Pressure Systems 9022 Manual do Utilizador descarregar pdf (Página 65)

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

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Description: The firmware of any module, once fully initialized, continuously scans and

converts data for all pressure channels at the highest possible speed. The result of

such scanning is a continuously updated EU data buffer, available to three

concurrent host data delivery tasks, or available to other standard data acquisition

commands in the module. Each host delivery task can grab engineering-unit data

values from the EU data buffer and deliver them to the host in its own

programmable data stream (a sequence of TCP/IP or UDP/IP packets that

autonomously arrive in the host, as long as the host has enough TCP/IP buffering

space to hold them).

Special augments of this command, called sub-commands (distinguished by the

first parameter ii) can configure each data stream with the particular channels

whose data are delivered, the datum format, the delivery rate, and other

characteristics. It can also start, stop, or undefine a single stream or all defined

streams.

The maximum rate of any one stream’s delivery is practically limited to the

maximum possible scan and data conversion rate of all the module’s channels.

Normally, these programmable host streams deliver host data at rates equal to or

slower than this natural cycle. For a typical application, the first stream delivers a

few channels at a high rate as defined by a hardware trigger. The second stream

delivers other channels at a medium rate (some multiple of the trigger), and the

third stream can deliver still other channels at a slow rate (a larger multiple of the

trigger). In another application, the three streams might all be programmed to

deliver all the same channels, but the first stream might deliver pressure data (EU

only) at high speed. The second stream might deliver pressure counts or volts at a

slower rate, and the third stream might deliver temperature in all forms (EU,

counts, volts) at a very slow rate.

NOTE: Avoid confusing this Configure/Control Autonomous Host

Streams command ‘c’ (lower case c) with the Configure/Control Multi-Point

Calibration command ‘C’ (upper case C). Like ‘C’, but unlike most other

module commands, all sub-commands of this command require a space

between the command id (‘c’) and the first parameter (ii).

NOTE: When using hardware trigger inputs to synchronize data stream

outputs, the frequency of the trigger source should be no more than 200Hz

even if the requested output is 100Hz or less.

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Pressure Systems 9022 Manual do Utilizador Página 65