222 5977B Series MSD Troubleshooting and Maintenance Manual
8 Electronics
High vacuum gauge connector
This powers the high vacuum gauge and connects its signal to the controlling
electronics.
SERIAL A
This RS-232 connector is not currently used.
CI COMM
This RS-232 connector goes to the CI flow module if it is installed on the MSD.
It handles data communication between the GC and the MSD.
LAN
The LAN cable from the data system is connected to this LAN connector. This
cable carries all data communication between the PC and the MSD.
LAN/MSD control card LEDs
The two upper LEDs indicate network communication. The two bottom LEDs
are the power and the heartbeat indicator.
GC COMM
This RS-232 cable connector is used for LVDS communication with a
supported GC.
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