Cascade CIF Driver in Linux not communicating with card

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## 5.3. Cascade CIF Driver in Linux not communicating with card

### Problem:

The Cascade CIF Driver running in Linux is not communicating with the card.

### Cause:

This is a side-effect of not having interrupt mode available in Linux. 10ms is the fastest that an unmodified linux kernel can run.

### Solution:

Add a command to the configuration file:

        (cardPoll 0 10)

to get a 10 millisecond poll rate between the driver and the card. In previous versions of the driver, the (group...) command was enough to cause a default poll rate. We chose to make this explicit so that the user could control the timing in the driver better.

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