![]() ![]() 1986: General Motors introduces an upgraded version of the ALDL protocol, which communicates at 8192 baud with half-duplex UART signaling on some models.1982: RCA defines an analog STE/ICE vehicle diagnostic standard used in the CUCV, M60 tank and other military vehicles of the era for the US Army.The specification for this link is as defined by GM's Emissions Control System Project Center document XDE-5024B. It reports real-time sensor data, component overrides, and Diagnostic Trouble Codes. The protocol communicates at 160 baud with Pulse-width modulation (PWM) signaling and monitors all engine management functions. ![]() Included in this system is a proprietary 5-pin ALDL that interfaces with the Engine Control Module (ECM) to initiate a diagnostic request and provide a serial data stream.
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