Lcd Board (Msmt344) - Intergraph InterServe 800 System Reference Manual

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LCD Board (MSMT344)

The LCD board consists of a four-line display screen, soft-touch buttons, and status LEDs
that allow you to monitor the chassis (and the disk section, if RAID). The screen reports
various status and events in a software-independent manner. The InterServe 800 power
supplies feature a +5V output -- which is always on -- to report the system status even if the
system is powered off.
The LCD board functions as a central resource through which system power and status
signals are routed. The system monitor accepts status inputs from the dual 550 Watt power
supplies, internal RAID disk section, temperature sensors, safety interlocks, and fans, and
generates the appropriate alarms and alerts.
NOTE If the microcontroller of the LCD board fails, it will not issue a command to the power
supplies to turn-on when the keyswitch is moved to the on (|) position. The LCD board will
not display any text on the LCD screen, and should be replaced.
The following diagram illustrates the routing of signals used to collect and report status
through the microcontroller.
Power Supply
Status
ID PROMs
Voltage
Sensors
Microcontroller (System
Monitor Firmware)
2
I C Bus
CPU/RAID
Select
Data MUX
LCD Screen
Internal RAID
Interface
FPGA
Status LEDs
ISM Interface
Menu Buttons
Fan RPM Sensor
Hot-Swap Only