Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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Parameters (N) Operation via communication and its settings
FR-A800 5 - 637
5.15.5 Mitsubishi inverter protocol (computer link communication)
Parameter settings and monitoring are possible by using the Mitsubishi inverter protocol (computer
link communication) via inverter PU connector and the RS-485 terminals. Upon delivery the FR-A800-
E inverter models are not equipped with the RS-485 terminal block.
Communication specifications
The communication specifications are given below.
Communication procedure
Data communication between the computer and inverter is made in the following procedure.
Request data is sent from the computer to the inverter. (The inverter will not send data unless
requested.)
After waiting for the waiting time,
The inverter sends reply data to the computer in response to the computer request.
After waiting for the inverter data processing time,
An answer from the computer in response to reply data ( ) of the inverter is transmitted.
(Even if ( ) is not sent, subsequent communication is made properly.)
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
Tab. 5-275: Communication specifications
I002735E
Fig. 5-317: Schematic diagram of data exchange
↓
↓
Time
Computer
(Data flow)
(Data flow)
Computer
Inverter
Inverter
When data is read
When data is written