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5. PARAMETERS
5.12 (N) Operation via communication and its settings
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5.12.4 Initial settings and specifications of RS-485
communication
Use the following parameters to perform required settings for the RS-485 communication between the inverter and a personal
computer.
• Use the PU connector on the inverter or RS-485 terminals as communication interface.
• The Mitsubishi inverter protocol, MODBUS-RTU protocol, or BACnet protocol is used. Parameter setting, monitoring, etc.
can be performed through communication.
• To make communication between the personal computer and inverter, setting of the communication specifications must
be made to the inverter in advance. Data communication cannot be made if the initial settings are not made or if there is
any setting error.
[Parameters related to PU connector communication]
Pr. Name Initial
value
Setting range Description
117
N020
PU communication
station number
0 0 to 31 Use this parameter to specify the inverter station number.
Set the inverter station numbers when two or more inverters are
connected to one personal computer.
118
N021
PU communication speed 192 48, 96, 192,
384, 576, 768,
1152
Set the communication speed.
The setting value ï‚´ 100 equals the communication speed.
For example, if 192 is set, the communication speed is 19200 bps.
N022 PU communication data
length
0 0 Data length 8 bits
1 Data length 7 bits
N023 PU communication stop
bit length
1 0 Stop bit length 1 bit
1 Stop bit length 2 bits
119 PU communication stop
bit length / data length
1 0 Stop bit length 1 bit Data length 8 bits
1 Stop bit length 2 bits
10 Stop bit length 1 bit Data length 7 bits
11 Stop bit length 2 bits
120
N024
PU communication parity
check
2 0 Parity check disabled.
1 Parity check (odd parity) enabled.
2 Parity check (even parity) enabled.
121
N025
Number of PU
communication retries
1 0 to 10 Set the permissible number of retries for unsuccessful data
reception. If the number of consecutive errors exceeds the
permissible value, the inverter will trip.
9999 If a communication error occurs, the inverter will not trip.
122
N026
PU communication check
time interval
9999 0 No PU connector communication
0.1 to 999.8 s Set the interval of the communication check (signal loss detection)
time.
If a no-communication state persists for longer than the
permissible time, the inverter will trip.
9999 No communication check (signal loss detection)
123
N027
PU communication
waiting time setting
9999 0 to 150 ms Set the time delay between data transmission to the inverter and
the response.
9999 The time delay is not set in this parameter but in communication
data.
Delay time: Number set in the data × 10 ms
124
N028
PU communication CR/LF
selection
1 0 Without CR/LF
1With CR
2With CR/LF
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