Site master pm 109 – Anritsu Site Master S331D User Manual
Page 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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