Epson ActionScanner II Mac Product Information Guide - Page 4

EPSON ACTIONSCANNER II SCSI Specifications Interface type: ANSI X3.131-1986 standard Function: The following functions are included. BUS FREE phase ARBITRATION phase SELECTION/RESELECTION phase COMMAND phase (Logical Unit Number is fixed to 0 and command link function is not supported.) DATA phase Data in phase Data out phase STATUS phase MESSAGE phase MESSAGE IN phase MESSAGE OUT phase ATTENTION condition RESET condition Electrical standard: As per ANSI X3.131-1986 Signal pin assignments The direction of signals is as viewed from the scanner. Signal GND I/O — NC — DB0 I/O DB1 I/O DB2 I/O DB3 I/O DB4 I/O DB5 I/O DB6 I/O DB7 I/O DBP I/O TERMPWR — ATN I BSY I/O ACK I RST I MSG O SEL I/O C/D O REQ O I/O O Pin No. 50 pin 1−12 14−25 35−37 39−40 42 13 26 27 28 29 30 31 32 33 34 38 41 43 44 45 46 47 48 49 50 25 pin 7,9 14 16 18 24 — 8 21 22 10 23 11 12 13 20 25 17 6 5 4 2 19 15 1 3 Description Ground Not connected Data bus 0 Data bus 1 Data bus 2 Data bus 3 Data bus 4 Data bus 5 Data bus 6 Data bus 7 Data bus parity Termination power Attention Busy Acknowledge Reset Message Select Control/Data Request Input/Output ID Setting: Selectable from 0 to 7 with the rotary switch. Connector type: 25/50-pin connectors Connector pin arrangement: 50 pin Initialization The scanner can be initialized (returned to a fixed set of conditions) in the following ways. Hardware initialization: t When the power is turned on. t When the scanner receives an INIT signal at the parallel interface (pin 31 goes low). 25 1 t When the scanner receives a SCSI Reset signal at the SCSI interface. t When you push the RESET button. 50 25 pin Software initialization: 26 t When the software command ESC @ (initialize the scanner) is received. t When the SCSI Bus Device Message is received. 13 1 25 14 ActionScanner II-4 10/95 Scanners