Initial Settings And Specifications Of Rs-485 Communication - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

Pr.79 Operation mode selectionpage 370
Pr.340 Communication startup mode
Pr.335 RS-485 communication retry
Pr.336 RS-485 communication check time
Pr.539 MODBUS RTU communication check time
Pr.550 NET mode operation command source
Pr.551 PU mode operation command source
5.15.4 Initial settings and specifications of RS-485
communication
Use the following parameters to perform required settings for RS-485 communication between the inverter and a personal
computer.
• There are two types of communication, communication using the inverter's PU connector and communication using the
RS-485 terminals.
• Parameter setting, monitoring, etc. can be performed using Mitsubishi inverter protocol or MODBUS RTU communication
protocol.
• To make communication between the personal computer and inverter, setting of the communication specifications must
be made to the inverter in advance. Data communication cannot be made if the initial settings are not made or if there is
any setting error.
 Parameters related to PU connector communication
Pr.
117 PU communication
N020 station number
118 PU communication
N021 speed
PU communication
E022
data length
PU communication
E023
stop bit length
PU communication
119 stop bit length / data
length
120 PU communication
N024 parity check
121 PU communication
N025 retry count
122 PU communication
N026 check time interval
123 PU communication
N027 waiting time setting
124 PU communication CR/
N028 LF selection
636
5. PARAMETERS
5.15 (N) Communication operation parameters
selectionpage 378
countpage 636
intervalpage 636
intervalpage 652
selectionpage 380
selectionpage 380
Name Initial value
0
192
0
1
1
2
1
9999
9999
1
Setting
range
Specify the inverter station number.
0 to 31 Enter the inverter station numbers when two or more inverters are
connected to one personal computer.
48, 96, 192, Select the communication speed.
384, 576, The setting value × 100 equals the communication speed.
768, 1152 For example, enter 192 to set the communication speed of 19200 bps.
0 Data length 8 bits
1 Data length 7 bits
0 Stop bit length 1 bit
1 Stop bit length 2 bits
0 Stop bit length 1 bit
1 Stop bit length 2 bits
10 Stop bit length 1 bit
11 Stop bit length 2 bits
0 Without parity check
1 With parity check at odd numbers
2 With parity check at even numbers
Set the permissible number of retries for unsuccessful data reception.
0 to 10 If the number of consecutive errors exceeds the permissible value, the
inverter output will be stopped.
The inverter output will not be shut off even when a communication
9999
error occurs.
0 PU connector communication is disabled.
Set the interval of the communication check (Signal loss detection)
0.1 to 999.8 time.
s If a no-communication state persists for longer than the permissible
time, the inverter output will be shut off.
9999 No communication check (Signal loss detection)
Set the waiting time between data transmission to the inverter and the
0 to 150 ms
response.
Set with communication data.
9999
Waiting time: setting data × 10 ms
0 Without CR/LF
1 With CR
2 With CR/LF
Description
Data length 8 bits
Data length 7 bits