• When Pr.502 = "3" and a communication line error occurs, or Pr.502 = "4" and a communication line error or a
communication option fault occurs, the operation continues. When setting "3 or 4" in Pr.502, provide a safety stop
countermeasure other than via communication. For example, input a signal through an external terminal (RES, MRS,
etc.) or press the PU stop on the operation panel.
Parameters referred to
Pr.7 Acceleration time, Pr.8 Deceleration
Pr.335 RS-485 communication retry
Pr.336 RS-485 communication check time
Pr.539 MODBUS RTU communication check time
Pr.550 NET mode operation command source
Pr.551 PU mode operation command source
5.12.4 Initial settings and specifications of RS-485
Use the following parameters to perform required settings for RS-485 communication between the inverter and a personal
• Use the PU connector on the inverter or RS-485 terminals as communication interface.
• The Mitsubishi inverter protocol, MODBUS-RTU protocol, or BACnet protocol is used. Parameter setting, monitoring, etc.
can be performed through communication.
• 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.
5.12 (N) Communication operation parameters