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-A700 Instruction Manual

Parameter
6.23.3 Initial settings and specifications of RS-485 communication (Pr. 117 to
Pr. 124, Pr. 331 to Pr. 337, Pr. 341, Pr. 549)
There are two basic types of communications between the inverter and personal computer:
● communication using the PU connector of the inverter
● 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
Pr. No. Name
PU communication
117
station number
PU communication
118
speed
PU communication stop
119
bit length
PU communication
120
parity check
Number of PU
121
communication retries
PU communication
122
check time interval
PU communication
123
waiting time setting
PU communication
124
CR/LF presence/absence
selection
FR-A700 EC
Initial Setting
Description
Value Range
Specify the inverter station number.
Set the inverter station numbers when
0 0–31
two or more inverters are connected
to one personal computer.
Set the communication speed.
The setting value × 100 equals the
48/96/ communication speed.
192
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 permissible number of retries
at occurrence of a data receive error. If
0–10 the number of consecutive errors
exceeds the permissible value, the
1
inverter will come to an alarm stop.
If a communication error occurs, the
9999 inverter will not come to an alarm
stop.
0 No PU connector communication
Set the interval of communication
check time.
If a no-communication state persists
9999 0.1–999.8s
for longer than the permissible time,
the inverter will come to an alarm
stop.
9999 No communication check
Set the waiting time between data
0–150ms transmission to the inverter and
9999
response.
9999 Set with communication data.
0 Without CR/LF
1 1 With CR
2 With CR/LF
Communication operation and setting
Parameters referred to
—
Data length
8bit
7bit
Refer to
Section
6 - 445