Initial Settings And Specifications Of Rs-485 Communication (Pr. 117 To Pr. 124, Pr. 331 To Pr. 337, Pr. 341, Pr. 549) - Mitsubishi Electric FR-A740-00023 Instruction Manual

Communication operation and setting
4.24.3 Initial settings and specifications of RS-485 communication
(Pr. 117 to Pr. 124, Pr. 331 to Pr. 337, Pr. 341, Pr. 549)
Used to perform required settings for communication between the inverter and personal computer.
There are two different communications: communication using the PU connector of the inverter and
communication using the RS-485 terminals.
You can perform parameter setting, monitor, etc. from the PU connector or RS-485 terminals of the inverter
using the Mitsubishi inverter protocol (computer link communication).
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]
Parameter
Number
PU communication station
117
number
118 PU communication speed
PU communication stop bit
119
length
PU communication parity
120
check
Number of PU
121
communication retries
PU communication check
122
time interval
PU communication waiting
123
time setting
PU communication CR/LF
124
selection
320
Name
Initial Value
0
192
1
2
1
9999
9999
1
Setting Range
Specify the inverter station number.
Set the inverter station numbers when two or
0 to 31
more inverters are connected to one
personal computer.
Set the communication speed.
The setting value × 100 equals the
48, 96, 192, 384 communication speed.
For example, the communication speed is
19200bps when the setting value is "192".
Stop bit length
0
1
10
11
0 Without parity check
1 With odd parity check
2 With even parity check
Set the permissible number of retries at
occurrence of a data receive error. If the
0 to 10 number of consecutive errors exceeds the
permissible value, the inverter will come to
an alarm stop.
If a communication error occurs, the inverter
9999
will not come to an alarm stop.
0 No PU connector communication
Set the interval of communication check
(signal loss detection) time.
0.1 to 999.8s If a no-communication state persists for
longer than the permissible time, the inverter
will come to an alarm stop.
No communication
9999
detection)
Set the
0 to 150ms
transmission to the inverter and response.
9999 Set with communication data.
0 Without CR/LF
1 With CR
2 With CR/LF
Description
Data length
1bit
8bit
2bit
1bit
7bit
2bit
check (signal
waiting time between
loss
data