Specifications

Electronics 8
5975 Series MSD Troubleshooting and Maintenance Manual 223
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
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 5V) 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.
