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Author Topic: Sniffing "Bench mode"  (Read 613 times)
terminator
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« on: September 22, 2022, 08:42:51 AM »

I'm trying to sniff the so-called Bosch service mode(bench) protocol, but without success. I tried using Arduino, Tactrix, Scanmatik etc. Nothing. I tried connecting CAN H and CAN L with a 120 ohm resistor and got the same story. I tried changing the speed from 10.4kbps to 500kbps also. If someone has already sniffed it, please give me a hint what I'm doing wrong. I'm guessing the speed is higher than 500kbps but not sure.
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jcsbanks
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« Reply #1 on: September 22, 2022, 08:48:03 AM »

It is probably serial through CAN transceiver.
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terminator
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« Reply #2 on: September 22, 2022, 09:05:20 AM »

I'm not sure I understand you. I would say that I did not understand anything Smiley
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jcsbanks
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« Reply #3 on: September 22, 2022, 01:12:05 PM »

I only briefly looked as it was not what I was interested in, but it appeared to be a serial protocol, not CAN when checked with a logic analyser. It just happens to go through a CAN transceiver, but that does not mean it must use CAN protocol. I might be wrong, but that is what I thought based on a quick look. Hope this helps.
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terminator
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« Reply #4 on: September 22, 2022, 02:36:13 PM »

Ok, thanks, now it's clear.
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