Download Diacom Driver

26-03-2021

Download Diacom Driver

This document describes the Diacom hardware and software package.Tech Edge has no affiliation with the Diacom manufacturer and neither supports nor endorsesthe product. All information and link(s) presented here are believed to be in the publicdomain. We welcome further information regarding this package.

Note that if you need a scan tool then you can build your own quite cheaply,and use our own free software (see last paragraph below).

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What is DIACOM?

The DIACOM product is a combination of software and hardware produced byRinda Technologies of 563 N. Elston Ave. Chicago, IL 60630, USA.

DIACOM stands for Diagnostic Interface for Automotive Computers.

Diacom displays diagnostic information, available from a vehicle's ECU, on a PC screen.This process is shown in the diagram and highlights that the Diacom hardware connects to both thevehicles ALDL connector and the PC's parallel port. The Diacom software is controlled from the keyboardand displays results on the PC's screen. Not shown is Diacom software's ability to saveand load information to and from disk.

Rinda's information on Diacom lets you downloada demo. But, as you'll see, it's really an advertisement, but does show Diacom's user interface.Diacom's strength lies not in its relatively unsophisticated software and its very simple hardware,but in the database of vehicles that Rinda maintains and that Diacom therefore supports.

For many early ECUs, Diacom can only tell you very basic information about your vehicle,because that's all that's available from the ECM.For example, the Australian Holden VN Commodore uses a GM P4 series ECU(type number 1227808)and this ECU outputs just twenty (20) bytes of data. But that 20 bytes can be used to diagnosequite a number of faults present in the ECU itself, within a vehicle sensor, or with the vehicle's wiring.For an experienced mechanic using a 'swap and retest' methodology, this can be enough extra informationto enable accurate and speedy fault identification.

The problem, for the average weekend handyman, is that Diacom is not a cheap product to purchase.

Diacom Hardware

The following schematic is a functional equivalent of the Rinda supplied ALDL hardware.On the left it shows connections to the PC's parallel port.On the right is shown the connections to the ALDL connector.

The three transistors in the middle and to the right control the ALDL mode selected.The two transistors on the bottom right read 160 baud ALDL and other data.The transistor at the top and the middle leftmost are for reading (and writing) 8192 baud data streams.The bottom leftmost transistor enables the other transistors above it.

Diacom Prototype

I have made up this circuit and can verify that it works ona Holden VN Commodore with software supplied by Rinda.Rather than use 2670 ohm resistors, I used 2.7k (also called 2k7) ohm resistors,and I also used BC547 transistors rather than the ones suggested(these are garden variety NPN transistors).

This is a picture of my one-off unit. The wires on the bottom go off to whatever ALDLconnector you require for your vehicle (ie. the Car ALDL connector in the schematic).

The photo also shows a red LED, on the left, to indicate power(connect to pin H for some vehicles)and a green LED for ALDL data (connect to pin D or E depending on vehicle).These were added as a diagnostic aid and connect to the points above and GND,with a series 3k3 current limiting resistor.

Unfortunately, we can't answer any questions about how to buildthis circuit as this information is intended to enable you to fixan existing cable that was originally purchased from Rinda.But you can make your own 160or 8192baud interface.