Setting The Communication Protocol (Pr.549); Communication Eeprom Write Selection (Pr.342) - Mitsubishi Electric 800 Series Instruction Manual

Rs-485 interface board, rs-485 communication terminals

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4.3.1

Setting the communication protocol (Pr.549)

• Select the RS-485 communication protocol.

• The MODBUS-RTU protocol is used for communication via the RS-485 terminals on the product.

Pr.549 setting

0 (initial value)

Mitsubishi inverter protocol (computer link)

MODBUS RTU protocol

4.3.2

• When parameter write is performed via the RS-485 terminals on the product, the parameters storage device can be

switched to RAM only from both EEPROM and RAM. Use this function if parameter settings are changed frequently.

• 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 inverter'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.)

PARAMETER

Communication protocol

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