Define/Control Autonomous Host Streams - Pressure Systems 9022 User Manual

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DEFINE/CONTROL AUTONOMOUS HOST STREAMS (Command 'c')
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).
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.
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
Response
Autonomous
Packet:
"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.
Depends upon particular sub-command (' ii') sent. See below.
Depends upon the particular sub-command
(' ii') sent. See below.
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