Mitsubishi Electric 800 Series Instruction Manual page 484

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
117 PU communication
N020 station number
118 PU communication speed
N021
N022 PU communication data
length
N023 PU communication stop
bit length
119 PU communication stop
bit length / data length
120 PU communication parity
N024 check
121 Number of PU
N025 communication retries
122 PU communication check
N026 time interval
123 PU communication
N027 waiting time setting
124 PU communication CR/LF
N028 selection
Initial Setting range
value
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.
192 48, 96, 192, Set the communication speed.
The setting value  100 equals the communication speed.
384, 576, 768,
1152 For example, if 192 is set, the communication speed is 19200 bps.
0 0 Data length 8 bits
1 Data length 7 bits
1 0 Stop bit length 1 bit
1 Stop bit length 2 bits
1 0 Stop bit length 1 bit
1 Stop bit length 2 bits
10 Stop bit length 1 bit
11 Stop bit length 2 bits
2 0 Parity check disabled.
1 Parity check (odd parity) enabled.
2 Parity check (even parity) enabled.
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.
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)
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
1 0 Without CR/LF
1 With CR
2 With CR/LF
Description
Data length 8 bits
Data length 7 bits
5.12 (N) Operation via communication and its settings
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5. PARAMETERS