Looks like I will have a flashable smec soon and now I can't find the info for the serial interface and cable.
Does anybody have links? Derek posted a part number for the diag. port connector and d-cal has a schematic for what leads do what... But I am trying to find a write up.
If anybody can help or wants to make if for met, let me know
Thanks,
-Gary Mazzone-
1986 GLHS #168
You will need to have a TTL to RS232 voltage level convertor. This is because the voltage level at the ECU is TTL aka 5volts. The RS232 serial port on the computer is over 12volts. There are several different methods of converting, however the best uses a MAX232 chip. That is the part number he probably listed?
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Ok, that is what I kind of thought. I just can't find the write ups on making the converter.
The connector part numbers are just for the diag port connector,
summit part number: 20130
OTC number: 212635
-Gary Mazzone-
1986 GLHS #168
oh, could you post the wire diagram for attaching the serial converter to the smec?
Sure, see attachment
That board you listed looks like it does what's needed, but I am not sure I see where the diagnostic port wires would be attached... I see the serial connection(obviously)...
-Gary Mazzone-
1986 GLHS #168
GND goes to the pad just below the crystal
+5V goes to the edge side of resistor R103 (right next to the pad)
RD (receive) goes to pin 12 of Z20 (CPU)
TD (transmit) goes to pin 11 of Z20 (CPU)
Does this help? I don't actually have the board so I can't give you the exacts.
Nevermind, I found this picture. Credit goes to Geoff Allan for pic and info.
Ah right, not sure how I missed that. ThanksLooks like I can build my own now
-Gary Mazzone-
1986 GLHS #168
that picture looks like the wiring from an LM caught fire on the couch? How does that help?
I think it was the directions given along with the pic that really helped.Originally Posted by GLHNSLHT2
Yeah that shows where the wires enter the converter. Much help
-Gary Mazzone-
1986 GLHS #168
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