated based on the definition files. You can look at how it’s implemented here: [https://github.com/PX4/Firmware/tree/master/src/drivers/uavcan](https://github.com/PX4/Firmware/tree/master/src/drivers/uavcan) ---
**Author:** ![Mo5tar97](https://discuss.px4.io/user_avatar/discuss.px4.io/mo5tar97/32/3967_2.png) [@Mo5tar97](https://discuss.px4.io/u/Mo5tar97)\ **Post date:** [April 25, 2019, 12:03pm UTC](https://discuss.px4.io/t/development-of-arinc-825-protocol-on-pixhawk/10621/7 "2019-04-25T12:03:59Z")
ok I will take a look at it thank you 😄