PCI-D96SU/D128SU Card
User Manual, Ver. 1.0, Apr. 2019, PMH-031-10 Page 12
2.7
Pattern Match Function
The PCI-D96SU supports the pattern match function for Port0 (PA), Port1 (PB) and Port2 (PC) of
Digital Input, while the PCI-D128SU supports the pattern match function for Port0 (PA), Port1 (PB),
Port2 (PC) and Port3 (PD) of Digital Input. It monitors the status of the enabled input channels,
which are chosen in
, and compares the received state values with the compare values
written in
. When the actual state values match the compare values,
the PCI-D96SU/D128SU will deliver a trigger (interrupt) signal to the system. This function releases
the CPU from the burden of polling all of the I/O points, enabling a computer to handle more I/O
points with higher performance.
The following is an example:
Assume that the pattern match function for the DI Port0 (PA) of the PCI-D128SU is enabled (i.e. the
DI Port1 (PB), Port2 (PC) and Port3 (PD) on the PCI-D128SU are ignored during the patter match
monitoring process). The user can set the compare values for the enabled input channels, and these
will be compared to the actual channel states of the enabled channels.
2.8
Change of State Function
The PCI-D96SU/D128SU supports the change of state function for Port0 (PA) and Port1 (PB) of
Digital Input. It monitors the status of the enabled input channels, which are chosen in
When one of the enabled DI channels changes its state, the PCI-D96SU/D128SU delivers a trigger
(interrupt) signal to the system to handle this event.
The following is an example:
Assume that the change of state function for the DI channels Port1 (PB) on the PCI-D128SU is
enabled (i.e. the signals in Port0 (PA) on the PCI-D128SU is ignored during the change of state
process). When a change of state occurs in the Port1 (PB), an interrupt signal will be delivered to
the system.
