3-8
Setup and Installation
Note:
A base I/O address switch has value only when set to its OFF
position.
Notice that the least significant address line in Figure 3-2 is A5. This line
has a decimal value of 32; therefore, the address you select is on a 32-byte
boundary, giving the board access to 32 I/O address ports (the board
actually uses a maximum of only 22 address ports, as shown in the I/O
address maps of Section 6).
Setting the IRQ Level
A PIO-SSR Series board can generate an IRQ signal on the rising edge of
any input signal from either the C0 or C3 input channel. To gate the IRQ
signal to your computer, you must place a jumper on one of the IRQ-level
settings of the jumper block. The IRQ-level options on the jumper block
are 3 to 7, 9 to 12, 14, and 15. The jumper block also contains a position
labelled
X
for no connection. Your board is preset at the factory for the X
position, as shown in Figure 3-3.
Figure 3-3. Jumper Block for Selection of IRQ Level
9
3
4
5
6
7
10
11
12
14
15
X
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