User`s guide

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3-7
3.10 FLOPPY CONNECTOR (CN2)
The AR-B1320 provides a 16-pin 2.0mm connector (CN2) to support one floppy disk drive. The
floppy drives may be one of the following:
•
5.25" : 360K or 1.2M
•
3.5" : 720K or 1.44M
To enable or disable the floppy disk controller, please use the BIOS Setup program. A floppy
adapter cable is used to connect between the CN2 connector (16-pin 2.0mm housing) and the
floppy disk drive. The following table illustrates the pin assignments of the floppy adapter cable.
CN2 34-PIN (Floppy Disk Drive) Function
5,11,16 1,3,5,7, 17, 27, 31, 33 Ground
1 2 -Reduce write current
2 8 -Index
4 16 -Motor enable A
3 12 -Drive select A
6 18 -Direction
7 20 -Step output pulse
8 22 -Write data
9 24 -Write enable
10 26 -Track 0
12 28 -Write protect
13 30 -Read data
14 32 -Side 1 select
15 34 -Disk change
--- Else No Connect
Table 3-5 Floppy Adapter Cable Pin Assignments
3.11 SERIAL PORT CONNECTORS (CN3, CN4 & CN5)
These 3 connectors serve the RS-232C/RS-485 of the COM-A port and the COM-B port.
•
CN3 : RS-232C connector for the COM-A port
•
CN4 : RS-232C connector for the COM-B port
•
CN5 : RS-485 connector for the COM-A and COM-B
Before you connect the serial port connectors, please refer to section 3.3 on how to set the switch
5 & 6 on SW1 for your desired use.
ON
123456
OFF
Figure 3-8 SW1-5 & 6 –RS-232/RS-485 Select