12 hard disk controller (cn6) – Acrosser AR-B1320 User Manual
Page 29
A
A
R
R
-
-
B
B
1
1
3
3
2
2
0
0
U
U
s
s
e
e
r
r
’
’
s
s
G
G
u
u
i
i
d
d
e
e
3-9
3.11.3 RS-485 TERMINATOR (JP2 & JP3)
JP2 & JP3 are used to enable the RS-485 terminator resistor of COM-A and COM-B port
respectively. The value of the terminator resistor is 150 ohms. Close the jumper to enable the
RS-485 terminator and leave the jumper open to disable it.
COM Port
Jumper
When “Open”
When “Close”
Factory Preset
COM-A
JP2
Disabled
Enabled
Open
COM-B
JP3
Disabled
Enabled
Open
Table 3-7 JP2 & JP3: RS-485 Terminator
3.12 HARD DISK CONTROLLER (CN6)
A 44-pin header type connector (CN6) is provided to interface with up to two embedded hard disk
drives (IDE AT bus). This interface, through a 44-pin cable, allows the user to connect up to two
drives in a "daisy-chain" fashion. To enable or disable the hard disk controller, please use the
BIOS Setup program. The following table illustrates the pin assignments of the hard disk drive's
44-pin connector.
Pin
Function
Pin
Function
1
-Reset
2
Ground
3
Data 7
4
Data 8
5
Data 6
6
Data 9
7
Data 5
8
Data 10
9
Data 4
10
Data 11
11
Data 3
12
Data 12
13
Data 2
14
Data 13
15
Data 1
16
Data 14
17
Data 0
18
Data 15
19
Ground
20
Not used
21
Not used
22
Ground
23
-IOW
24
Ground
25
-IOR
26
Ground
27
Not used
28
BALE
29
Not used
30
Ground
31
IRQ 14
32
-IOCS16
33
SA1
34
Not used
35
SA0
36
SA2
37
-CS0
38
-CS1
39
Hard disk LED
40
Ground
41
VCC (+5V)
42
VCC (+5V)
43
Ground
44
Not used.
Table 3-8 CN6: IDE Connector