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Setting the Base Address Switch
The base address switch is preset at the factory for 300h (see Figure 3-1).
If 300h was also assigned to the board when you ran the DriverLINX Plug
and Play Wizard, you do not need to reset the address switch. Otherwise,
reset the base address switch to conform to the base address assigned
when you ran the Wizard.
The PDISO-8 requires four consecutive I/O addresses, but only two are
used: one is for output/readback and the other is for input. You can set the
base address on any 4-byte boundary using the Base Address DIP switch.
If you install additional PDISO-8 boards, you must set a different base
address for each board.
When a position of the base address switch is set in the ON
Note:
direction, it has zero value. For example, Figure 3-1 shows the switch
positions set for a value of 300h or 768 decimal.
Table 3-1 lists the values for each position of the base address switch.
Table 3-1. Values of Base Address Switch Positions
Switch
Position
1
2
3
4
5
6
7
8
Switch positions, as shown in Table 3-1, are marked on the switch
Note:
while corresponding address-line numbers are marked on the board and
just above the switch.
Value When Switch Is Off
Address
Decimal
Line
9
512
8
256
7
128
6
64
5
32
4
16
3
8
2
4
Hexadecimal
200
100
80
40
20
10
8
4
3-9
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