Mitsubishi Electric 800 Series Instruction Manual page 135

• 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 Inverter
ASCII Code
* When the Pr.123 PU communication waiting time setting
request data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
Computer
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 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)
134
3. RS-485 Communication
3.4 Mitsubishi inverter protocol (computer link communication)
Instruction
ENQ Station
code
number
0 1 E 1 1
H05 H30 H31 H45 H31 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
= H1F4
Sum
Data read
Station
STX
number
0 1 1 7 7
H02 H30 H31 H31 H37 H37
H30+H31+H31+H37+H37+H30
= H130
Sum
Error item
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.
—
—
—
Sum
check
Data
code
0 7 A D F 4
H30 H37 H41 H44 H46 H34
"9999", create the communication
Sum
ETX
check
code
0 3 0
Binary code
H30 H03 H33 H30
Error description
Binary code
Inverter operation
The inverter output is shut off
(E.PUE) 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.
—
—
—