Manual PCIe-DIO-24HS PCI Express Digital I/O Card
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Base AB (read/write) IRQ Enable DIO COS (S models) and C3
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Bit 2
Bit 1
Bit 0
‘0’
‘0’
‘0’
‘0’
‘0’
Port C Port B Port A
Table 5-7
: Base +B, IRQ Enable COS and C3
At power-up or reset, all IRQ sources on the card are disabled. To enable the COS IRQ, write
a zero to the bits that correspond to the port(s) desired. Any changes detected on the bits
within the enabled port(s) will generate an IRQ. To disable COS IRQ, write a one to bits that
correspond to the port(s) desired.
Base AC Not Used
Base AD (write) IRQ Disable Global
Write any value to this address to disable all IRQ sources on the card.
Base AE (read/write) IRQ Enable Port C bit-3
Bit 7 Bit 6
Bit 5
Bit 4
Bit 3 Bit 2 Bit 1 Bit 0
‘0’
‘0’
‘IRQ Output’
‘1’
‘0’
‘0’
‘0’
C3
Table 5-8
: Base +E, Port C3 IRQ Enable
At power-up or reset, all IRQ sources on the card are disabled.
To enable the C3 IRQ, write a one to bit 0. A rising edge detected on bit 3 of Port C will
generate an IRQ. To disable the C3 IRQ, write a zero to bit 0.
Bit 4 is a read-
only, and is always a ‘1’ to maintain backwards compatibility with the PCIe-DIO-
24DS.
Bit 5 is a read-
only, which is the status of the board IRQ output pin. A “1” indicates the IRQ is
active (latched). A “0” indicates no IRQ is pending.
Base AF (write) IRQ Clear
Any value written to this address will clear the status bit and pending IRQ.
