Epson GT-30000 Series, Service Manual

Page: 16 / 93

A3 Size Color Flat Bed Scanner GT-30000 Revision A
PRODUCT OUTLINE Interface Specifications 16
1.3.2.8 Status
The status is determined as follows.
Note: R = reserved
1.3.2.9 Display Messages
1.3.2.10 Connector pin arrangement
" Normal SCSI (50pin)
Figure 1-3. Normal SCSI (50pin)
connector pin arrangement
Table 1-5. Status Conditions
Status bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
Good R R 0 0 0 0 0 R
Check condition R R 0 0 0 0 1 R
Busy R R 0 0 1 0 0 R
Table 1-6. Message Summary
Code Message Direction
Negate ATN
before last ACK
00h Command complete In -
01h (Extended Messages)
02h Save Data Pointer In -
03h Restore Pointer In -
04h Disconnect In -
05h Initiator Detected Error Out Yes
06h Abort Out Yes
07h Message Rejection In/Out Yes
08h No Operation Out Yes
09h Message Parity Error Out Yes
0ch Bus Device Reset Out Yes
80h-ffh Identify In/Out No
In = Target to Initiator, Out = Initiator to Target
Yes = Initiator shall negate ATN before last ACK of message
No = Initiator may or may not negate ATN before last ACK of message
Table 1-7. Extended Message
Code
Message
length
Byte
Extended Message Name Direction
Completion
of ATN
01h 5
Synchronous Data Transfer
Request
IN/out Yes (out)
03h 4 Write Data Transfer Request IN/out Yes (out)
Table 1-8. Normal SCSI Connector Functions
Signal In/Out Connector pin No Description
GND 1~12, 14~25, 35~37, 39, 40, 42
NC 13
DB0 I/O 26 Data Bus 0
DB1 I/O 27 Data Bus 1
DB2 I/O 28 Data Bus 2
DB3 I/O 29 Data Bus 3
DB4 I/O 30 Data Bus 4
DB5 I/O 31 Data Bus 5
DB6 I/O 32 Data Bus 6
DB7 I/O 33 Data Bus 7
DBP I/O 34 Data Bus Parity
TERMPWR 38 Terminator Power
ATN I 41 Attention
BSY I/O 43 Busy
25
1
50 26