Hi all !
I understand that if the checksum = 0, this means the end of the line formation
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- Thu Mar 21, 2024 10:47 am
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
- Wed Mar 20, 2024 10:02 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
- Wed Mar 20, 2024 9:55 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
- Wed Mar 20, 2024 9:47 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
In this only option, it displays on the screen and after a few seconds the values hang on the screen, but at the same time the diode (port B7) on the board blinks synchronously with the diode on the rs485 transceiver
- Wed Mar 20, 2024 9:30 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
Hi!
Regarding the row of two byte PIDs, for example: engine speed - PID 190, data 087 009 - PID_data[0] /; 087;/ + (PID_data[1] /;009;/<<8) I get a 16-bit value and multiply it by 0.25 (res/bit)
Regarding the row of two byte PIDs, for example: engine speed - PID 190, data 087 009 - PID_data[0] /; 087;/ + (PID_data[1] /;009;/<<8) I get a 16-bit value and multiply it by 0.25 (res/bit)
- Wed Mar 20, 2024 4:20 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
This is brilliant 
I'll be home tonight and try it with a controller.
I'll be home tonight and try it with a controller.
- Tue Mar 19, 2024 4:35 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
- Tue Mar 19, 2024 4:32 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
- Tue Mar 19, 2024 4:29 pm
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
Yes, the length of the frame is always different and the beginning always begins with the name of the control unit (128 is the MID engine) and at the end of the frame there is a checksum byte. But there are other MIDs, for example the 144-central module
- Tue Mar 19, 2024 10:00 am
- Forum: General
- Topic: Protocol j1587
- Replies: 80
- Views: 7363
Re: Protocol j1587
Hi! Here is a fragment of data taken from uart via USB/RS485, you can see there that the packet starts at 0x80 if in hex and in the next screen from special software, j1587 Navigator, from Volvo, and there you can also see that the beginning of the packet starts at 128 in hex 80 But when all the bl...