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CAN Bus Communications Decoded: Plan Your Network

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Plan Your Network


00:00 - In this section of the course, we're going to go through our HPA CAN bus network setup 5 step process.
00:07 This allows us to set up a CAN system from scratch in a performance automotive application using aftermarket electronic components.
00:14 We'll lay out the steps here and you can also see them being performed on real projects in the works examples section of the course.
00:21 The first step we need to undertake is to map out and make a list of all the devices that will be connected to the bus.
00:28 This is often undertaken in parallel with the wiring harness design process because there is a lot of overlap between these two tasks.
00:35 It's common to connect any device in the system that has a CAN interface to the bus, even if it's not currently required to transmit or receive any data.
00:44 Having the flexibility there for future modifications doesn't cost a lot of build time but can be a real timesaver down the line.
00:52 This initial step requires you to read and understand the CAN communications section of the documentation provided for all the devices on the bus to confirm that they're going to be compatible with one another.
01:04 The items that you need to pay particular attention to are the communication speeds the device can be configured for, if the device has fixed or programmable termination resistors and if the device transmits or receives on fixed or programmable PIDs.
01:19 Once all this information is recorded we can now make sure that every device on the bus can communicate at the same speed, that there won't be any PID conflicts and also determine where termination resistors will need to be enabled or manually added to follow our physical bus wiring rules outlined in module 2 of the CAN bus technical theory section of the course.
01:41 I strongly advise you to undertake this step before making any component purchases for your project and lean towards purchasing devices that offer flexibility in their configuration.
01:52 Often devices with fixed transmission speeds or PIDs can be modified by the device manufacturer before they're shipped which allows you to side step a possible incompatibility issue.
02:03 The key idea in this first step is to ensure that all your devices are going to be able to communicate with one another at a hardware level.
02:10 By that I mean that all the devices can transmit and receive at the same speed and that there aren't any conflicts between devices that transmit and receive on fixed PIDs.

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