User`s guide

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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