Anritsu Site Master S331D Bedienungsanleitung PDF herunterladen (Seite 115)

/*********************************************************************/

/* unsigned char SetSPAScale(unsigned long ReferenceLevel, */

/* unsigned long dBScale, BYTE *ResponseBytes) */

/* Description: This function implements control byte #101, Set */

/* Spectrum Analyzer Scale. It sets the spectrum */

/* analyzer reference level and scale (dB/div). */

/* Inputs : RefLevel = reference level value */

/* dBScale = scale value */

/* NOTE: This function assumes the values have */

/* already been checked to fall in the valid range */

/* and scaled according to the formulas in the */

/* Programming Manual. */

/* ResponseBytes = pointer to an array of bytes at */

/* least 1 element long (1 byte is expected in */

/* response to the Set Spectrum Analyzer Scale */

/* command). */

/* Returns: SUCCESS if the values are set */

/* FAILURE if the command fails */

/* Response bytes are returned in the variable */

/* ResponseBytes. */

/*********************************************************************/

unsigned char SetSPAScale(unsigned long RefLevel,

unsigned long dBScale, BYTE *ResponseBytes)

{

BYTE *SendScalePointer; // Data to send

BYTE SendBytes[9];

BYTE SerialCommand;

// Serial Command to Set Scale on the SPA.

SerialCommand = 101;

// Data pointer.

SendScalePointer = &SendByte[0];

// First byte to send is the serial command, #101.

SendBytes[0] = SerialCommand;

// Convert the reference level and scale into 8 bytes

// (4 bytes each) for the SPA. Put the bytes in the

// SendBytes variable, starting with byte 1 (leave byte 0

// as the command byte).

Get8Bytes(RefLevel, Scale, &SendBytes[1]);

// Write 9 bytes of data in SendScalePointer to the port.

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Anritsu Site Master S331D Bedienungsanleitung Seite 115