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Having spent much time in the last few weeks poking around with scope & meter at the consult connector in the GTR, and not really getting very far at all, I stumbled across some gem-information out there on the internet.
In particular, some people called the "Nissan Technical e-Group" published a couple of documents describing the protocol & interface specifications, and a (mostly complete) command set and register information.
PLMS developments have published a circuit diagram for an interface to consult, and there's software called "ConZult" (primarily aimed at 300ZX) which can use this interface. Software is pricey though, and not Skyline specific.
Anyway, I took the PLMS circuit diagram and modified it a bit, to make some slight improvements and replace hard-to-come-by components, and created a DIY pcb.
Happily, it worked first time....
153.6 KHz.
For initial testing I used the free version of ConZult- which does hardly anything. It worked fine and I can see real time readouts of lots of signals- AFM voltages, TPS, RPM, Speed, etc etc.
Next steps are to write free, open source software to specifically get at all the Skyline related info.
Plan for further down the line is to create a microcontroller based host with graphic LCD, which can to an extent replicate the functionality of R34's MFD.
I'll keep you posted as the thing develops (if anyone is actually interested that is!!!)
Jon
In particular, some people called the "Nissan Technical e-Group" published a couple of documents describing the protocol & interface specifications, and a (mostly complete) command set and register information.
PLMS developments have published a circuit diagram for an interface to consult, and there's software called "ConZult" (primarily aimed at 300ZX) which can use this interface. Software is pricey though, and not Skyline specific.
Anyway, I took the PLMS circuit diagram and modified it a bit, to make some slight improvements and replace hard-to-come-by components, and created a DIY pcb.


Happily, it worked first time....

153.6 KHz.
For initial testing I used the free version of ConZult- which does hardly anything. It worked fine and I can see real time readouts of lots of signals- AFM voltages, TPS, RPM, Speed, etc etc.
Next steps are to write free, open source software to specifically get at all the Skyline related info.
Plan for further down the line is to create a microcontroller based host with graphic LCD, which can to an extent replicate the functionality of R34's MFD.
I'll keep you posted as the thing develops (if anyone is actually interested that is!!!)
Jon