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44 Agilent VISA User’s Guide

3 Programming with VISA

These are raw I/O functions and do not intermix with the

formatted I/O functions. See “Using Non- Formatted I/O” in

this chapter for details. See the VISA Online Help for more

information on how data is converted under the control of

the format string.

Formatted I/O Functions

As noted, the VISA formatted I/O functions are viPrintf,

viQueryf, and viScanf.

• The viPrintf functions format according to the format

string and send data to a device. The viPrintf function

sends separate arg parameters, while the viVPrintf

function sends a list of parameters in params:

viPrintf(vi, writeFmt[, arg1][, arg2][, ...]);

viVPrintf(vi, writeFmt, params);

• The viScanf functions receive and convert data according

to the format string. The viScanf function receives

separate arg parameters, while the viVScanf function

receives a list of parameters in params:

viScanf(vi, readFmt[, arg1][, arg2][, ...]);

viVScanf(vi, readFmt, params);

• The viQueryf functions format and send data to a device

and then immediately receive and convert the response

data. Hence, the viQueryf function is a combination of the

viPrintf and viScanf functions. Similarly, the viVQueryf

function is a combination of the viVPrintf and viVScanf

functions. The viQueryf function sends and receives

separate arg parameters, while the viVQueryf function

sends and receives a list of parameters in params:

viQueryf(vi, writeFmt, readFmt[, arg1]

[, arg2][, ...]);

viVQueryf(vi, writeFmt, readFmt, params);

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Agilent Technologies FS2010 Guide de l'utilisateur Page 44