Chapter 3 - Installing Instrument Boards
71
Thus A12, A11, and A10 in the offset address area are used for
internal board address decoding.
2. Set the offset address.
The offset address of C000H in binary becomes -
1100,0000,0000,0000, which means settings of:
A15 A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4
1 1 0 0
0 0 0 0
0 0 0 0
3. Set the address mask.
Since A12, A11, and A10 are used in internal decoding, all three must have
their address mask set to OFF. Thus the final SW1 and SW2 settings are:
On On
Off Off
On
On
ADDRESS
MASK
OFFSET ADDRESS
BASE ADDRESS
ENABLE
DISABLE
SW2
SW1
0
1
Off
Off Off Off
On
Off Off
Figure 3-6: Example 2 address switches
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