Printed Circuit Boards (PCBs) TriStar II 3020Service
2-10 Jul 09
The card cage is the main assembly of electrical systems and the connection between those
systems and other components inside and outside of the instrument. The card cage is
comprised of three boards: Backplane, CPU, and Digital Interface PCBs.
DSP-ISA CPU
The DSP-ISA CPU PCB provides control of the instrument. Application software is loaded
into this PCB. This board is in the first slot from right to left.
Digital Interface
The digital interface board generates control signals for valve drivers and the elevator
interface. This board also stores all PCB IDs, and instrument calibration information. Finally,
it has the necessary RS-232 channels for serial communications and connections for ethernet.
The digital interface board is in the second slot from right to left.
Backplane
The backplane carries the necessary signals and DC power to and from the boards in the card
cage.
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