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Chapter 2
Using the Digitizer
Chapter Contents
This chapter contains example programs that show you how to use the
digitizer. The programs, which demonstrate the various features of the
digitizer, are presented in the same sequence as the features are covered in
Chapter 3 - "Understanding the Digitizer". The examples in this chapter
include:
• Configuring the Digitizer Input . . . . . . . . . . . . . . . . . . . . . . . 50
• Taking a Burst of Readings . . . . . . . . . . . . . . . . . . . . . . . . . . 51
• Level Arming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
• Pre- and Post-Arm Readings . . . . . . . . . . . . . . . . . . . . . . . . . 53
• Specifying a Sample Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
• Dual Rate Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
• Using Multiple Digitizers . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
• Using the Packed Data Format . . . . . . . . . . . . . . . . . . . . . . . 59
• VME Bus Data Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
VME_REAL.C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
VME_•SEG1.C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
• VME Bus Data Transfers Using an Embedded
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
SEGTST16.CPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
SEGTST32.CPP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
• Local Bus Data Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
LOCAL_AD.C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
LBUS2PST.C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
LBUSAUTO.C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
• Using the Digitizer Status Registers . . . . . . . . . . . . . . . . . . . 101
Using the Programs Each example program listed in this chapter (and on the example programs
disk) begins with the CONFigure command, and then uses lower-level
digitizer commands (Chapter 1, Table 1-3) to customize the configuration.
Using this format, the programs can easily be modified to match your
application.
The Programming
Language
Each example in this chapter lists only the digitizer’s SCPI commands, with
the exception of the VME and Local bus data transfer programs. The I/O
(input/output) constructs of the programming language you use need to be
added to the programs. Note that the example programs disk (HP P/N
E1429-10302) contains copies of the programs compiled and tested using
Borland Turbo C++ © Version 1.0 and Microsoft® QuickC© Version 2.0.
The program name is shown prior to the program listing in the chapter.
Chapter 2 Usin
g
the Di
g
itizer 49