478
5. PARAMETERS
5.12 (N) Operation via communication and its settings
Two-wire type connection
• If the computer is 2-wire type, a connection from the inverter can be changed to 2-wire type by passing wires across
reception terminals and transmission terminals of the RS-485 terminals.
• A program should be created so that transmission is disabled (receiving state) when the computer is not sending and
reception is disabled (sending state) during sending to prevent the computer from receiving its own data.
5.12.3 Initial setting of operation via communication
Set the action when the inverter is performing operation via communication.
• Set the communication protocol. (Mitsubishi inverter protocol/MODBUS RTU protocol)
• Set the action at fault occurrence or at writing of parameters
*1 The setting is available only when a communication option is installed.
Pr. Name Initial value Setting range Description
549
N000
Protocol selection 0 0 Mitsubishi inverter protocol (computer link)
1 MODBUS RTU protocol
2 BACnet MS/TP protocol
342
N001
Communication EEPROM
write selection
0 0 Parameter values written by communication are written to the
EEPROM and RAM.
1 Parameter values written by communication are written to the
RAM.
349
*1
Communication reset
selection/Ready bit status
selection/Reset selection
after inverter faults are
cleared/DriveControl writing
restriction selection
0 0 Enables the error reset function in any operation mode.
1 Enables the error reset function only in the Network operation
mode.
100, 101 For details, refer to page 641 and page 643.
1000, 1001,
1100, 1101,
10000, 10001,
10100, 10101,
11000, 11001,
11100, 11101
For details, refer to page 641.
N010
*1
Communication reset
selection
0 0 Enables the error reset function in any operation mode.
1 Enables the error reset function only in the Network operation
mode.
N240
*1
Ready bit status selection 0 0 The status of Ready bit in communication data can be
changed.
1
502
N013
Stop mode selection at
communication error
0 0 to 4 Select the operation at a communication error occurrence.
779
N014
Operation frequency during
communication error
9999 0 to 590 Hz Set the frequency to be run at a communication error
occurrence.
9999 The motor runs at the frequency used before the
communication error.
TXD+
TXD-
RXD+
RXD-
SG
SG
InverterComputer
Pass a wire
Transmission
enable
Reception
enable
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