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Chapter 4

– 33 – PCI-1752/54/56 User’s Manual

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Interrupt Flag Bit

The interrupt flag bit is a flag indicating the status of an interrupt. It is

a readable/writable bit. To find the status of the interrupt, you have to

read the bit value; to clear the interrupt, you have to write “1” to this

bit. This bit must first be cleared to service the next incoming interrupt.

Table 4-5 Interrupt flag bit values

4.2 Board ID

The PCI-1752/1754/1756 has a built-in DIP switch (SW1), which is used

to define each card’s board ID. You can determine the board ID on the

same chassis, this board ID setting function is useful for identifying

each card’s device number through board ID. We set the PCI-1752/

1754/1756 board ID as 0 at the factory. If you need to adjust it to other

board ID, set the SW1 by referring to the Table 4-7.

Table 4-6 Board ID register

ID0: the least significant bit (LSB) of Board ID

ID3: the most significant bit (MSB) of Board ID

Fn Inte rrupt s tatus

No interrupt

Interrupt occur

Write 0

Don’t care

Clear interrupt

Board ID register

Base Add.+10

3210

Abbreviation

ID3 ID2 ID1 ID0

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 61 62

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Advantech PCI-1731 Manual de usuario Pagina 40