Measurement Specialties 9116 User Manual

Pressure Systems, Inc.                                                                                        Model 9116 User’s Manual 
 
 

 

Page 46 

 

www.PressureSystems.com 

 

 
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- 

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). 

 

“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. 

 
 
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).