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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.
10 1E1 07ADF4
H05 H30 H31 H31H45 H31 H30 H37 H41 H44 H46 H34
(Example1)
Computer
→
Inverter
ASCII code
→
Station
number
Instruction
code
*Waiting
time
Data
Sum check
code
←
Binary code
Sum
↓
30 + 31 + 45 + 31 + 31 + 30 + 37 + 41 + 44
=1F4
HH HHHHHHH
H
0 117030
H02 H30 H31 H37H31 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
HHHHHH
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.