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Communication operation and setting
4.18.2 Initial settings and specifications of RS-485 communication
(Pr.117 to Pr.120, Pr.123, Pr.124, Pr.549)
Used to perform required settings for RS-485 communication between the drive unit and personal computer.
Use PU connector of the drive unit for communication.
You can perform parameter setting, monitoring, etc. using Mitsubishi inverter protocol or Modbus-RTU protocol.
To make communication between the personal computer and drive unit, initialization of the communication
specifications must be made to the drive unit.
Data communication cannot be made if the initial settings are not made or there is any setting error.
Parameter
number
Name
Initial
value
Setting range Description
117
PU communication
station number
0
0 to 31
(0 to 247)
Drive unit station number specification
Set the drive unit station numbers when two or more
drive units are connected to one personal computer.
118 PU communication speed
192 48, 96, 192, 384
Communication speed
The setting value 100 equals the communication
speed.
Example)19200bps if 192
119
PU communication stop
bit length
1
Stop bit length Data length
01 bit
8 bit
12 bit
10 1 bit
7 bit
11 2 bit
120
PU communication parity
check
2
0 Without parity check
1 Without parity check
2 With even parity check
123
PU communication
waiting time
9999
0 to 150ms
Set the waiting time between data transmission to
the drive unit and response.
9999 Set with communication data.
124
PU communication CR/LF
selection
1
0 Without CR/LF
1With CR
2With CR/LF
549 Protocol selection
0
0 Mitsubishi inverter (computer link operation) protocol
1 Modbus-RTU protocol
The above parameters can be set when Pr.160 Extended function display selection = "0". (Refer to page 182)
When "1" (Modbus-RTU protocol) is set in Pr.549 , the setting range within parenthesis is applied.
NOTE
Always reset the drive unit after making the initial settings of the parameters. After you have changed the
communication-related parameters, communication cannot be made until the drive unit is reset.