Omega Engineering High Speed Load Cell Interface Card..., Руководство пользователя

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3.3.2.1.4 Get results immediately
Controls card’s response in communication during a special mode, such as
the Fill mode:
When checked, the card assumes that the PC (or another remote computer)
is continuously connected and listening to the communication port.
Therefore, the card takes the initiative and sends messages to the PC,
reporting the process results immediately when they are available.
However, you might prefer the PC to poll the card from time to time
drawing the results, so that the PC can handle other tasks too. In the latter
case, uncheck the ‘Get results immediately’ option. For example, in the
Fill mode, use the ‘r’ command as described in section E.6.