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Switch on
bit = 0
Switch off
bit = 1
Serial 1 uses SW1
Serial 2 uses SW2
Factory default setting for Serial 1 --- 03F8 hex (COM1)
ON
1 2 3 4 5 6 7 8
8 2 1
F
4
8
8
2 1
3
0
SW1
Factory default setting for Serial 2 --- 02F8 hex (COM2)
ON
1 2 3 4 5 6 7 8
8 2 1
F
4
8
8
2 0
2
0
SW2
Example: 03E8 hex (typical for COM3)
ON
1 2 3 4 5 6 7 8
8 2 0
E
4
8
8
2 1
3
0
Example: 02E8 hex (typical for COM4)
ON
1 2 3 4 5 6 7 8
8 2 0
E
4
8
8
2 0
2
0
Figure 4 --- Serial Port base I/O address selection switches
Quatech
DS-102 User's Manual
5