Silicon Graphics 2400, Owner'S Manual

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Chapter 7: Using the System Controller
The MSC provides environmental monitoring for safe operation of the deskside system.
The MSC connects to the system midplane via a transition or “bridge” board and
provides easy user access to switches and displays at the front of the deskside system.
In the lower right section on the back of the deskside system is a DB-9 alternate console
diagnostic port serial connector that is a direct mirror of the 8-pin diagnostic connector
on the front panel. Figure 7-10 shows the location and pinouts of the 9-pin rear-mounted
MSC diagnostic connector.
Note: You may not connect serial devices to both the front MSC diagnostic port and rear
MSC diagnostic serial connector at the same time. The connectors are wired through the
same circuitry and cannot accept or send signals through both ports at the same time.