Diacom cable for GM

[John Hess]

Actually, the 12 volts (per the documentation) is only necessary if the
unit does not power itself properly off the Parallel (Not RS-232) port.
I think I have the schematic of the interface;  but, haven't had the
time to breadboard it, yet!


> ----------
> From: 	sfg[SMTP:sfgent at ac.net]
> Sent: 	Monday, October 13, 1997 9:02 AM
> To: 	diy_efi at coulomb.eng.ohio-state.edu
> Subject: 	Diacom cable for GM
> 
> I purchased the Diacom diagnostic interface (GM) kit back in '92. It
> runs under DOS and has been worth the $200 or so I spent on it.
> The supplied cable, which connects your RS232 to the ECU (ALDL) has a
> red wire for 12VDC input. Recently I discovered the system works with,
> or without the 12VDC connected. I had always assumed there were active
> components molded into one of the connectors; now I am wondering if
> its
> really just a hunk of wire, with connectors on each end. Anyone know?
> Steve
>