Mitsubishi Electric FR-E740 SC EC Series User Manual

Communication operation and setting Parameter
6 - 232
6.19.2 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 inverter and personal
computer. Use PU connector of the inverter for communication.
● You can perform parameter setting, monitoring, etc. using Mitsubishi inverter protocol or Mod-
bus-RTU protocol.
● To make communication between the personal computer and inverter, initialization of the
communication specifications must be made to the inverter. Data communication cannot be
made if the initial settings are not made or there is any setting error.
PU connector communication related parameter
The above parameters can be set when Pr. 160 "User group read selection" = 0.

When "1" (Modbus-RTU protocol) is set in Pr. 549, the setting range within parenthesis is
applied.
Pr. No. Name Initial Value
Setting
Range
Description Parameters referred to
Refer to
Section
117
PU communication station
number
0
0–31
(0–247)

Specify the inverter station number.
Set the inverter station numbers when two or
more inverters are connected to one personal
computer.
—
118
PU communication speed 192
48/96/
192/384
Set the communication speed.
The setting value × 100 equals the communi-
cation speed.
For example, the communication speed is
19200bps when the setting value is "192".
119
PU communication stop bit
length
1
Stop bit length Data length
01bit
8bit
12bit
10 1bit
7bit
11 2bit
120
PU communication parity check 2
0Without parity check
1 With odd parity check
2 With even parity check
123
PU communication waiting time
setting
9999
0–150ms
Set the waiting time between data transmis-
sion to the inverter and response.
9999 Set with communication data.
124
PU communication
CR/LF presence/absence selec-
tion
1
0 Without CR/LF
1 With CR
2 With CR/LF
549
Protocol selection 0
0
Mitsubishi inverter (computer link operation)
protocol
1 Modbus-RTU protocol
NOTE Always reset the inverter after making the initial settings of the parameters. After you have
changed the communication-related parameters, communication cannot be made until the
inverter is reset.

Mitsubishi Electric FR-E740 SC EC Series Specifications

General

Brand	Mitsubishi Electric
Model	FR-E740 SC EC Series
Category	Inverter
Language	English