Initial Settings And Specifications Of Rs-485 Communication - Mitsubishi Electric FR-F800 Instruction Manual

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.
• 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 with the Mitsubishi inverter protocol, Modbus-RTU protocol,
and BACnet 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.
[Parameters related to PU connector communication]
Pr. Name
117 PU communication
N020 station number
118 PU communication
N021 speed
PU communication
E022
data length
PU communication
E023
stop bit length
PU communication
119 stop bit length / data
length
120 PU communication
N024 parity check
121 Number of PU
N025 communication retries
122 PU communication
N026 check time interval
123 PU communication
N027 waiting time setting
124 PU communication CR/
N028 LF selection
(N) Operation via communication and its settings
Initial Setting
value range
Specify the inverter station number.
0 0 to 31 Set the inverter station numbers when two or more inverters are
connected to one personal computer.
Set the communication speed.
48, 96, 192,
The setting value  100 equals the communication speed.
192 384, 576, 768,
For example, if 192 is set, the communication speed is 19200
1152
bps.
0 Data length 8 bits
0
1 Data length 7 bits
0 Stop bit length 1 bit
1
1 Stop bit length 2 bits
0 Stop bit length 1 bit
1 Stop bit length 2 bits
1
10 Stop bit length 1 bit
11 Stop bit length 2 bits
0 Without parity check
2 1 With parity check at odd numbers
2 With parity check at even numbers
Set the permissible number of retries for unsuccessful data
0 to 10 reception. If the number of consecutive errors exceeds the
1
permissible value, the inverter will trip.
9999 If a communication error occurs, the inverter will not trip.
0 No PU connector communication
Set the interval of the communication check (signal loss
detection) time.
9999 0.1 to 999.8 s
If a no-communication state persists for longer than the
permissible time, the inverter will trip.
9999 No communication check (signal loss detection)
Set the waiting time between data transmission to the inverter
0 to 150 ms
and the response.
9999
9999 Set with communication data.
0 Without CR/LF
1 1 With CR
2 With CR/LF
Description
Data length 8 bits
Data length 7 bits
PARAMETERS
5
GROUP
N
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