LYCOS RETRIEVER 
Serial: Connectors
built 266 days ago
The Serial ATA cabling is thin and flexible and resembles USB or FireWire connectors and cabling. Additionally, Serial ATA storage devices can be hot-plugged just like USB and FireWire devices. Understandably, there is speculation that Serial ATA will ... someday be used as an external connection like USB and FireWire.
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The data link connector (DLC) allows a scan tool to communicate with the class 2 serial data line. The serial data line is the means by which the microprocessor-controlled modules in the vehicle communicate with each other. Once the scan tool is connected to the class 2 serial data line through the DLC, the scan tool can be used to monitor each module for diagnostic purposes and to check for diagnostic trouble codes (DTCs). Class 2 serial data is transmitted on a single wire at an average of 10.4 Kbps (10,400 bits per second). This value is an average, class 2 uses a variable pulse width modulation to carry data and, depending on the message, it may operate faster or slower. The bus is active at 7.0 volts nominal and inactive at ground potential.
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To create a serial connector you could simply use an existing remote cable (although note that the serial RxD line is not connected on the standard Apple cable). Alternatively you could use one of the following techniques.
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