Mitsubishi Electric FR-F820-00046 Instruction Manual page 486

 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 (7 bits or 8 bits can be selected.)
Start bit
Stop bit length
Communication
specifications
Parity check
Error check
Terminator
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.
 Communication operation presence/absence and data format types
• Data communication between the computer and inverter 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 4800/9600/19200/38400/57600/76800/115200 bps.
Selected among 300/600/1200/2400/4800/9600/19200/38400/57600/76800/
115200 bps.
Asynchronous method
Half-duplex system
1 bit
1 bit or 2 bits can be selected.
Check (at even or odd numbers) or no check can be selected.
Sum code check
CR/LF (whether or not to use it can be selected)
Availability of the setting is selectable.
Computer
↓ (Data flow)
Inverter a
Inverter
∗1
↓ (Data flow)
Computer
Description
When data is read
∗2
d e
b c
When data is written
5.12 (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
485