SCSI接口定义图(25针外置)
SCSI 是 Small Computer System Interface 的缩写，外置式 25 针接口为扫描仪等低速设备使用，接口外观为母插座：
连接电缆插头为 25 针公插头：
引脚定义
Pin
Name
Dir
DescripTIon
1
GND
Ground
2
DB1
Data Bus 1
3
DB3
Data Bus 3
4
DB5
Data Bus 5
5
DB7
Data Bus 7
6
GND
Ground
7
/SEL
Select
8
GND
Ground
9
TMPWR
TerminaTIon Power
10
/RST
Reset
11
C/D
Control/Data
12
I/O
Input/Output
13
GND
Ground
14
DB0
Data Bus 0
15
DB2
Data Bus 2
16
DB4
Data Bus 4
17
DB6
Data Bus 6
18
PARITY
Data Parity
19
GND
Ground
20
/ATN
AttenTIon
21
/MSG
Message
22
/ACK
Acknowledge
23
BSY
Busy
24
/REQ
Request
25
GND
Ground
