Design Analysis H-350XL, Owner'S Manual, Page: 242 / 272

22-8 Functions
XL™ Series
e
The value for
e
is 2.71828182846.
Entering Functions:
The main functions can only be entered or edited using the menu or command interface over the
serial port, not from the built in display/keypad. As stated above, to change a function press a key
0 to 9 for the desired function. The unit will prompt the user with the following text “E - Edit T -
Test Function.” Pressing the ‘E’ key allows the user to edit the function expression. Once the
function is entered, press the ENTER key and the function expression will be evaluated and any
errors in the function will be displayed. If there are no errors the calculated value will be
displayed. If a function needs minor editing, use the Left and Right Arrow keys to move back
and forth through the function, and the Delete key to remove unwanted characters.
Note: no
spaces can be used when entering a function.
There are 31 bytes of memory reserved for each function. If a function expression is more than
31 bytes then space from the next function will be used. A single function can be up to 127
characters long, but remember this would use the space from three additional functions. If a
function is greater than the 31 bytes, the display will not list the next function as a usable
function. Notice how function 04 on the following screen is not listed because function 03 has
more the 31 characters in its expression.
Functions Menu 01 to 10 (Esc to Return)
1 - Fnt01 = ana1*72.0
2 - Fnt02 = 9/5*32
3 - Fnt03 = 23.5*ana1^3+45.32*ana1^2-87.4*ana1+76.32
5 - Fnt05 = 0
6 - Fnt06 = 0
7 - Fnt07 = 0
8 - Fnt08 = 0
9 - Fnt09 = 0
0 - Fnt10 = 0
N - Next
V - View Values
Enter Option >
User Defined Constants:
A function may also be used as a user defined constant. For example, lets say a constant of
23.76258 is used repeatedly, then enter for fnt01, “fnt01 = 23.76258.” Now use fnt01 in other
functions such as, “fnt02 = fnt01* ana1 + fnt01 * ana2.” This would be the same as the function
“fnt02 = 23.76258 * ana1 + 23.76258 * ana2”. The more the constant is used the more useful this
becomes.
Specific Purpose Functions:
There are three special purpose functions: one to define when a GOES random transmission
should be sent an one for each of the two digital I/O outputs. The function for the GOES random