Communication operation and setting
Initial settings and specifications of RS-485 communication (Pr. 117 to
Pr. 120, Pr. 123, Pr. 124, Pr. 549)
Used to perform required settings for RS-485 communication between the inverter and personal
computer. Use PU connector of the inverter for communication.
● You can perform parameter setting, monitoring, etc. using Mitsubishi inverter protocol or
● 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
Pr. No. Name
PU communication stop
waiting time setting
The above parameters can be set when Pr. 160 "User group read selection" = 0.
When "1" (Modbus-RTU protocol) is set in Pr. 549, the setting range within parenthesis is
Always reset the inverter after making the initial settings of the parameters. After you have
changed the communication-related parameters, communication cannot be made until the
inverter is reset.
6 - 226
Specify the inverter station number.
Set the inverter station numbers
when two or more inverters are
connected to one personal compu-
Set the communication speed.
The setting value × 100 equals the
For example, the communication
speed is 19200bps when the set-
ting value is "192".
Stop bit length
Without parity check
With odd parity check
With even parity check
Set the waiting time between data
transmission to the inverter and
Set with communication data.
Mitsubishi inverter (computer link
Parameters referred to