(N) Operation via communication and its settings
PARAMETERS
565
5
GROUP
N
5.15.5 Mitsubishi inverter protocol (computer link
communication)
Communication specifications
• The communication specifications are given below.
Communication procedure
• Data communication between the computer and inverter is made in the following procedure.
(a) Request data is sent from the computer to the inverter. (The inverter will not send data unless requested.)
(b) After waiting for the waiting time,
(c) The inverter sends reply data to the computer in response to the computer request.
(d) After waiting for the inverter data processing time,
(e) An answer from the computer in response to reply data (c) of the inverter is transmitted. (Even if (e) is not sent,
subsequent communication is made properly.)
If a data error is detected and a retry must be made, perform retry operation with the user program. The inverter trips if the number of
consecutive retries exceeds the parameter setting.
On receipt of a data error occurrence, the inverter returns reply data (c) to the computer again. The inverter trips if the number of consecutive
data errors reaches or exceeds the parameter setting.
Parameter settings and monitoring are possible by using the Mitsubishi inverter protocol (computer link communication)
via inverter PU connector and the RS-485 terminals.
Item Description
Related
Parameter
Communication protocol Mitsubishi protocol (computer link) Pr.551
Conforming standard EIA-485 (RS-485)
Connectable units 1:N (maximum 32 units), setting is 0 to 31 stations
Pr.117
Pr.331
Communication
Speed
PU connector Selected among 4800/9600/19200/38400 bps Pr.118
RS-485 terminals
Selected among 300/600/1200/2400/4800/9600/19200/38400/38400/
57600/76800/115200 bps
Pr.332
Control procedure Asynchronous system
Communication method Half-duplex system
Communication
specifications
Character system ASCII (7 bits or 8 bits can be selected.)
Pr.119
Pr.333
Start bit 1 bit
Stop bit length 1 bit or 2 bits can be selected.
Pr.119
Pr.333
Parity check Check (at even or odd numbers) or no check can be selected.
Pr.120
Pr.334
Error check Sum code check
Terminator CR/LF (presence/absence selectable)
Pr.124
Pr.341
Waiting time setting Selectable between presence and absence
Pr.123
Pr.337
When data is read
When data is written
aed
cb
∗1
∗2
Computer
↓ (Data flow)
Inverter
Computer
↓ (Data flow)
Inverter
Time
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