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Communication functions (Pr. 117 to Pr. 124)
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.
(Example 1)
Computer
ASCII code
*
: When the Pr. 123 "waiting time setting" setting is other than 9999, create the communication request
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
Computer
ASCII code
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 150.)
CAUTION
1. When the data from the computer has an error, the inverter does not accept that data.
2. Any data communication, e.g. run command or monitoring, is started when the computer gives a
communication request. Without the computer's command, the inverter does not return any data. For
monitoring, etc. therefore, design the program to cause the computer to provide a data read request
as required.
Station
Instruction
ENQ
number
Inverter
0
1
H05
H30 H31
H45 H31
H
H
H
+
+
+
30
31
45
H
= 1F4
Sum
Station
STX
number
0
1
H02
H30 H31
H31 H37
H
H
H
+
+
+
30
31
31
H
= 130
Sum
*
Waiting
Data
time
code
E
1
0
7
A
D
1
H31
H30 H37 H41 H44 H46 H34
H
H
H
H
H
H
+
+
+
+
+
31
31
30
37
41
44
Sum check
Read data
ETX
code
1
7
7
0
3
0
H37
H30 H03 H33 H30
H
H
H
+
+
37
37
30
146
Sum check
code
F
4
Binary code
Binary code
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Troubleshooting
