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• Error code
If any error is found in the data received by the inverter, its error definition is sent back to the computer together with the
NAK code.
Error code
Error item
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
HC
Data range error
HD
HE
HF
Normal (no error)
 Response time
Computer
Inverter
Inverter
Computer
[Formula for data transmission time]
1
Communication
speed (bps)
*1
Refer to
page
485.
*2
Communication specifications
Name
Stop bit length
Data length
With
Parity check
Without
In addition to the above, 1 start bit is necessary.
Minimum number of total bits: 9 bits
Maximum number of total bits: 12 bits
The number of errors consecutively detected in
communication request data from the computer is greater
than the permissible 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.
Or, data receive is not completed within the predetermined
time. The CR or LF code specification is not the same as the
setting of 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 when the inverter does not
perform computer link communication, when the operation
commands are not given through communication, or during
inverter operation.
The specified instruction code does not exist.
Invalid data has been specified for parameter writing, running
frequency setting, etc.
Data sending time (refer to the following formula)
Inverter data processing time
10 ms or more necessary
Data sending time (refer to the following formula)
Number of data characters *1
Number of bits
1 bit
2 bits
7 bits
8 bits
1 bit
0
Error description
Waiting time
Data check time
(setting
10 ms)
(depends on the
instruction code*3)
Time
Communication specifications
data transmission time (s)
(Total number of bits) *2
5.12 (N) Communication operation parameters
Inverter operation
The inverter output is shut off
(E.PUE/E.SER) if error occurs
continuously more than the
permissible number of retries.
The LF signal is output.
The inverter does not accept the
received data. However, the
inverter output is not shut off.
The inverter does not accept the
received data. However, the
inverter output is not shut off.
5. PARAMETERS
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