ALDL interface circuit

GONZO · Post by **GONZO** » Tue Jul 14, 2009 8:11 am

Here is a link to an interface for the RS232, I have used this circuit with and without the regelator. Just need to use the +5V from the ECM. Just make sure you use electrolytic caps. Hope this doesnt make it too easy an exercise for anyone to make a hi speed comms ECM

http://www.techedge.com.au/vehicle/aldl8192/8192hw.htm

Post by **Holden202T** » Tue Jul 14, 2009 11:10 am

GONZO wrote:Just make sure you use electrolytic caps.

why is that ?

GONZO · Post by **GONZO** » Wed Jul 15, 2009 8:21 am

Dunno, just didnt work.

(Hope the explanation wasn't too complicated.)

Post by **delcowizzid** » Wed Jul 15, 2009 11:30 am

the techedge schematic has an error or 2 as well the diode is round the wrong way for a start if i remember right

Post by **antus** » Wed Jul 15, 2009 11:52 am

the techedge is for an ALDL interface (half duplex, with echo). this mod provides RS232 serial (no echo) at 8192 baud. Most software is fine with it if you find the "echo?" option and disable it.

djbrooksy · Post by **djbrooksy** » Thu Jul 16, 2009 1:44 am

delcowizzid wrote:the techedge schematic has an error or 2 as well the diode is round the wrong way for a start if i remember right

has it been fixed if not what needs to be changed
or is there a better diagram to work from

Post by **delcowizzid** » Thu Jul 16, 2009 5:34 am

put the diode round the other way and it should work fine for aldl

Post by **Holden202T** » Thu Jul 16, 2009 5:49 am

heres the techedge one .... some years ago i emailed Peter and asked if i could display this on my site and also if he would mind if i slightly edited it.

main difference is that it gets +12v from the car rather than from the serial port (seems to be more stable this way and its in the aldl plug from factory!)

also the diode has been reversed as antus mentioned.

djbrooksy · Post by **djbrooksy** » Thu Jul 16, 2009 1:09 pm

HI
sorry to hijack the thread but is it ok to use
non polarised caps

Post by **delcowizzid** » Thu Jul 16, 2009 1:37 pm

the data sheet says polarised either tatinums or electrolytics will do.or use the other version i think its the 233 that doesnt need external caps they are built in check the datasheets they will tell you

ALDL interface circuit

ALDL interface circuit

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