Interfacing with CAN bus

Question

I am looking to write an application in C# and use both ARM based computers and x86 based computers. My question here is when using a J1939 to DB9 cable, do I need a specialized interface for the CAN bus protocol or would a serial port connection suffice?

sweber · Answer

There is a standard for SubD9 connectors being used for CAN by almost any CAN device outside the automotive world. The pinout is:

1: N/C
2: CAN Low
3: Ground
4: N/C
5: Shield
6: Ground (Optional)
7: CAN High
8: N/C
9: Optional voltage to supply small devices

As you see, this isn't RS232, and for sure, your cable is nothing more than an adaptor between both connector types.

You DO need a CAN interface. Most commonly are USB CAN interfaces, but there are also serial CAN interfaces, or even driver ICs, which might be suitable for ARM based systems.

Edgar · Answer

I suggest you google MCP2515 CAN Module.

You will find an interface module which "translates" CAN bus signals to Serial.

And you will find programming examples. I founds several for Arduino.

Interfacing with CAN bus

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