HP VXI 75000 C Series, User'S And Scpi Programming Manual

Page: 151 / 438

Algorithm Language Reference 151 Chapter 5
When user_flag is positive, returns user_value * 2 in CVT 331
When user_flag is negative, returns user_value / 2 in CVT 331 and in FIFO
Use the SCPI command ALGorithm:SCALar followed by ALGorithm:UPDate to set
user_flag and user_value.
*/
static float user_flag;
/* Declaration statements (end with ; ) */
static float user_value;
writecvt (user_flag,330); /* Always write user_flag in CVT (statement ends with ; ) */
if (user_flag ) /* if statement (note no ; ) */
{ /* brace opens compound statement */
if (user_flag > 0) writecvt (user_value * 2,331); /* one-line if statement (writecvt ends with ; ) */
else /* else immediately follows complete if-statement construct */
{ /* open compound statement for else clause */
writecvt (user_value / 2,331); /* each simple statement ends in ; (even within compound ) */
writefifo (user_value); /* these two statements could combine with writeboth () */
} /* close compound statement for else clause */
} /* close compound statement for first if */
else writecvt (0,331);/* else clause goes with first if statement. Note single line else */
Where to go Next
If you have already read Chapter 3 “Programming the HP E1415 for PID
Control”, you should now go to Chapter 4 “Algorithm Language
Reference”. It is very important to read Chapter 3 first since almost all of the
programming steps for PIDs apply to programming the HP E1415 to run
custom algorithms.