Specifications

Setting Filter Cutoff Frequency ............................................. 57
Linking Channels to EU Conversion .........................................58
Linking Output Channels to Functions ....................................... 66
Setting Up Digital Input and Output Channels ................................... 66
Setting Up Digital Inputs .................................................. 66
Setting Up Digital Outputs ................................................ 67
Performing Channel Calibration (Important!).................................... 71
Defining C Language Algorithms ............................................ 73
Global Variable Definition ................................................ 73
Algorithm Definition ..................................................... 74
Pre-Setting Algorithm Variables ............................................ 74
Defining Data Storage ...................................................... 75
Specifying the Data Format ................................................ 75
Selecting the FIFO Mode.................................................. 76
Setting up the Trigger System ................................................ 77
Arm and Trigger Sources ................................................. 77
Programming the Trigger Timer ............................................ 79
Setting the Trigger Counter ................................................ 79
Outputting Trigger Signals ................................................ 79
Initiating/Running Algorithms ............................................... 80
Starting Algorithms ...................................................... 80
The Operating Sequence .................................................. 81
Retrieving Algorithm Data .................................................. 81
Modifying Running Algorithm Variables ....................................... 85
Updating the Algorithm Variables and Coefficients .............................85
Enabling and Disabling Algorithms ......................................... 85
Setting Algorithm Execution Frequency ......................................86
Example Command Sequence................................................ 86
Using the Status System .................................................... 88
Enabling Events to be Reported in the Status Byte ..............................91
Reading the Status Byte................................................... 92
Clearing the Enable Registers .............................................. 93
The Status Byte Group’s Enable Register .....................................93
Reading Status Groups Directly ............................................ 93
VT1419A Background Operation ............................................. 94
Updating the Status System and VXIbus Interrupts ............................... 95
Creating and Loading Custom EU Conversion Tables .............................96
Compensating for System Offsets ............................................. 97
Special Considerations.................................................... 99
Detecting Open Transducers ................................................ 100
More On Auto Ranging.................................................... 101
Settling Characteristics .................................................... 101
Background ........................................................... 101
Checking for Problems .................................................. 102
Fixing the Problem ..................................................... 102
Chapter 4. The Algorithm Language and Environment ..............................105
About This Chapter ....................................................... 105
Overview of the Algorithm Language......................................... 106
Example Language Usage ................................................ 107
The Algorithm Execution Environment ....................................... 108
The Main Function
..................................................... 108
6 Contents
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