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Chapter 6. Hardware Setup 77
Differences Between 6.x and 7.x Drivers
Many of the differences between 6.x and 7.x drivers are new features. To learn more
about these features, refer to The SI7 I/O Driver Features.
The architecture of 6.x and 7.x drivers is also different. With 6.x drivers, the driver
consists of two parts: a polling portion and a configuration portion. The polling
portion only polls. The configuration portion can load, manipulate, and save
configurations. When FIX or iFIX is running, the configuration portion can load
(open) configurations without affecting which configuration the polling portion is
using. You can also reload a driver configuration. This action replaces the
configuration in the polling portion with the currently-open configuration.
With 7.x drivers, the driver also consists of two parts: a server portion and a client
portion (the Power Tool). The server portion handles polling as well as loading,
manipulating, and saving configurations. The client is simply a graphical interface
that tells the server portion when to load, manipulate, save, run, and stop. With FIX
or iFIX running, the client (Power Tool) can load (open) a new configuration. This
action replaces the configuration in the server with the configuration just loaded. In
effect, the 7.x driver can only work with one configuration at a time. As a result, if
you load a different configuration into the Power Tool than the one currently running,
the current configuration being polled is replaced, and your database tags may
become invalid.
Other differences include:
7.x drivers no longer require the configuration to be called nodename.SI7.
Instead, the default file name is configurable. To learn how to set the default
configuration file name and change the default path, refer to Setting Defaults
for I/O Driver Configuration File Name and Path.
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