Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 65)

For example, you want your input scale to be 15.25. This equals a squared value of 232.5625. The value
excluding the decimal point is larger than 1000000. Divide 2325625 by 10 to get 232653 with HEX value of
38C73. Then do the following:
1. Set bit 23 to 1
2. The existing decimal number is 5. Add 1 to get 6. This and part 1 makes the Most Significant character as
“F” value.
3. Your 3-byte HEX value = F38C73 HEX.
4. The meter interprets this as 232563 * 100=23256300. Since the decimal number is 6, the true value is
232.562.
NOTES:
1. Input scale and offset applies to the input frequency, therefore all measurement data like BATCH and TOTAL
values are affected according to the following formula:
2. Result = (Input value + Input_Offset) * Input_Scale
a) According to this equation, the offset unit of measure must be the same as that for the input value,
which is pulses/s or Hertz.
For example, the input frequency is 101.2 Hz and you want to calibrate it to 100 Hz, the offset value is
simply –1.2 which in HEX is A0000C.
b) In Sq Rt Mode, input scale and offset are applied on the input, before the square root is taken to give
the corresponding flow rate, then rate scale and offset are applied.
3. Maximum and Minimum Values
a) Input Scale Values
For Batch and Rate Modes, input scale values can range from 0 to 10000000.
For Sq Rt Mode, input scale values can range from 0 to 100,000,000.
b) Input Offset Values
For Batch and Rate Modes, input offset can be ±8000 Hz.
For Sq Rt Mode, input offset can be ±1000000 Hz.
EXAMPLE: You would like to send an input scale value of 653.84421 and an offset value of 34.3742 Hz to
EEPROM of meter 15. The meter is operating in Sq Rt Mode.
a) The input scale value is 65384421 and the decimal no. is 6. The value is larger 1000000, therefore
take the value as 653844. The Hex equivalent is 9FA14. The 3-byte data is E9FA14.
Send the command *15W23E9FA14. The meter will respond with 15W23.
b) The offset value is 343742 which is decimal 53EBE. The decimal number is 5 and the sign is
negative, so the 3-byte data is D53EBE.
Send the command *15W24D53EBE. The meter will respond with 15W24.
11.13 Batch Decimal Point (“BAT DP”), Rate Decimal Point (“RTE DP”), Total Decimal Point
(“TOT DP”)
These items are each 1 byte (2 characters) each use the command prefixes of G, P, R, and W. “BAT DP” and
“RTE DP” use the suffix 11; TOT DP uses the suffix 14.
CF 125 INFINITY SC GUIDE 61 M1519/N/0605