Questions tagged [j1708]

SAE J1708 is a standard used for serial communications between electronic control units (ECUs) on a heavy duty vehicle and also between a computer and the vehicle.

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RS-485 network with multiple masters

I'm building a project with multiple RS-485 senders ("masters") and one receiver: simulate this circuit – Schematic created using CircuitLab I'm using one MAX485 as receiver connected to a ...
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J1708 (open collector RS485) at higher baud rates than 9600 bps?

I have here a PCB which has a kind of "open collector" RS-485, known as J1708 (schematic attached). The default baud rate is 9600 bps and there is no terminators, J1708-TX is a 3.3V signal. I would ...
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How to create a J1939 ID that have a PGN = 0x130?

I'm trying to create a J1939 message with a PGN equal to 130. But I couldn't determine how the ID is going to look like in order to get that exact PGN. Can you please share a suggestion? Thanks a ...
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Can I connect a “J1708” port to my computer?

This question is related to another question I posted here on the new Reverse Engineering site. I'm working with a small public transit agency on a neat open-source project that will help us to offer ...
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1answer
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J1708 Half Duplex Collision Detection

SAE J1708 is basically an RS485 hardware interface without the typical 120 ohm termination resistors. In typical applications, a half-duplex RS485 transceiver chip is used to connect to the bus. In ...