Could somebody provide some help, please. I want to but a nice package to work on my Commodore VX 2002(Australia). I have downloaded the demo version V4 and have problems establishing coms, I think.
I built a small circuit using a MAX 232 dual line TRX. I seems to work OK and it echos back any chars I send it. I tested it with my BERT up to 38400 with no errors.
I connected it to pin 9 on the ODBC2 plug under the steering (used gnd and +12 v from there too).I get a steady flow of data on my serial analyser with the IGN off.
I get data flow with the IGN on. I think there is something wrong with the
serial data but don't know. At times I select a Macro to run and the DTC pane turns green and there are a number of items listed in it. They never seem to change.
What I want is the dials page to work. I tried the other model Commodore XLM files but the software complained more about incorrect data headers.
I have had a CRO on the data and it looks about right for TTL, swings right down to ground both ways and up to +5. Frequency looks close but haven't measured the bit width.
The top of the screen is just clicking the green stop sign icon. Sometimes (without my understanding)it runs indefinitely usually just a second or so with "Com timeout expecting header frame".
The green chatter icon and the one next to it both seem to display data.. I have noticed the engine fan and the Engine check lamp do go on, which seems to indicate some sort of communication on the ECU bus.
I am really stuck and would appreciate any help.
I have tested the car with a CARMA scantool and it work OK.
I get with the green stop icon
Start macros:Engine data
Synchronizing ALDL comms....
waiting for heartbeat:$08,$55$A3
waiting for ALDL bus silence for 50 ms
send: $f5,$57,$01,$01,$82
comm timeout expecting header byte
with Display chatter and Auto detect chatter I get loads of green data all byte of $(hex?) with the occassional "comm timeout expecting header byte"
Graeme