176 Troubleshooting and Maintenance Manual
8 Electronics
Bus board
This board is mounted on the bottom of the electronics module. It acts as a bus
connecting the two main boards.
PLX card
This card, located inside the SmartCard module, provides fast
communications between the processor module and other parts of the MS
system. It speeds up the entire system by removing communications tasks
from the central processor.
LAN/MS Control Card (Smartcard 4)
The LAN/MS control card is located to the left of Main Boards 1 and 2 on the
electronics panel. The LAN/MS control card has two main functions:
• Provide a communication interface between the MS and the data system
• Provide real-time control of the MS, 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
LEDs on the LAN/MS control card are visible near the LAN connector on the
rear panel.
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