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Communication operation and setting
4.19.3 Initial settings and specifications of RS-485 communication
(Pr. 117 to Pr. 124, Pr. 331 to Pr. 337, Pr. 341, Pr. 549)
The following parameters are used to perform required settings for communication between the inverter and
personal computer.
There are two different communications: communication using the PU connector of the inverter and
communication using the RS-485 terminals.
You can perform parameter setting, monitor, etc. using the Mitsubishi inverter protocol (computer link
communication), Modbus-RTU protocol and BACnet MS/TP protocol.
To make communication between the personal computer and inverter, initialization of the communication
specifications must be made to the inverter.
Data communication cannot be made if the initial settings are not made or there is any setting error.
[PU connector communication related parameter]
Parameter
Number
PU communication station
117
number
118
PU communication speed
PU communication stop bit
119
length
PU communication parity
120
check
Number of PU
121
communication retries
PU communication check
122
time interval
PU communication waiting
123
time setting
PU communication CR/LF
124
selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 192)
216
Name
Initial Value
0
192
1
2
1
9999
9999
1
Setting Range
Specifies the inverter station number.
Set the inverter station numbers when two or
0 to 31
more inverters are connected to one personal
computer.
Set the communication speed.
The setting value × 100 equals the
48, 96, 192, 384
communication speed.
For example, the communication speed is
19200bps when the setting value is "192".
Stop bit length
0
1
2 bits
10
11
2 bits
0
Without parity check
1
With odd parity check
2
With even parity check
Set the permissible number of retries at
occurrence of a data receive error. If the
0 to 10
number of consecutive errors exceeds the
permissible value, the inverter trips.
If a communication error occurs, the inverter
9999
will not come to trip.
0
No PU connector communication
Set the interval of communication check time.
If a no-communication state persists for
0.1 to 999.8s
longer than the permissible time, the inverter
trips.
9999
No communication check
Set
the
0 to 150ms
transmission to the inverter and response.
9999
Set with communication data.
0
Without CR/LF
1
With CR
2
With CR/LF
Description
Data length
1 bit
8 bits
1 bit
7 bits
waiting
time
between
data
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