ALDL to USB Pinout??
12-04-2014, 08:37 PM
#2
Burning Brakes
You need an adapter to connect to usb. You cant just plug the ALDL port into a usb cable and call it good. Moates has an adapter, but you would still need the software.
12-04-2014, 09:15 PM
#3
Drifting
Thread Starter
Been doing some searching and it seems like home-made USB is a no-go (everyone here probably knows that). Seems like the choices are:
Moates - $80 (probably plus shipping)
ALDLcable - $67 delivered
RedDevilRiver - $55 delivered
I've read MrWillys thread. Has anyone had a RedDevilRiver cable actually work??
Moates - $80 (probably plus shipping)
ALDLcable - $67 delivered
RedDevilRiver - $55 delivered
I've read MrWillys thread. Has anyone had a RedDevilRiver cable actually work??
12-05-2014, 12:23 AM
#4
Race Director
The Red Devil River cables don't work on Corvettes. They work on cars that take a 10K resistor across pins A & B and then put out the data on pin M. Corvettes don't work that way.
The USB to OBD cables have a programmed chip inside them that converts USB to serial data. The chips are actually PIC microcontrollers that are programmed to do the conversion. The chips are made by FTDI and the guy who came up with this is making a zillion dollars, a just reward for a great idea that was executed very well.
The USB to OBD cables have a programmed chip inside them that converts USB to serial data. The chips are actually PIC microcontrollers that are programmed to do the conversion. The chips are made by FTDI and the guy who came up with this is making a zillion dollars, a just reward for a great idea that was executed very well.
12-05-2014, 02:39 PM
#5
Burning Brakes
The moates adapter is $50 for just the adapter or $80 for the adapter, and the cable that plugs in to the OBD connector. The adapter also has a switch for 10k ohms or open.
12-05-2014, 04:24 PM
#6
Drifting
Thread Starter
Does a 1988 Corvette with MAF use the 160 baud with 10k resistor cable?
Not defending RDR, just trying to figure this out. Their 12 pin cable supposedly has the resistor which can be switched in or out. Their web page also says it uses both the 8192 Baud Pin M and 160 Baud Pin E. Or is the problem that if you switch the resistor on it only uses the 8192 pin M?
So for Moates don't you need both the adapter and cable?
I'm guessing ALDLcable and RDR have the FTDI adapter built into the cable where Moates has it in an external box? Or do you need to use the Moates adapter with any of these cables?
Anyone had problems with the ALDLcable version?
Thanks
Not defending RDR, just trying to figure this out. Their 12 pin cable supposedly has the resistor which can be switched in or out. Their web page also says it uses both the 8192 Baud Pin M and 160 Baud Pin E. Or is the problem that if you switch the resistor on it only uses the 8192 pin M?
So for Moates don't you need both the adapter and cable?
I'm guessing ALDLcable and RDR have the FTDI adapter built into the cable where Moates has it in an external box? Or do you need to use the Moates adapter with any of these cables?
Anyone had problems with the ALDLcable version?
Thanks
12-05-2014, 07:54 PM
#7
Burning Brakes
I have the moates adapter. It uses a standard A-B USB cable for the PC. For the car the cables you can buy for it use a RJ45 connector with a custom pinout that you can find on their site. I added a RJ45 jack next to the OBD connector so I could use a common ethernet cable.
12-06-2014, 02:02 AM
#8
Race Director
Not defending RDR, just trying to figure this out. Their 12 pin cable supposedly has the resistor which can be switched in or out. Their web page also says it uses both the 8192 Baud Pin M and 160 Baud Pin E. Or is the problem that if you switch the resistor on it only uses the 8192 pin M?
The Corvette ALDL expects to deliver data on pin E. I'm pretty sure all the earlier ECMs (starting in 1986, but I don't know how late this is true) work this way: They broadcast data continuously at 160 baud on pin E. When they see the correct handshake from the scanner (handheld or software), they switch to 8192 baud, also on pin E. If the scanner can't handle the handshake and the switch to 8192 baud on pin E then they won't work on a Corvette.
12-08-2014, 04:11 PM
#9
Drifting
Thread Starter
Looks my old laptop is equipped with a serial connector so I'll try putting together a serial cable.
I'll try the single transistor version first.
I'll try the single transistor version first.
12-08-2014, 07:13 PM
#10
Racer
Member Since: Apr 2003
Location: Detroit MI
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You can make a DIY USB cable if your into doing that kind of electronics.
Look into the FTDI parts they make one that is USB to TTL pigtail. Then make the voltage shifting interface to handle the TTL to ALDL shift.
Lastly you have to make a ALDL Connector or buy one.
After all this your probably into it for more than you can buy it.
Probably why your not finding much information on a DIY unit.
Look into the FTDI parts they make one that is USB to TTL pigtail. Then make the voltage shifting interface to handle the TTL to ALDL shift.
Lastly you have to make a ALDL Connector or buy one.
After all this your probably into it for more than you can buy it.
Probably why your not finding much information on a DIY unit.
12-12-2014, 02:58 PM
#11
Drifting
Thread Starter
Put together the single transistor serial cable and tried it with WinALDL. Didn't work.
Tried it with the 10k resistor ..... SUCCESS!
Now I have to learn what I'm looking at.
Unfortunately the sensor data looks correct (tps readout seems slow, guess thats what you get at 160 baud).
Tried it with the 10k resistor ..... SUCCESS!
Now I have to learn what I'm looking at.
Unfortunately the sensor data looks correct (tps readout seems slow, guess thats what you get at 160 baud).
Last edited by Rx7Rob; 12-12-2014 at 03:04 PM.
12-13-2014, 03:16 AM
#12
Race Director
160 baud is 16 bytes per second. The data stream is 25 bytes long, so it takes about 1-1/2 seconds to transmit the full set of data. That means that what you are looking at gets updated every 1-1/2 seconds.