[Information] ALDL Basics

[VL400]

Its an ask and ye shall receive system, and asking for a specific message. The command for mode 1 message 5 would be F5, 57, 1, 5, AE, the PCM then responds with message 5

[marcwolf]

Thanks for that. I wondered about some of the redundant fields.
Dave

[marcwolf]

Hi VL400

Looking at the VS_Mode1 file in details it looks like that one really only needs Message 0 as it has all of the information in it. Message 1,2,3 just seems to have duplicated info

Was this what you found in your coding experiments?

Also with the WORD is it LSB MSB or MSB LSB when one is doing numeric conversions (Apologies to all non-geeks here but they DO mean something )

Where you have a value that runs over 4 bytes (2 words) is it first word/second word or second word/first word order.

Again many thanks
Dave

[charlay86]

you request which mode 1 message you would like. The first few bytes of the message you send are composed of:

for example - 0xF5 0x57 0x01 0x00 0xB3

1. 0xF5 : the device ID that you are addressing
2. 0x57 : the length of the data in this message (not including this byte, the previous byte or the checksum) + 0x55
3. 0x01 : the ALDL mode, in this case mode 1
4. 0x00 : the message number that we are requesting (this is required in mode 1, other ALDL modes vary in format)
5. 0xB3 : 2's complement checksum

Words are msb lsb. afaik there are no 4 byte values in the ALDL stream.

Other messages are shorter so you can achieve higher logging speeds, and they also do contain more information not found in message 0.

[matt304]

Hi
I have been tryung to log with my USB ALDL on VR V8. Can not seen to get it to work on Tunepro rt or winaldl. Have used the BINs and other coding off this site. I have check the com port. And have tryed with windows xp and 7. Thinking it may be the car?? Can anyone help
Thanks Matt

[VL400]

What car are you trying to log? That will determine which ADX you will require from here .. https://pcmhacking.net/forums/viewtopic.php?f=10&t=29

There is a guide on getting started here .. https://pcmhacking.net/forums/viewtopi ... =10&t=2223

Also try the flashtool (https://pcmhacking.net/forums/viewtopic.php?f=3&t=82) and do a get bin. It can help to determine if its a software or hardware issue.

[matt304]

Vr V8 auto 1994. I was using adx file VR $11 TP5 ADX.

[VL400]

The "VR_$11_v1.04-tp5.adx" should work fine, and can confirm it works on my car ok. From the TP logging guide where do you get up to before having problems?

Does the flahtool connect? If not are you getting any errors?

[matt304]

I did not have the RS232 Echo box checked. Hard ware is not connecting.Saying cable is found. Bottom of screen is "Not Emulating" "Hardware not found" "DA:Not Connected. Connected to car again. Not working. Checkes DLC in car. Has power and earth. All looks ok

[ejukated]

has anyone tried logging the ABS module for wheel speed?