119
5. PARAMETERS
5.7 (N) Communication operation parameters
1
2
3
4
5
6
7
8
9
10
Converter status monitor
*1
The signal within parentheses ( ) is the initial status. The description changes depending on the setting of
Pr.190 to Pr.195 (Output terminal
function selection)
.
5.7.6
MODBUS RTU communication specification
Operation or parameter setting via communication is possible using the MODBUS RTU communication protocol through RS-
485 terminals on the converter unit.
Item
Instruction
code
Bit
length
Description
Example
Converter
status
monitor
H7A
8 bits
b0: RDB (Inverter operation enable
(NC contact))
b1: Fixed to 0
b2: Fixed to 0
b3: RDA (Inverter operation enable
(NO contact))
b4: RSO (Inverter reset)
b5: IPF (Instantaneous power failure/
undervoltage)
b6: FAN (Fan fault output)
b7: ABC1 (Fault)
Converter
status
monitor
(extended)
H79
16 bits
b0: RDB (Inverter operation enable
(NC contact))
b1: Fixed to 0
b2: Fixed to 0
b3: RDA (Inverter operation enable
(NO contact))
b4: RSO (Inverter reset)
b5: IPF (Instantaneous power failure/
undervoltage)
b6: FAN (Fan fault output)
b7: ABC1 (Fault)
b8 to b14: —
b15: Fault occurrence
0
0
0
0
0
0
0
1
b7
b0
[Example 1] H01...Inverter operation
enable signal (NC contact) ON
[Example 2] H80...Fault occurrence
1
0
0
0
0
0
0
0
b7
b0
0
0
0
0
0
0
0
1
b0
0
0
0
0
0
0
0
0
b15
[Example 1] H0001...Inverter operation enable signal (NC contact) ON
1
0
0
0
0
0
0
0
b0
1
0
0
0
0
0
0
0
b15
[Example 2] H8080...Fault occurrence
Pr.
Name
Initial
value
Setting
range
Description
331
N030
RS-485 communication
station number
0
0
Broadcast communication
1 to 247
Specify the converter unit station number.
Set the converter unit station numbers when two or more converter
units are connected to one personal computer.
332
N031
RS-485 communication
speed
96
3, 6, 12, 24,
48, 96, 192,
384, 576,
768, 1152
Select the communication speed.
The setting value × 100 equals the communication speed.
For example, enter 96 to set the communication speed of 9600 bps.
334
N034
RS-485 communication parity
check selection
2
0
Parity check disabled.
Stop bit length: 2 bits.
1
Parity check (odd parity) enabled.
Stop bit length: 1 bit.
2
Parity check (even parity) enabled.
Stop bit length: 1 bit.
343
N080
Communication error count
0
—
Displays the communication error count during MODBUS RTU
communication. Read-only.
539
N002
MODBUS RTU
communication check time
interval
9999
0
The MODBUS RTU communication is available, but a communication
error occurs.
0.1 to 999.8 s
Set the interval of the communication check (signal loss detection)
time (Same specifications as
Pr.122
)
9999
No communication check (signal loss detection)
549
N000
Protocol selection
0
0
Mitsubishi inverter protocol (computer link)
1
MODBUS RTU protocol
