Pressure Systems 9022 Instrukcja Użytkownika Pobierz pdf (Strona 64)

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

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Purpose: Defines and controls the autonomous delivery of any of up to three concurrent

high-speed autonomous data streams to the host computer. Such data streams

may be delivered “continuously” without bound (i.e., until a command explicitly

stops them), or be delivered in a “limited” amount (until a pre-specified fixed

number of data packets have been sent). Each packet delivered may be

synchronized by a user-supplied “hardware trigger” or each packet may be

delivered periodically as synchronized by an internal software clock. These

concurrent host streams are an alternate method of acquiring/delivering data rather

than using the Read High-Precision Data (‘r’) command, the Read High-Speed

Data (‘b’) command or the many other special purpose read commands (‘V,’ ‘a,’

‘t,’ ‘m,’ and ‘n,’) for reading alternate data values.

Host data streams, once activated in a module, deliver a sequence of TCP/IP or

UDP/IP data packets autonomously to the host (i.e., without the host sending any

particular command to the module to request each packet).

Various sub-commands (described on the following pages) are used to identify the

various definition and control options of the following general ‘c’ command.

Command

“c ii[ dddd] ... ”

‘c’ is the command letter

‘ ii’ is a space + a sub-command index (augment code)

‘ dddd’ are one or more optional datum fields, each preceded by a space

character which are parameters that differ per augment code ii.

NOTE: all parameters are separated by a space.

Response

Depends upon particular sub-command (‘ ii’) sent. See below.

Autonomous

Packet:

Depends upon the particular sub-command

(‘ ii’) sent. See below.

WARNING: If these data streams are defined to occur at high rates, then each data

packet received by the host must be processed and disposed of in a timely

manner. NetScanner



System modules are capable of generating autonomous

data faster than some “slow” hosts (or incapable software) can absorb.

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Pressure Systems 9022 Instrukcja Użytkownika Strona 64