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Old 07-11-2012, 10:01 PM   #1 (permalink)
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Default ALDL Serial interfacing

Getting Rhinopower to read data from my car's ALDL based ECU is driving me nuts. There's about a dozen different diagrams available online ranging from simple resistor and transistor setups to ones that use a full MAX232 and then of course there's the USB-only adapter Rhinopower themselves sell for way too much. I already tried one serial adapter and that both didn't work and blew up my ECU. What's the best method of getting a rhinopower compatible data stream out of an ALDL ECU?
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Old 07-11-2012, 11:07 PM   #2 (permalink)
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Since you're posting in a Suzuki forum, I'm going to assume you have a Suzuki, in which case, you don't have an ALDL interface, it's SDL - a proprietary Suzuki serial data link.

Out of curiosity, how much is Rhinopower asking for their interface?
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Old 07-11-2012, 11:39 PM   #3 (permalink)
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Right, sorry. Early Tracker which is essentially the Vitara and yeah, my bad, it's SDL protocols through an ALDL connector.
Rhinopower wants 52.00 for their adapter which is essentially a serial-USB FTDI chip and a bunch of other surface mount parts on a custom made PCB. He had the full schematics and parts list up for a while until he realized that people were not buying his adapter then so he took it down. The problem for me is that my main preference here is a serial connection and not USB and SDL has been around long enough that a serial solution MUST exist.
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Old 07-12-2012, 09:36 AM   #4 (permalink)
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Correction - it's SDL protocols and voltage levels through an ALDL connector.

The problem you're going to be faced with is that SDL does not use a standard RS232 baud rate - off the top of my head it's 7812 or 15625 bps - which the UART chips on most serial ports can't do.

Personally I run Rhinoview with a commercially available USB interface (J1962 - OBD II connector) which is more expensive than the Rhinopower one (I bought it before Rhinoman started offering his version) and there's no guarantee of compatability - the supplier actually refused to sell it to me until I agreed that he would not be held responsible if it didn't do what I wanted.

Here's how I see it - you can hunt down the different circuits and try your hand at building them, it's an investment in time & money with no guarantees, and there is the risk, as you have already discovered, of damage to your ECU - or you can buy the tried & tested, professionally designed Rhinoview interface and know that it will work - your choice.
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Old 07-14-2012, 05:42 PM   #5 (permalink)
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Right, so no serial solution exists apparently then. That's kind of dumb if the only proven solution is to pay through the nose for a lousy adapter.
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Old 07-14-2012, 08:40 PM   #6 (permalink)
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You don't need an interface or Rhinoview to diagnose a problem with the vehicle, you can insert a jumper (or diagnostic fuse), count the flashes and look up the codes - what you need to do, and how you go about doing it are documented in the FSM for your vehicle.

Apparently you're looking for more - as I was - how about you design your own hardware interface, sit down & reverse engineer the communication protocols, and then write your own application?

Do you think you have what it takes?

Would you like to price a Tech1 or a Tech2 with the necessary adapter & cartridge, see what that'll set you back?

Rhinoman has put a lot of time & hard work into reverse engineering the SDL protocols, he doesn't have to make that available to you, he's designed an interface that works, and made that available also, and given the fact that he's made it available for less than I paid for the interface I have, I'm going to guess that he's not doing it at a profit.
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Old 07-15-2012, 09:23 AM   #7 (permalink)
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Quote:
Originally Posted by MIPS View Post
there's the USB-only adapter Rhinopower themselves sell for way too much.
The interface is priced similar to other interfaces of this type. The price of the interface has to cover business overheads as well as the cost of the components themselves. As well as the usual everyday business expenses such as corporation tax, income tax, bank charges and national insurance taxes Rhinopower has purchased over forty ECUs which are used for product testing and have recently invested over $1000 on the complete SDL database which will mean that we can offer our customers a product comparable to a factory tool at a fraction of the price.
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Old 07-15-2012, 11:23 AM   #8 (permalink)
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Well this got kind of awkward.
I won't complain then.
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Old 09-08-2012, 09:22 AM   #9 (permalink)
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Default diagnostic interface for old wagon R (MJ98)

Hallo "fordem",

on the 7th July you wrote to MIPS, his SDL is using 7812 or 15625 bps.

In the "Suzuki Aftermarket Application" for the Vetronix Tester I found on Page 80, that an IF for the SDL is working, using standard UART with 10.4k baud rate.

Can you tell me more about the baud rate, protocoll and the bit-coding for the old wagon R?

Thanks

Mic
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Old 09-08-2012, 12:55 PM   #10 (permalink)
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The original Suzuki diagnostic interface used baud rates of 7812 and 15625 baud, these were used up to in North America and elsewhere up to around 2001. This interface used pin 9 on the J1962 (OBD2) connector.
After that there were two different Suzuki protocols that used the 10400 baud rate, both of these used pin 7 on the J1962 connector.
ECUs used by The OBD2 Suzukis sold in the US between 1996 and around 2003 had a Suzuki proprietary protocol that used the same ISO 9141-2 interface that they used for OBD2, this was known as SDLJ1979.
From around 2001 onwards in markets that weren't OBD2 or EOBD there was a Suzuki proprietary protocol similar to KWP2000 called SDLKWP.

As far as the WagonR is concerned I have had ECUS for the K10 and K12 engine from 1998/1999 and both of these used the original SDL protocol at 7812 baud. You need to be more specific about your vehicle.
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