Mitsubishi Electric F700 Instruction Manual page 173
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Communication operation and setting
6) 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"
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Computer
ASCII Code
7) 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.
Error
Error Item
Code
H0
Computer NAK error
H1
Parity error
H2
Sum check error
H3
Protocol error
H4
Framing error
H5
Overrun error
H6
H7
Character error
H8
H9
HA
Mode error
HB
Instruction code error The specified command does not exist.
HC
Data range error
HD
HE
HF
166
Instruction
ENQ
Station
Inverter
number
0
1
E
H05
H30 H31
H45 H31
H
H
H
+
+
+
30 31 45 31 31 30 37 41 44
H
= 1F4
Sum
"9999", create the communication request
Station
STX
Inverter
number
0
1
H02
H30 H31
H31 H37
H
H
H
+
+
+
30 31 31 37 37 30
H
= 130
Sum
The
number
communication request data from the computer is greater than
allowed number of retries.
The parity check result does not match the specified parity.
The sum check code in the computer does not match that of
the data received by the inverter.
The data received by the inverter has a grammatical mistake.
Alternatively, data receive is not completed within the
predetermined time. CR or LF is not as set in the parameter.
The stop bit length differs from the initial setting.
New data has been sent by the computer before the inverter
completes receiving the preceding data.
The character received is invalid (other than 0 to 9, A to F,
control code).
Parameter write was attempted in other than the computer link
operation mode, when operation command source is not
selected or during inverter operation.
Invalid data has been specified for parameter write, frequency
setting, etc.
Data
code
1
1
0
7
A
D
H31
H30 H37 H41 H44 H46 H34
H
H
H
H
H
H
+
+
+
+
+
Sum
data read
ETX
check
code
1
7
7
0
3
0
H37
H30 H03 H33 H30
H
H
H
+
+
Error Definition
of
errors
consecutively
Sum
check
code
F
4
Binary code
Binary code
Inverter Operation
detected
in
Brought to an alarm
stop
if
error
continuously more than
the allowable number of
retries. (E.PUE/E.SER)
Does
not
received data but is not
brought to alarm stop.
Does
not
received data but is not
brought to alarm stop.
occurs
accept
accept
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