PARAMETERS
114
7) Sum check code
The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum
(binary) derived from the checked ASCII data.
1
0
1
E
1
0
7
A
D
F
4
H05
H30
H31
H31
H45
H31
H30
H37
H41
H44
H46
H34
(Example1)
Computer
→
Inverter
ASCII code
→
Station
number
Instruction
code
*W
ai
ti
ng
ti
m
e
Data
Sum check
code
←
Binary code
Sum
↓
30 + 31 + 45 + 31 + 31 + 30 + 37 + 41 + 44
=1F4
H
H
H
H
H
H
H
H
H
H
0
1
1
7
0
3
0
H02
H30
H31
H37
H31
H37
H30
H03
H33
H30
7
(Example2)
Inverter
→
Computer
ASCII code
→
←
Binary code
Sum check
code
STX
Station
number
Read data
ETX
Sum
↓
30 + 31 + 31 + 37 + 37 + 30
=130
H
H
H
H
H
H
H
ENQ
*When Pr. 123 "waiting time setting"
≠
9999, create the communication request data with no "waiting time" in the data format.
(The number of characters is decreased by 1.)
8) Error code
If any error is found in the data received by the inverter, its definition is sent back to the computer together
with the NAK code. (Refer to page 118)
Note: 1. When the data from the computer has an error, the inverter will not accept that data.
2. Any data communication, e.g. run command, monitoring, is started when the computer
gives a communication request. Without the computer's command, the inverter does not
return any data. For monitoring, therefore, design the program to cause the computer to
provide a data read request as required.
3. Data for link parameter expansion setting differs as indicated below between access to
Pr. 0 to Pr. 99 values and access to Pr. 100 to Pr. 905:
Instruction
Code
Data
Read
H7F
Link parameter
expansion setting
Write
HFF
H00: Pr. 0 to Pr. 79 values are accessible.
H01: Pr. 100 to Pr. 158 and Pr. 900 to Pr. 905 values are
accessible.
H02: Pr. 160 to Pr. 244 values are accessible.
H03: Pr. 300 to Pr. 348 values are accessible.
H05: Pr. 500 to Pr. 516 values are accessible.
(NA, EC versions only)
H09: Pr. 990 and Pr.991 values are accessible.
