Mitsubishi Electric FR-A800, Instruction Manual

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(N) Operation via communication and its settings Parameters
5 - 610
5.15.4 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.
●
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 communi-
cation 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
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.
124
N028
PU communication CR/
LF selection
1
0 Without CR/LF
1 With CR
2 With CR/LF