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Glossary of Terms

Bus typeMany IO devices are available on a variety of buses. The most frequent ones are PCI, ISA, and PXI. Use this parameter to indicate which bus type corresponds to your device.
Board address or PCI indexIf the card type is ISA or PC-104, enter its card address in hexadecimal format (ex: 0x300).
If the card type is PCI or PXI, enter its index. It is an integer associated to the card. Identical cards, cards that share the same vendor ID and device ID, are given sequential numbers when the PCI bus is scanned for devices so that they can be differentiated by the system. Should only one instance of a type of card be located in the system, its index will be 0. Should two or more identical cards be present, the first instance will be index 0, the second instance will be index 1 and so on. Should two different cards be present, they will both have index 0, since they can be differentiated by their vendor ID or device ID.
Similarly, for PCMCIA cards, the index is an integer associated with the card. The cards are numbered sequentially as each slot of each PCMCIA adapter installed in the system is scanned for a given type of card.
Reset, pause and run inportsThese inports are used to specify values that are written to the I/O device during 3 different phase of execution:
reset: Values that are transferred to the I/O device when the model enters reset, that is, for instance, at initialization or when the reset button is hit.
pause: Values are transferred to the I/O device when the model enters a pause, that is, for instance, at initialization or when the pause button is hit.
run: Values that are transferred to the I/O device at each calculation step.
Note: To ensure that the pause and reset values are properly used, it is recommended to set these values in the model subsystem that contain the IO device block, and not to provide them from the console subsystem. All signals do not need to have the same width or absolutely require to be connected. For most, IO library blocks, devices will remain with the last value if reset and/or pause inports are unused.
SynchronizeSelect this option to enable the model synchronization of the I/O. This will force IO accesses (acquisition/commands) to be executed at the beginning of each calculation step, as opposed to when the block comes to be executed in the model.
Sample TimeThis parameter allows the user to define the length of the sample time for this block in seconds. Supported values follow the Simulink definition for continuous, discrete or inherited sample time. The default is 0 (continuous).

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