Anritsu ML2400A Series - Page 223

Bi nary Out put
Mes sage De coding
The fol low ing pro gram ex am ple may be used to de code the three types of bi -
nary out put mes sages. The com mands that ref er ence this code ex am ple are
OGBD, MXGDB and MNGDB for the GRAPH_BINARY_DATA de cod ing;
OFFTBR for the OFFSET_TABLE_BINARY_DATA de cod ing; and CFURD for
the CAL_FACTOR_BINARY_DATA de cod ing.
/*************************************************************************/
/* Decode binary outputs example */
/* This function expects the binary response from the command to be held in a global */
/* character array buffer. The passed parameter ‘decode type’ will be one of the global */
/* definitions */
/* GRAPH_BINARY_DATA */
/* OFFSET_TABLE_BINARY_DATA, CAL_FACTOR_BINARY_DATA */
/*************************************************************************/
void buffer_decode(int decode_type)
{
int count;
long *bin_value;
char *cptr;
char ch_val[6];
int length;
if (decode_type == GRAPH_BINARY_DATA)
{
/* FOR OGBD, MXGDB and MNGDB */
/********************* Decode header ************************/
/* Find # character. */
cptr = strtok(&buffer[0],"#");
cptr = strtok(NULL,"#");
/* Get the number of characters for binary length */
ch_val[0] = *cptr++;
ch_val[1] = NULL;
count = atoi(&ch_val[0]);
/* Get length of binary data */
for (loop = 0; loop < count; loop++)
{
ch_val[loop] = *cptr++;
}
ch_val[count] = NULL;
length = atoi(&ch_val[0]);
/* If reading in a binary graph the data will be in */
/* 1024LONG format. In this format each of the graph */
/* values are held as the dB value multiplied by 1024 */
/* and held in LONG form. */
/* */
/* Each long is 4 byte in length. To read and transpose
the values into real dB values each set of 4 bytes
are read into a long variable and then cast into a
float type and then divided by 1024.
*/
count = 0;
loop = 0;
bin_value = (long *)cptr; /* Set the long pointer */
6-136 ML2400A OM
PROGRAMMING EXAMPLES GPIB OPERATION