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Communication specifications
• The communication specifications are shown in the following table.
Item
Communication protocol
Conforming standard
Number of connectable units
PU connector
Communication
speed
RS-485 terminals
Control procedure
Communication method
Character system ASCII (selectable between 7 bits and 8 bits)
Start bit
Stop bit length
Communication
specifications
Parity check
Error check
Terminator
Time delay setting
Communication procedure
• Data communication between the computer and converter unit is made in the following procedure.
(a)
Request data is sent from the computer to the converter unit. (The converter unit will not send data unless requested.)
(b)
Communication delay time
(c)
Reply data: sent from the converter unit to the computer in response to the computer request (data a)
(d)
Converter unit data processing time
(e)
Answer data: sent from the computer in response to the reply data sent from the converter unit (data c) (Subsequent communication is
made properly even without data e.)
*1
If a data error is detected and a retry must be made, perform retry operation with the user program. The converter unit output is shut off if the
number of consecutive retries exceeds the parameter setting.
*2
On receipt of a data error occurrence, the converter unit returns reply data (data c) to the computer again. The converter unit output is shut off if
the number of consecutive data errors reaches or exceeds the parameter setting.
Communication operation presence/absence and data format types
• Data communication between the computer and converter unit is made in ASCII code (hexadecimal code).
Mitsubishi inverter protocol (computer link communication)
EIA-485 (RS-485)
1: N (maximum 32 units), the setting range of station number is 0 to 31.
Selected among 4800/9600/19200/38400 bps
Selected among 300/600/1200/2400/4800/9600/19200/38400/57600/76800/
115200 bps
Asynchronous method
Half-duplex system
1 bit
Selectable between 1 bit and 2 bits
Selectable between enabled (even or odd) or disabled
Sum code check
CR/LF (Selectable between enabled (either or both) or disabled)
Selectable between enabled or disabled
Computer
↓ (Data flow)
Converter unit
a
Converter unit
∗1
↓ (Data flow)
When data is written
Computer
Description
When data is read
∗2
d
e
b
c
5.7 (N) Communication operation parameters
Related
parameter
Pr.551
—
Pr.117
Pr.331
Pr.118
Pr.332
—
—
Pr.119
Pr.333
—
Pr.119
Pr.333
Pr.120
Pr.334
—
Pr.124
Pr.341
Pr.123
Pr.337
Time
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
121
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