Mitsubishi Electric 800 Series, Instruction Manual, Page: 554 / 727

(N) Operation via communication and its settings
PARAMETERS
553
5
GROUP
N
5.15.4
Initial settings and specifications of RS-485
communication
[Parameters related to PU connector communication]
Use the following parameters to perform required settings for the RS-485 communication between the inverter and a
personal computer.
• There are two types of communication, communication using the inverter's PU connector and communication using
the RS-485 terminals.
• Parameter setting, monitoring, etc. can be performed using Mitsubishi inverter protocol and MODBUS RTU
communication protocol.
• 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.
Pr. Name
Initial
value Setting
range
Description
117
N020 PU communication
station number
0 0 to 31
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

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 Without parity check
1 With parity check at odd numbers
2 With parity check at even numbers
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 waiting time between data transmission to the inverter
and the response.
9999
Set with communication data.
Delay time: Number set in the data × 10 ms
124
N028 PU communication CR/
LF selection
1
0 Without CR/LF
1 With CR
2 With CR/LF