Electronics 8
5977B Series MSD Troubleshooting and Maintenance Manual 219
LAN/MS Control Card
The LAN/MS control card is located to the left of the main board on the
electronics panel. The LAN/MS control card has two main functions:
• Providing a communication interface between the MSD and the data system
• Providing real-time control of the MSD, freeing the data system for other
tasks
Functional areas of the LAN/MS control card include:
• Instrument controller
• Data processor
• Main processor
• Serial communication processor
• Network communication controller
• Remote start processor
• Random access memory (RAM)
• Status LEDs
• Local Control panel firmware
• Mini display module
LEDs on the LAN/MS control card are visible on the rear panel. The upper two
LEDs indicate network communication.
The two bottom LEDs are the power (On, digital 5 V) and the heartbeat
indicator. The flashing heartbeat LED indicates that the operating system of
the MSD is functioning. In case of catastrophic loss of flash memory, the
heartbeat flashes in an SOS (•••– – – •••) pattern.
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