BenQ 2720S Service Guide - Page 27

SCSI Interface

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interfacing between scanner and HOST computer. The single-chip microprocessor, W78E516 fetches its programs from the ROM embedded in itself. It is dedicated to control the startup/initialization, and self test. To scan an image, the host computer sends a series of SCSI commands to set and get scanning parameters. Then, the host will send SCAN command to inform it to prepare for scanning. After SCAN command completes, the host will send several READ commands to receive scanned data from it. During preparing and scanning, it will accelerate, move and decelerate the line motor. Also the Fluorescent lamp will be turned off if defined time-out has reached before the 2740S scanner system receives any command since last command. The SCSI interface is built in ASIC AP2106A. It handles the handshaking, software protocols, and interfacing SCSI bus. The communication between 2740S scanner and host computer, for both PC and Mac, is achieved via SCSI interface. 5.2 SCSI Interface The 2740S scanner SCSI protocol is built in ASIC AP2106A as its SCSI interface. It is designed to meet the SCSI protocols and allow to direct connection the SCSI bus.This section describes the SCSI Interface. The SCSI ("Small Computer System Interface") is an 8-bit, parallel cable interface, with handshakes and protocols for handling multiple hosts and multiple . 5.3.1 SCSI Interface The SCSI interface is composed of the following items: a host SCSI adapter card(ACARD 6710-D, for PC version only), SCSI Cable(shield), and AP2106A(built in SCSI interface).The illustration is shown in figure 5-5. Electrical Systems API Confidential 5-5 No Copy/Reproduction allowed

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interfacing between scanner and HOST computer.
The single-chip microprocessor, W78E516 fetches its programs from the
ROM embedded in itself. It is dedicated to control the startup/initialization,
and self test. To scan an image, the host computer sends a series of
SCSI commands to set and get scanning parameters. Then, the host will
send SCAN command to inform it to prepare for scanning. After SCAN
command completes, the host will send several READ commands to
receive scanned data from it. During preparing and scanning, it will
accelerate, move and decelerate the line motor. Also the Fluorescent lamp
will be turned off if defined time-out has reached before the 2740S
scanner system receives any command since last command.
The SCSI interface is built in ASIC AP2106A. It handles the handshaking,
software protocols, and interfacing SCSI bus. The communication
between 2740S scanner and host computer, for both PC and Mac, is
achieved via SCSI interface.
5.2 SCSI Interface
The 2740S scanner SCSI protocol is built in ASIC AP2106A as its SCSI
interface. It is designed to meet the SCSI protocols and allow to direct
connection the SCSI bus.This section describes the SCSI Interface. The
SCSI ("
S
mall
C
omputer
S
ystem
I
nterface") is an 8-bit, parallel cable
interface, with handshakes and protocols for handling multiple hosts and
multiple .
5.3.1 SCSI Interface
The SCSI interface is composed of the following items: a host SCSI
adapter card(ACARD 6710-D, for PC version only), SCSI Cable(shield),
and AP2106A(built in SCSI interface).The illustration is shown in figure
5-5.
Electrical Systems
API Confidential
5-5
No Copy/Reproduction allowed