Fuji Electric FRENIC-AQUA series User Manual page 79

(Example) When setting 20 Hz with function code S01 (speed setting 1) (maximum frequency =
60 Hz)
1) Calculate the set value according to the data format of S01 (±20000/maximum frequency).
Data = 20 Hz x ±20000/60 Hz (+ for forward rotation, − for reverse rotation)
=±6666.6
≈±6667
2) Convert the data into hexadecimal (a complement of 2 in the case of negative data).
Data = 6667 ............................................ (forward rotation)
=1A0B
H
Data = −6667 .......................................... (reverse rotation)
= 0 − 6667
Thus,
65536 − 6667 = 58869 = E5F5
3) Set the data.
Position
Data's first character
Data's second character
Data's third character
Data's fourth character
[ 3 ] Checksum field
The data in this field is intended to check whether there is any error in the communications
frame at the time of data transmission. Calculate the data by adding one byte to all fields,
except for S0H and the checksum field, treating the last byte of the result as a two-digit
hexadecimal value, and converting each digit into an ASCII code.
(Example) When the result of addition is 0123
Position
Checksum 1
Checksum 2
H
Set value (forward rotation)
ASCII 1
ASCII A
ASCII 0
ASCII B
H
Set value (forward rotation)
ASCII 2
ASCII 3
4-12
Set value (reverse rotation)
ASCII E
ASCII 5
ASCII F
ASCII 5