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336
Communication operation and setting
(3) Communication operation presence/absence and data format types
⋅ Data communication between the computer and inverter is made in ASCII code (hexadecimal code).
⋅ Communication operation presence/absence and data format types are as follows:
1)Communication request data from the computer to the inverter
3)Reply data from the inverter to the computer
⋅ When data is written
⋅ When data is read
5)Send data from the computer to the inverter during data read
*1 Indicate a control code
*2 Specify the inverter station numbers between H00 and H1F (stations 0 to 31) in hexadecimal.
*3 When Pr. 123, Pr. 337 (waiting time setting) ≠ "9999", create the communication request data without "waiting time" in the data format. (The number
of characters decreases by 1.)
*4 CR, LF code
When data is transmitted from the computer to the inverter, CR (carriage return) and LF (line feed) codes are automatically set at the end of a data
group on some computers. In this case, setting must also be made on the inverter according to the computer. Whether the CR and LF codes will
be present or absent can be selected using Pr. 124 or Pr. 341 (CR, LF presence/absence selection).
Symbol
Operation
Run
Command
Running
Frequency
Parameter
Write
Inverter
Reset
Monitor
Parameter
Read
1)
Communication request is sent to the
inverter in accordance with the user
program in the computer.
A
A’
AA ABB
2)
Inverter data processing time Present Present Present Absent
Present
Present
3)
Reply data from the
inverter (Data 1) is
checked for error)
No error
*1
(Request accepted)
CC C C *2
E
E’
E
With error.
(Request rejected)
DD D D *2 DD
4)
Computer processing delay time 10ms or more
5)
Answer from computer in
response to reply data 3)
(Data 3) is checked for
error)
No error
*1
(No inverter
processing)
Absent Absent Absent Absent
Absent
(C)
Absent
(C)
With error
(Inverter re-
outputs 3))
Absent Absent Absent Absent F F
*1 In the communication request data from the computer to the inverter, 10ms or more is also required after "no data error (ACK)". (Refer to page
337)
*2 The inverter response to the inverter reset request can be selected. (Refer to page 342)
Format
Number of Characters
1 2 3 4 5 6 7 8 9 10 11 12 13
A
(Data write)
ENQ
*1
Inverter station
number
*2
Instruction code
Waiting
time
*3
Data Sum check
*4
A'
(Data write)
ENQ
*1
Inverter station
number
*2
Instruction code
Waiting
time
*3
Data Sum check
*4
B
(Data read)
ENQ
*1
Inverter station
number
*2
Instruction code
Waiting
time
*3
Sum check
*4
Format
Number of Characters
1 2 3 4 5
C
(No data error detected)
ACK
*1
Inverter station
number
*2
*4
D
(Data error detected)
NAK
*1
Inverter station
number
*2
Error
Code
*4
Format
Number of Characters
1 2 3 4 5 6 7 8 9 10 11
E
(No data error detected)
STX
*1
Inverter station
number
*2
Read data
ETX
*1
Sum check
*4
E'
(No data error detected)
STX
*1
Inverter station
number
*2
Read data
ETX
*1
Sum check
*4
D
(Data error detected)
NAK
*1
Inverter station
number
*2
Error
Code
*4
Format
Number of Characters
1 2 3 4
C
(No data error detected)
ACK
*1
Inverter station
number
*2
*4
F
(Data error detected)
NAK
*1
Inverter station
number
*2
*4