Initial Settings And Specifications Of Rs-485 Communication - Mitsubishi Electric FR-E700 Series Instruction Manual

Communication operation and setting
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
Pr. No. Name
PU communication station
117
number
118
PU communication speed
PU communication stop bit
119
length
120
PU communication parity check
PU communication waiting time
123
setting
PU communication
124
CR/LF presence/absence selec-
tion
549
Protocol selection
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.
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.
6 - 232
Setting
Initial Value Description
Range
Specify the inverter station number.
0–31
Set the inverter station numbers when two or
0
more inverters are connected to one personal
(0–247)
computer.
Set the communication speed.
The setting value × 100 equals the communi-
48/96/
192 cation speed.
192/384
For example, the communication speed is
19200bps when the setting value is "192".
Stop bit length
0 1bit
1
1 2bit
10 1bit
11 2bit
0 Without parity check
2 1 With odd parity check
2 With even parity check
Set the waiting time between data transmis-
0–150ms
sion to the inverter and response.
9999
9999 Set with communication data.
0 Without CR/LF
1 1 With CR
2 With CR/LF
Mitsubishi inverter (computer link operation)
0
protocol
0
1 Modbus-RTU protocol
Parameters referred to
Data length
8bit
7bit
Parameter
Refer to
Section
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