2-1
SECTION 2
FUNCTIONAL DESCRIPTION
This section provides a detailed functional description along with interconnection diagrams and
descriptions of the Hologic QDR 4500. Refer to Section 1 for a block diagram and a brief
functional description of each block.
COMPUTER
The QDR 4500 Scanner interfaces to an ISA Bus computer to control table and C-arm movement
and X-ray generation, perform all necessary calculations, and manage patient and QC database
information.
The computer is a Pentium-based (or higher) PC compatible that comes equipped with 3.5-inch
floppy disk and hard disk drives, keyboard, color monitor, and an optional Iomega 1GB JAZ
drive. For details pertaining to the computer and its associated components, please refer to the
documentation shipped with each unit.
COMMUNICATIONS CONTROLLER BOARD
The Communications Controller board handles all the communications between the Computer
and the Scanner’s C-Arm and Table assemblies. The board resides in one of the computer
internal slots and interfaces with the computer via the computer's I/O bus. It connects to the
Scanner’s Distribution board through a 50 conductor ribbon cable. This cable contains two
independent communications links (one asynchronous and one synchronous) and additional
system control signals. Each signal requires a pair of conductors for differential (RS422) noise
immunity.
The asynchronous communications link communicates with the Motor Controller boards (TX,
TY, AY and AR), the TZ Drive board, the C-Arm Interface board, and the Control Panel
Controller board. The synchronous communications link communicates with the Data
Acquisition System (DAS).
Interface Connections
Table 2-1 describes the interconnections between the Communications Controller board and the
Distribution board. The table also identifies the interconnection connector and pin assignments.
Figure 2-1 shows the interconnections between the Communications Controller board and the
Distribution board.
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