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1、 AIIM PIS58 9 C r U 1032348 0500786 TO8 ASSOCIATION FOR INFORMATION 11 O0 Wayne Avenue Suite 11 O0 Maryland 20910 AlIM MANAGEMENT 301 -587-8202 INTERNATIONAL COPYRIGHT Association for Information Z A7 A a A I 2 A SEATING PLANE Pin X Pin Y Pin Z Dimensions 25 34 26 35 so 68 A l A2 A3 A4 A5 A6 A7 A8 A
2、S 0.23 0,009 . 0.23 0,009 AIO 0,6of0,03 O,024iO,O01 0,6O,O3 0,024I0,OOl AI7 I 0.23 I 0.009 I 0.23 I . 0.009 Figure 6 - 50/68-contact shielded high-density cable connector (This figure corresponds to figure 6 in ANSI X3.131.) 10 Association for Information and Image Management International COPYRIGHT
3、 Association for Information R2 = 124R, 1%; R3-R20= 100S2, 2%. The voltage regulator shown i s an adjustable shall be 1,25 V or -DB(P) -ATN -BSY -ACK -RST -MSC -SEL -C/D -REQ - I/O R20 Figure 9 - Termination for singe-ended devices (This figure corresponds to figure 10 in ANSI X3.131.) 17 Associatio
4、n for Information and Image Management International COPYRIGHT Association for Information the other seven data bits shall be released (i.e., not driven) by this SCSI device. The parity bit B(P) may be released or driven to the true state, but shall never be driven to the false state during this pha
5、se. The signal shall be driven by the initiator, target, or both, as specified in the SELECTION phase and RESE- LECTION phase. If driven, this signal shall be driven only by the active initiator. The signai shall be released; that is, not be driven by any SCSI device. The bias circuitry of the bus t
6、ermina- tors pulls the signal to the false state. The signal shall be driven by the one SCSI device that wins arbitration. If the signal is driven, it shall be driven only by the active target. I see ANSI X3.131 6.1.3.1 and 6.1.4.2 for a complete description. 4.7.17 Selection time-out delay The mini
7、mum time that a SCSI device should wait for a BSY response during the SELECTION or RESELECTION phase before starting the time-out procedure. Note that this is only a recommended time period. 4.7.18 Transfer period The minimum time allowed between the leading edges of successive REQ pulses and of suc
8、cessive ACK pulses while using synchro- nous data transfers. (See ANSI X3.13 1, clause 6.1.5.2 and 6.6.21 .) 4.8 Fast synchronous transfer option When devices negotiate a synchronous data transfer period of less than 200 ns they are said to be using “fast synchronous data transfers.” (Devices which
9、negotiate a synchronous data transfer period greater than or equal to 200 ns use timing parameters speci- fied in 4.7.) When a fast synchronous data transfer period is negotiated, those specific times redefined in this section are used; those not redefined remain the same. The minimum synchronous da
10、ta transfer period is 100 ns. 8.8.1 Fast assertion period This value is the mini- mum time that a target shall assert REQ while using fast synchronous data transfers. Also, the minimum time that an initiator shall assert ACK while using fast synchronous data transfers. 4.8.2 Fast cable skew delay Th
11、is value is the maxi- mum difference in propagation time allowed between any two SCSI bus signals measured between any two SCSI devices while using fast synchronous data trans- fers. 4.8.3 Fast deskew delay This value is the minimum time required for deskew of certain signals while using fast synchr
12、onous data transfers. 4.8.4 Fast hold time This value is the minimum time added between the assertion of REQ or ACK and the changing of the data lines to provide hold time in the initiator or target, respectively, while using fast syn- chronous data transfers. 4.8.5 Fast negation period This value i
13、s the mini- mum time that a target shail negate REQ while using fast synchronous data transfers. Also, the minimum time that an initiator shall negate ACK while using fast synchronous data transfers. 5 Scanner devices - This clause corresponds to clause 15 of ANSI X3.13 1. - 5.1 Model for scanner de
14、vices Scanner devices generate a digital representation of two or three dimensional objects (e.g., a page of text, a photograph, or a piece of a r t ) . This is accomplished by sensing the amount of light transmitted from the object and generating the digital data. The digital data can then be sent
15、across the SCSI bus to an initiator for further processing. There are two types of scanners in use; in one type, the operations and functions of the scanner are fixed; in the other type, the operations and functions are pro- grammable and need to be set up prior to being used for scanning objects. T
16、he scanner device generates the data and transfers it in accordance with the commands received from the initiator. The contents of the data is vendor specific, therefore the initiator and the scanner must know how to use the contents of the data. Scanners generate a digital image of an object in a t
17、wo dimensional plane. The x-axis dimension is along the cross-scan direction which is perpendicular to the - 24 Association for Information and Image Management International COPYRIGHT Association for Information the target disconnects until the resource or data is available, and then re-connects to
18、 resume the operation; a BUSY status is returned. b. c. If the scanner device determines that an error or exception condition has occurred while executing the SCSI command from the initiator, a CHECK CONDI- TION status is returned. A REQUEST SENSE com- mand can then be used to determine additional i
19、nformation regarding the error or exception condi- tion. 5.2 Commands for scanner devices The commands for scanner devices shall be as shown in table 6. 25 Association for Information and Image Management International COPYRIGHT Association for Information & Imaging Management Licensed by Informatio
20、n Handling Services COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services AIIM US58 %b 1012348 0500816 575 ANSVAIIM MS58-1996 Implementation of Small Computer Systems Interface (SCSI-2), (X3.131-1994) for Scanners Command name CHANGE DEFINITION COMPARE
21、COPY COPY AND V E m GET DATA BUFFER STATUS GET WINDOW INQUIRY LOG SELECT LOG SENSE MODE SELECT(6) MODE SELECT( 1 O) MODE SENSE(6) MODE SENSE( 10) OBJECT POSITION READ READBUFFER RECEIVE DIAGNOSTIC RESULTS RELEASE UNIT REQUEST SENSE RESERVE UNIT SCAN SET WINDOW SEND SEND DIAGNOSTIC TEST UNIT READY WR
22、ITE BUFFER Operation code 40h 39h 18h 3Ah 34h 25h 12h 4Ch 4Dh 15h 55h 1Ah 5Ah 31h 28h 3Ch 1Ch 17h 03h 16h 1Bh 24h 2Ah 1Dh h 3Bh Key: M = Command implementation is mandatory. O = Command implementation is optional. Wpe O O O O O M M O O O M O M M M O O M M M M M O O M O Subclause 8.2.1 (ANSI X3.131)
23、8.2.2 (ANSI X3.131) 8.2.3 (ANSI X3.13 1) 8.2.4 (ANSI X3.131) 5.2.1 (this document) 5.2.2 (this document) 8.2.5 (ANSI X3.131) 8.2.6 (ANSI X3.131) 8.2.7 (ANSI X3.131) 8.2.8 (ANSI X3.131) 8.2.9 (ANSI X3.131) 8.2.10 (ANSI X3.131) 8.2.11 (ANSI X3.131) 5.2.3 (this document) 5.2.4 (this document) 8.2.12 (A
24、NSI X3.131) 8.2.13 (ANSI X3.131) 10.2.9 (ANSI X3.131) 8.2.14 (ANSI X3.131) 10.2.10 (ANSI X3.131 5.2.5 (this document) 5.2.7 (this document) 5.2.6 (this document) 8.2.15 (ANSI X3.131) 8.2.16 (ANSI X3.131) 8.2.17 (ANSI X3.131) Table 6 - Commands for scanner devices (This table corresponds to table 277
25、 in ANSI X3.131.) All other operation codes for scanner devices are reserved for future standardization. 26 Association for Information and Image Management International COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services COPYRIGHT Association for In
26、formation & Imaging Management Licensed by Information Handling Services AIIM MS58 b U 1012348 050017 401 ANSUAIIM MS58-1996 Implementation of Small Computer Systems Interface (SCSI-2), (X3.13 1-1994) for Scanners 5.2.1 GET DATA BUFFER STATUS command The GET DATA BUFFER STATUS command (table 7) prov
27、ides a means for the initiator to get information about the data buffer. Information is returned only for window identifiers for which a SCAN command has been received (see 5.2.5). Allocation length Table 7 - GET DATA BUFFER STATUS command (This table corresponds to table 278 in ANSI X3.131.) A wait
28、 bit of zero indicates that the target shall respond immediately. A wait bit of one indicates that the target shail wait for image data to be available before returning scan status data. The data buffer status data format is defined in table 8. Data buffer status length Available data buffer Table 8
29、 - Data buffer status format (This table corresponds to table 279 in ANSI X3.131.) The data buffer status length indicates the length in bytes of the following scan status data that is available to be transferred during the DATA IN phase. The data buffer status length does not include itself. The da
30、ta buffer status data transferred to the initiator includes zero or more data buffer status descriptors. Each descriptor returns information for the window specified by the window identifier. The block bit specifies the buffering capabilities of the scanner. A block bit of one indicates that the dat
31、a buffer is full and ail image data must be transferred to the initiator before the scan operation resumes. A block bit of zero indicates that data buffer is not full and scan operations can continue with the available data buffer space. 27 Association for Information and Image Management Internatio
32、nal COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services AIIM MS58 96 3032348 0500838 348 ANSVAIIM MS58-1996 Implementation of Small Computer Systems I
33、nterface (SCSI-2), (X3.131-1994) for Scanners Bit 7 6 5 4 Byte The available data buffer field indicates, in bytes, the amount of buffer available for transfers from the initiator. This field is valid only in scanners with the ability to accept data from an initiator for processing. The filled data
34、buffer field indicates the amount of image data in bytes available for transfer to the initiator. 5.2.2 GET WINDOW Command The GET WINDOW command (table 9) provides a means for the initiator to get informa- tion about previously defined windows. 3 2 1 O O Operation code (25h) 1 Logical unit number R
35、eserved Single Reserved 3 Il Reserved Reserved Window data length (LSB) 5 6 7 8 9 Window identifier Transfer length (MSB) (LSB) Control Bit Byte O 7 6 5 4 3 2 1 O (MSB) Reserved I : Reserved 4 5 6 7 Reserved Reserved Window descriptor length (MSB) (LSW COPYRIGHT Association for Information & Imaging
36、 Management Licensed by Information Handling Services COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services AIIGI NS5A %b 303i2348 050083r 284 - ANSUAIIM MS58-1996 Implementation of Small Computer Systems Interface (SCSI-2), (X3.131-1994) for Scanners B
37、it 7 6 Byte 5 4 3 2 1 O 3 I O 1 X-Axis resolution (LSB) Window identifier Reserved I Auto l3 I 22 23 Y-Axis upper left ( L w Brightness Threshold 14 I (MSB) 25 26 l7 I Image composition Bits per pixel Window width ( L w 29 30 31 32 18 I (MSB) RIF Reserved Padding type (MSB) Bit ordering Compression
38、type (LSB) 21 I Window length (LSB) 24 I Contrast Halftone pattern (LSB) 33 I Compression argument 39 I Reserved 40 n Vendor specific parameter byte(s) Table 11 -Window descriptor bytes (This table corresponds to table 282 in ANSI X3.131.) 29 Association for Information and Image Management Internat
39、ional COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services COPYRIGHT Association for Information & Imaging Management Licensed by Information Handling Services AIIM MSSB 96 LOI12348 oSOOBZ0 TTb = ANSVAIIM MS58-1996 Implementation of Small Computer Syst
40、ems Interface (SCSI-2), (X3.131-1994) for Scanners The window identifier specifies the window defined by the window descriptor. A window is referenced by the window identifier during data transfers and parameter updates. When used with the SET WINDOW command, an automatic (auto) bit of one indicates
41、 that the target is allowed to create sub-windows within the window specified. An auto bit of zero indicates that target is not allowed to create sub-windows. When used with the GET WINDOW command, an auto bit of zero indicates that the window was defined directly by the SET WINDOW command. A value
42、of one indicates that the window was defined by the tar- get. This is a sub-window within a window defined by a SET WINDOW command. The window identifiers assigned by the target shall be unique and not currently in use. The parameters for the sub-windows may be retrieved using the GET WINDOW command
43、. The x-axis resolution field specifies the resolution in the scan line direction. The unit of measure is picture elements (pixels) per inch. A value of zero specifies the default resolution. The y-axis resolution field specifies the resolution in the base line direction. The unit of measure is scan
44、 lines per inch. A value of zero specifies the default resolution. The x-axis upper left field specifies the x-axis coordi- nate of the upper left comer of the window. This coor- dinate is measured from the scan line using the targets current measurement unit divisor (see 5.3.3.1). The y-axis upper
45、left field specifies the y-axis coordi- nate of the upper left comer of the window. This coor- dinate is measured from the base line using the targets current measurement unit divisor (see 5.3.3.1). The window width field specifies the width of win- dow in the scan line direction. The window width i
46、s measured using the targets current measurement unit divisor (see 5.3.3. i). The window length field specifies the length of the window in the base line direction. The window length is measured using the targets current measurement unit divisor (see 5.3.3.1). The brightness field specifies the leve
47、l of brightness used to scan the object. A value of zero specifies the default brightness or automatic brightness control if it is supported. Any other value indicates a relative brightness setting with 255 being the highest setting, 1 being the lowest setting, and 128 being the nominal setting. The
48、 threshold field specifies the threshold at which scan data is converted to binary data. A value of zero specifies the default threshold or automatic threshold control if it is supported. Any other value indicates relative threshold setting with 255 being the highest setting, 1 being the lowest sett
49、ing, and 128 being the nominal setting. The contrast field specifies the level of contrast used to scan the object. A value of zero specifies the default contrast or automatic contrast control if it is supported. Any other value indicates a relative con- trast setting with 255 being the highest setting, 1 being the lowest setting, and 128 being the nominal setting. The image composition field specifies the type of scan operation requested. The image composition is defined as shown in table 12. Code O O h Olh 02h 03h 04h 05h 06h - FF%