Mitsubishi Electric FR-F800 Series Instruction Manual page 508

5.12.5 Mitsubishi inverter protocol (computer link
Parameter setting and monitoring, etc. are possible by using the Mitsubishi inverter protocol (computer link communication) via
inverter PU connector and the RS-485 terminals.
 Communication specifications
• The communication specifications are shown in the following table.
Item
Communication protocol
Conforming standard
Number of connectable units
Communication
speed
Control procedure
Communication method
Communication
specifications
Time delay setting
 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) Communication waiting time
(c) The inverter sends reply data to the computer in response to the computer request.
(d) 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.)
*1 If a data error is detected and a retry must be made, perform retry operation with the user program. The inverter output is shut off if the number
of consecutive retries exceeds the parameter setting.
*2 On receipt of a data error occurrence, the inverter returns reply data (c) to the computer again. The inverter output is shut off if the number of
consecutive data errors reaches or exceeds the parameter setting.
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communication)
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.
PU connector Selected among 4800/9600/19200/38400/57600/76800/115200 bps.
Selected among 300/600/1200/2400/4800/9600/19200/38400/57600/76800/
RS-485 terminals
115200 bps.
Asynchronous method
Half-duplex system
Character system ASCII (7 bits or 8 bits can be selected.)
Start bit 1 bit
Stop bit length 1 bit or 2 bits can be selected.
Parity check Check (at even or odd numbers) or no check can be selected.
Error check Sum code check
Terminator CR/LF (whether or not to use it can be selected)
Availability of the setting is selectable.
Computer
↓ (Data flow)
Inverter
Inverter
↓ (Data flow)
Computer
search engine
Description
When data is read
∗2
a
b c
∗1
When data is written
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
d e
Time
5. PARAMETERS
5.12 (N) Communication operation parameters
1
2
3
Related
parameter
4
5
6
7
8
9
10
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