HP Book 800CT manual Loop Back Connectors, Serial Loop Back Connector

Loop Back Connectors

In order to run the RS232 serial port, parallel port, and SCSI port self-test, a loop back connector is needed. The loop back may be placed on either the OmniBook port or at the end of the corresponding cable. This feature is also helpful in diagnosing a defective serial, parallel, or SCSI cable.

Loop back connectors may be purchased or can easily be constructed. The following illustrations identify the correct pin-out configurations for the serial, parallel, and scsi loop back connectors.

Figure 5 - Serial Loop Back Connector

Figure 6 - Parallel Loop Back Connector

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Figure 7 - SCSI Loop Back Connector