Mitsubishi Electric 800 Series Instruction Manual page 490

• Sum check code
The sum check code is a 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum derived from the checked
ASCII data.
(Example 1)
Computer
ASCII Code
* When the Pr.123 or Pr.337 (Waiting time setting)
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
ASCII Code
• 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 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
HC Data range error
HD —
HE —
HF Normal (no error)
Instruction
ENQ Station
Inverter
number
0 1 E
H05 H30 H31 H45 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
= H1F4
Sum
Station
STX
Computer
number
0 1 1
H02 H30 H31 H31 H37
H30+H31+H31+H37+H37+H30
= H130
Sum
Error Description
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, set frequency
setting, etc.
—
—
—
Data
code
1 1 0 7 A D
H31 H30 H37 H41 H44 H46 H34
"9999", create the communication request
Sum
Data read
ETX
check
code
7 7 0 3 0
H37 H30 H03 H33 H30
5.12 (N) Operation via communication and its settings
Sum
check
code
F 4 Binary code
Binary code
Inverter Operation
Trips (E.PUE/E.SER) if error
occurs continuously more
than the permissible number
of retries.
The LF signal is output.
—
Does not accept the received
data, but the inverter does not
trip.
—
—
Does not accept the received
data, but the inverter does not
trip.
—
—
—
5. PARAMETERS
3
4
5
5
5
6
7
8
9
10
489