Pressure Systems 9022 Uživatelský manuál stáhnout pdf (Strana 67)

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Measurement Specialties Inc. NetScanner System (9016, 9021, & 9022) User’s Manual

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When the hardware trigger is used to synchronize data output ( sync = 0), it is

assumed that the user would prefer to also synchronize internal data acquisition

cycle. For this reason, when a stream utilizing hardware trigger is started, the

module firmware switches out of the free-running continuous data acquisition

mode described earlier. Instead, the module waits in an idle mode until a

hardware trigger is received to initiate a host stream output. Only on the receipt

of that hardware trigger will the module scan and EU convert all attached

channels. Following completion of the acquisition and EU conversion cycle, the

module will also deliver the requested data channels to the host. In this manner,

users are provided with highly synchronized data acquisition and delivery from

one or more modules. If a module waits in the idle mode for an extended period

of time without receiving a data request, it will periodically initiate its own internal

data acquisition cycles so as to update internal thermal coefficients.

When all hardware triggered streams are complete or aborted, an individual

module will return to the default mode of continuous scanning and EU conversion.

When the internal software timer is used to control host stream output rates

(sync=1), note that internal clock frequency variances will result in slightly

different timing between modules. Although these differences in timing are

slight, they may result in noticeable differences in output timing between modules

over a long period of time. If highly synchronized data output is required from

multiple modules, the hardware trigger mode should be used.

The period ‘per’ parameter is a positive decimal integer count (from 0 to

2147483647, specified with 1 to 10 numeric digits as needed), and its meaning

depends on the sync type ‘sync’ parameter described above.

‘sync’

meaning of ‘per’

number of hardware trigger periods to wait before sending each packet

delay period (in milliseconds) to wait before sending each packet NOTE:

minimum is 10 milliseconds

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Pressure Systems 9022 Uživatelský manuál Strana 67