Mitsubishi Electric 800 Series Instruction Manual page 520

 Automatic baud rate recognition (Pr.726 Auto Baudrate/Max Master)
• Automatic changing of baud rate is available with Pr.726 setting. When Pr.726="128 to 255", turn the power ON from OFF
or reset the inverter to start automatic baud rate recognition.
Pr.726 setting
0 to 127 Automatic baud rate recognition is invalid.
(The Pr.332 setting is used as the baud rate.)
128 to 255 The inverter monitors the data on the communication bus, and automatically switches
the baud rate.
The recognized baud rate is written to Pr.332.
NOTE
• After the baud rate recognition, the recognized baud rate is written in EEPROM as the Pr.332 setting regardless of the
Pr.342 Communication EEPROM write selection setting.
• The BACnet status monitor displays "1" during automatic baud rate recognition.
• The communication error monitor count is not performed during automatic baud rate recognition.
• During automatic baud rate recognition, the inverter does not transmit data, but only accepts data.
• The baud rate switching operation cannot be finished if the inverter is not connected to the communication bus. (BACnet
protocol will not be established.)
• The baud rate switching operation cannot be finished if the inverter is continuously receiving abnormal data during
automatic baud rate switching. (BACnet protocol will not be established.)
Operation
5.12 (N) Operation via communication and its settings
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5. PARAMETERS