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5. PARAMETERS
5.7 (N) Communication operation parameters
• When changing the parameter values frequently, set "1" in
Pr.342 Communication EEPROM write selection
to write
them to the RAM only. The life of the EEPROM will be shorter if parameter write is performed frequently with the setting
unchanged from "0 (initial value)" (EEPROM write).
NOTE
• Turning OFF the converter unit's power supply clears the modified parameter settings when
Pr.342
= "1 (write only to RAM)".
Therefore, the parameter values at next power-ON are the values last stored in EEPROM.
• The parameter setting written in RAM cannot be checked on the operation panel. (The values displayed on the operation panel
are the ones stored in EEPROM.)
5.7.4
Initial settings and specifications of RS-485
communication
Use the following parameters to perform required settings for RS-485 communication between the converter unit and a
personal computer.
• Use the PU connector on the converter unit or RS-485 terminals as communication interface.
• Parameter setting, monitoring, etc. can be performed using Mitsubishi inverter protocol or MODBUS RTU communication
protocol.
• To make communication between the personal computer and converter unit, setting of the communication specifications
must be made to the converter unit in advance. Data communication cannot be made if the initial settings are not made or
if there is any setting error.
