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• Communication operation presence/absence (with/without) and data format type (A to F) are as follows.
Symbol
Communication request is sent to the converter unit in
a
accordance with the user program in the computer.
b
Converter unit data processing time
Reply data from the converter unit (Data
c
(a) is checked for an error.)
d
Computer processing delay time
Reply from computer in response to reply
e
data c
(Data c is checked for error.)
*1
In the communication request data from the computer to the converter unit, the time of 10 ms or more is also required after an acknowledgment
(ACK) signal showing "No data error detected" is sent. (Refer to
*2
Reply from the converter unit to the converter reset request can be selected. (Refer to
• Data writing format
a. Communication request data from the computer to the converter unit
Format
1
2
Converter
ENQ
unit station
A
*1
number
Converter
ENQ
unit station
A1
*1
number
c. Reply data from the converter unit to the computer (No data error detected)
Number of characters
Format
1
2
Inverter
ACK
station
C
*1
number
c. Reply data from the converter unit to the computer (Data error detected)
Format
D
NAK
*1
Indicates a control code.
*2
Specifies the converter unit station numbers in the range of H00 to H1F (stations 0 to 31) in hexadecimal.
*3
Set the delay time. When Pr.123 PU communication waiting time setting or Pr.337 RS-485 communication waiting time setting is set to
other than "9999", create the communication request data without "delay time" in the data format. (The number of characters decreases by 1.)
*4
CR/LF code: When a computer transmits data to the converter unit, some computers automatically provide either one or both of the codes CR
(carriage return) and LF (line feed) at the end of a data group. In this case, setting must be also made on the converter unit according to the
computer. Use Pr.124 or Pr.341 for the CR+LF code setting.
• Data reading format
a. Communication request data from the computer to the converter unit
Format
B
ENQ
110
5. PARAMETERS
5.7 (N) Communication operation parameters
Operation
No error
(Request accepted)
Error detected
(Request rejected)
No error
(No converter unit
processing)
Error detected
(Converter unit
outputs c again.)
Number of characters
3
4
5
6
Instruction
*3
Data
code
*2
Instruction
*3
Data
code
*2
3
4
*4
*2
Number of characters
1
2
Converter unit station
*1
*2
number
Number of characters
1
2
3
4
Converter unit
*1
Instruction code
*2
station number
Special
monitor
write
A1
With
*1
C
D
10 ms or more
*1
Without
Without
page
113.)
7
8
9
10
11
Sum check
*4
Sum check
3
4
5
*4
Error code
5
6
7
*3
Sum check
Parameter
Converter
Monitor
write
reset
A
A
B
With
Without
With
E, E1,
*2
C
C
E2, E3
*2
D
D
D
Without
Without
Without
(C)
Without
Without
F
page
117.)
12
13
*4
8
9
*4
Parameter
read
B
With
E
D
Without (C)
F
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