Communication Specifications; Communication Procedure - Mitsubishi Electric FR-CS84-012 Instruction Manual

 Communication specifications
• The communication specifications are given below.
Item
Communication protocol
Conforming standard
Number of connectable units
Communica
PU connector
tion speed
Control procedure
Communication method
Character system
Start bit
Communica
Stop bit length
tion
specificatio
Parity check
ns
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).
170
5. PARAMETERS
5.11 (N) Communication operation parameters
Mitsubishi protocol (computer link)
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
Asynchronous method
Half-duplex system
ASCII (7 bits or 8 bits can be selected.)
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
Related parameter
Pr.551
̶
Pr.117
Pr.118
̶
̶
Pr.119
̶
Pr.119
Pr.120
̶
Pr.124
Pr.123
Time