Browse Prior Art Database

Diagnostic Testing of Assembly Line Data Link Cable

IP.com Disclosure Number: IPCOM000038685D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Ballou, RV: AUTHOR [+7]

Abstract

This article describes a technique to test quickly and accurately the assembly line data link (ALDL) cable which connects a diagnostic technician terminal to a vehicle. The ALDL cable is used to connect the diagnostic technician terminal to the vehicle. It plugs into a connector that ties the terminal to the serial data link that interconnects the vehicle on-board computers. This allows the terminal to receive data from the on-board computers to determine the state of actuators, switches, valves, etc., and the values read from various sensors. This information is used by the terminal to diagnose vehicle problems. If the cable has been damaged or the circuits supporting it are faulty, an erroneous diagnosis might be made resulting in an incorrect repair action.

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Diagnostic Testing of Assembly Line Data Link Cable

This article describes a technique to test quickly and accurately the assembly line data link (ALDL) cable which connects a diagnostic technician terminal to a vehicle. The ALDL cable is used to connect the diagnostic technician terminal to the vehicle. It plugs into a connector that ties the terminal to the serial data link that interconnects the vehicle on-board computers. This allows the terminal to receive data from the on-board computers to determine the state of actuators, switches, valves, etc., and the values read from various sensors. This information is used by the terminal to diagnose vehicle problems. If the cable has been damaged or the circuits supporting it are faulty, an erroneous diagnosis might be made resulting in an incorrect repair action. The technique disclosed herein defines a way to test quickly and accurately the cable and its supporting electronics. The drawing shows the ALDL control attachment in block diagram. A connector is provided in the terminal into which the ALDL cable is "parked" when not in use or whenever the technician wants to verify it. The ALDL cable K contains multiple send and receive wires but only two, I and J, are shown. The connector shorts together all the drivers and receivers in the cable so that they may be verified by a software test routine which is part of the microcode of the attachment. This test routine can be invoked by a technician by selecting an option on a display...