Mitsubishi Inverter Protocol; Communication Specifications; Communication Procedure - Mitsubishi Electric FR-XC-18.5K-PWM Instruction Manual

Pr. Name
PU communication waiting
123
time setting
PU communication CR/LF
124
selection
NOTE
• Always reset the converter after making the settings of the parameters. After changing the communication-related
parameters, communication cannot be made until the converter is reset.
3.5.21
Mitsubishi inverter protocol (computer link
communication)
Parameter setting and monitoring, etc. are possible through communication using the Mitsubishi inverter protocol
(computer link communication) via the PU connector on the converter.
Communication specifications
• The communication specifications are given below.
Item
Communication protocol
Conforming standard
Number of connectable units
Communication speed
Control procedure
Communication method
Character system
Start bit
Stop bit length
Communication
specifications
Parity check
Error check
Terminator
Time delay setting
Communication procedure
Computer
↓ (Data flow)
Converter
Converter
∗1
↓ (Data flow)
Computer
∗1
If a data error is detected and a retry must be made, perform retry operation with the user program. The converter stops retrying and outputs the
LF signal when the number of consecutive retries exceeds the parameter setting.
∗2 On receipt of a data error occurrence, the converter returns reply data (data c) to the computer again. The converter stops retrying and outputs
the LF signal when the number of consecutive data errors exceeds the parameter setting.
Initial
value
0 to 150 ms
9999
9999
0
1 1
2
1:N (maximum 32 units), for stations No. 0 to 31
Selected among 4800/9600/19200/38400 bps
Selectable between enabled (even or odd) or disabled
CR/LF (Selectable between enabled (either or both) or disabled)
For data read
∗2
a d e
b c
For data write
Setting range
Set the time delay between data transmission to the
converter and the response.
The time delay is not set in this parameter but in
communication data.
Delay time: Number set in the data × 10 ms
Without CR+LF
With CR
With CR+LF
Description
Mitsubishi inverter protocol (computer link)
EIA-485 (RS-485)
Asynchronous method
Half-duplex system
ASCII (selectable between 7 bits and 8 bits)
1 bit
Selectable between 1 bit and 2 bits
Sum code check
Selectable between enabled or disabled
• In communication between the computer and the
converter, the following data is exchanged in the
order from a to e.
Request data: sent from the computer to the
Time
a
converter (The converter will not send data unless
requested.)
b
Communication delay time
Reply data: sent from the converter to the computer
c
in response to the computer request (data a)
d
Converter data processing time
Answer data: sent from the computer in response to
the reply data sent from the converter (data c)
e
(Subsequent communication is made properly even
without data e.)
Parameter details
Description
Related
parameter
—
—
Pr.117
Pr.118
—
—
Pr.119
—
Pr.119
Pr.120
—
Pr.124
Pr.123
105
PARAMETERS
3