IBM 7012 G Series Service Manual page 21

RS-485 Card
The RS-485 card is installed in the rear of both the base and the disk expansion units.
It is provided with a variety of connectors, whose functions are explained in the following
figures.
Power Connector
(Coming From the Power Supply
RS-485
RS-485 Out
1-8
Service Guide
INTERNAL VIEW
EXTERNAL VIEW (BASE UNIT)
Mouse Keyboard
EXTERNAL VIEW (DISK EXPANSION UNIT)
Not Used RS-485 In
Power/Signal Connector
(Coming From the Operator Panel)
External Fan
External Fan