Help interfacing Tunerpro with 1989 Corvette!

[VL400]

Yep you need bi-directional comms for reading, writing and logging now its running 12P. Grounding D11 will spit out a data frame automatically much like the old memcal was doing with the 10k resisitor. You can only get about 5 frames per second grounding D11 instead of 10 with bidrectional comms.

[redcamaro]

The 1227165 ECU already has 8192 baud and a UART chip on the board, unlike the Holden 1227808 which only supports 160 baud.

Is it possible to get 'bi-directional comms' (i.e. read & write) by interfacing an NVRAM upgraded (with write wire) 1227165 with one of these http://www.ebay.com/itm/Arduino-FT232RL ... 3cbfdfc861 whether it be on the board or through the ALDL?

[antus]

Yes that will work. You just need a diode and a resistor on the tx and rx pins, join then together and hook that up to the '165 aldl line. I assume its usb powered. This example is rs232, but the ecu side connections are the same. This is not very tidy, but illustrates what you need.

https://pcmhacking.net/forums/view ... =10#p14542

[charlay86]

linking the Tx & Rx gives you the bi-directional communications, which is necessary since OSE12P typically* only sends data in response to a data request (e.g. an ALDL Mode 1 frame).
You should be able to log using the standard 12P adx if it is working correctly.

* = unless using pin D11 method.

[redcamaro]

Nice one.

I can't quite make out the colour bands on the resistor. Is that a 1k0 resistor on the RX pin and 1N914/1N4148 Small Signal Diode with anode on the TX pin and Cathode facing the ECU adapted from http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm

Yes the prototyping board is a USB (MAX232) FT232RL ... so does it still want the V5 wire?

Can that be connected inside the 808 (&/or 1227165) ECU?

--

I'm sure you've seen these posts Antus, but they're attached here for the benefit of other delcohackers. These posts on thirdgen.org are relevant http://www.thirdgen.org/techboard/diy-p ... y-via.html & http://www.thirdgen.org/techboard/diy-p ... erter.html

[charlay86]

I can't quite make out the colour bands on the resistor. Is that a 1k0 resistor on the RX pin and 1N914/1N4148 Small Signal Diode with anode on the TX pin and Cathode facing the ECU adapted from http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm

it is a 1k ohm resistor.
yes you are correct, the techedge diagram has the diode backwards.

Yes the prototyping board is a USB (MAX232) FT232RL ... so does it still want the V5 wire?

No, +5v is not necessary for you as it comes from USB.

Can that be connected inside the 808 (&/or 1227165) ECU?

Sure can

[redcamaro]

where can it connect inside the ECU, like this post describes without the 5V?

https://pcmhacking.net/forums/viewtopic.php?f=11&t=173

[charlay86]

I've never seen a '165 so I can't tell you a specific location, but if it were me I'd probably solder the resistor and diode to the serial interface board, trace the ALDL pin from the ECM's external connector to inside the ecm and then solder the Tx/Rx wire from the serial board onto that trace wherever it is convenient. Next find a nice place to solder on a ground wire.
Cut a nice rectangular hole in the case for the USB connecter and mount the board inside.
Then take some photos of your new USB enabled '165 to show everyone (after you test it of course!).

[redcamaro]

Thanks charlay86, just testing the setup externally now...

It can connect and log, but not sure if write or RT is working... how can writing be tested with Tunerpro v5.0?

I also tried to connect with OSE flashtool without any success.