ALDL Datastream, 94 s15 Jimmy 4.3 W

wolf87ca · Post by **wolf87ca** » Thu Apr 12, 2012 8:20 pm

Greetings,
New to the forums here but have been starting to play with datalogging and tunerpro for the past while, so far haven't had much luck. Im working with the 16197427 PCM, with BHRJ Memcal pack, should be $0D mask.

if I am correct, has the 10 pin aldl plug, using pin M for data stream, i tried with the 2 transistor circuit, and a max232 circuit as well using both windows xp/7 serial, and usb-serial connections, but tunerpro rt will just stay at "connecting" and never actually start the stream.

from what I have read the 7427 PCM does not use a 10k Resistor across pins A&B to initiate data stream, nor does it use software flow control to do so, though i have still tried the resistor to no avail, i have tried it using com3 and 4 due to suggestions.

I am using "A218 Trans1 $0D TP5 v250.adx‎" and "Advanced $0D TP5 v250.xdf‎" from the gearhead-efi 16197427 page http://www.gearhead-efi.com/Fuel-Inject ... rmation-OD my apologies, in advance i tend to type in very fragmented thoughts, and am probably missing something, but if there is more to include i will post what i can
Thanks
Tyler

Edit: the ALDL max232 circuit I am using is THIS ONE
the chip I am using is the ST232ACN, as it is what was available to me i have used 0.1uf ceramic caps for c1-c4 +c6 with c5 beinbg a 3.3uf electrolytic, as per the chip specs

Post by **robertisaar** » Thu Apr 12, 2012 9:50 pm

so you've tried using both native serial and serial-USB converters?

being stuck at "connecting" can be caused by the wrong COM port being selected in the preferences menu.

wolf87ca · Post by **wolf87ca** » Thu Apr 12, 2012 10:18 pm

robertisaar wrote:so you've tried using both native serial and serial-USB converters?

Yes, i used an onboard native serial port on one of my laptops, which i recently ended up having to retire and give away, though the serial port was functional and currently I am using a staples branded usb-serial, and also using my arduino's FT232RL in standalone mode with the avr disabled

robertisaar wrote:being stuck at "connecting" can be caused by the wrong COM port being selected in the preferences menu.

haha yeah, i keep hoping I will look in settings and find i was using the wrong com port, i have checked that over again and again though. one thing i have noticed while trying to connect, on both the staples branded usb-serial and the ftdi based one from my arduino, the RX light blinks about every second or two, though i believe this is just tunerpro trying to read the data its expecting to see

Oh, and it appears that the staples usb adapter is made by belkin, not sure what chip it uses, but i will look into that as soon as i get the chance
Thanks
Tyler

Post by **robertisaar** » Fri Apr 13, 2012 7:47 am

generally, the only ICs that work well with the 8192 baud format are the FTDI chips, specifically the FT232R series.

http://www.gearhead-efi.com/Fuel-Inject ... =uber-easy

that's a thread i recently made on the gearhead EFI forum for my latest cable. only two connections necessary(and no MAX232 to deal with) and you just tie the RXD and TXD pins together since the PCM only communicates on the one circuit.

not sure how much info you can use from it, but since the adapter i linked to was originally intended for Arduino usage, i imagine something may be of use to you.

wolf87ca · Post by **wolf87ca** » Fri Apr 13, 2012 9:55 am

Alright, I saw that post on there last night, and was thinking of giving it a go,
When you say tie them together, you mean literally splice the rx, tx, lines together then plug them both into pin M

Tx
-----------¦____________ M
-----------¦
Rx^

Like that? I know the max 232 circuit does that, but with a resistor in line as well I believe, would I add a resistor in this simple style circuit? I just don't want to break anything, hence why I'm trying to be super certain of this,
Thanks
Tyler

Post by **robertisaar** » Fri Apr 13, 2012 10:02 am

with that adapter, no resistor or diode necessary, in fact, those will causes issues.

just like the diagram, bridge the circuits. i'm using it on my bench right now and it's working flawlessly.

obviously, don't forget the ground wire as well.

wolf87ca · Post by **wolf87ca** » Fri Apr 13, 2012 10:13 am

robertisaar wrote:with that adapter, no resistor or diode necessary, in fact, those will causes issues.

just like the diagram, bridge the circuits. i'm using it on my bench right now and it's working flawlessly.

obviously, don't forget the ground wire as well.

Awesome! Thanks so much, I will try that after work and see what happens, though if it works then I'm gonna be pretty disappointed I wasted all this time with max232 and two transistor circuits, anyways I will post back the results
Tyler

wolf87ca · Post by **wolf87ca** » Fri Apr 13, 2012 10:43 am

Hmmmm, so I was just looking up the wiring diagram for my arduino so I could give this a shot, but I have the Arduino Uno, which does not use an FTDI chip like all the others, mine uses an ATMega8U2 AVR programmed as a USB-serial converter, which has replaced the use of the FTDI chip, so I'm thinking it may not work as well, or the same, but I will still give it a shot, and for sure be picking up a couple FTDI interfaces just in case for future use.
Tyler

wolf87ca · Post by **wolf87ca** » Sat Apr 14, 2012 12:56 pm

wolf87ca wrote:Hmmmm, so I was just looking up the wiring diagram for my arduino so I could give this a shot, but I have the Arduino Uno, which does not use an FTDI chip like all the others, mine uses an ATMega8U2 AVR programmed as a USB-serial converter

So to confirm, this actually works, i simply removed the ATmega328 AVR chip from its socket, plugged in the usb cable, and hooked I/O pins 0 and 1 (rx & tx) into M of the ALDL connector and grounded the arduino to pin A, alternatively one can just ground the reset pin so as to not remove the 328, (i bent the pins on mine trying to get it out, luckily they didn't break) this weill prevent the arduino bootloader from starting and allow you to interface the ATMega8U2 directly to the PCM, then opened up tunerpro rt and it connected immediately, with a sample rate of 9-12 hz, this software really is amazing, i maye get my girlfriient to do the laptop for me while we drive today, and take a datalog!
Thanks so much Robertisaar for all your help, and hopefully this will also make it easier to write and Arduino sketch to display a list of stats directly from my PCM
Tyler

EagleMark · Post by **EagleMark** » Sun Apr 15, 2012 3:41 am

wolf87ca wrote: i maye get my girlfriient to do the laptop for me while we drive today, and take a datalog!

Tyler

Got that backwards, get her to drive and you run the laptop! Way more fun!