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7-4 Serial Communication Function
2) Message from inverter to computer (ASCII format)
Fixed length Variable length
Item Name Content
①
HD Start code Message transmission start code(―*‖
：
ASCII code 2AH)
②③
IN Inverter No.
Inverter number. Data format: 2 bytes fixed
The inverter number is set by function code F4006
Example: inverter number 20
② →―2‖, ③ →―0‖
④
OP Command code
Same as command code from computer
‖?‖ for error response
⑤
DT Data
Example: Function code data read
1
）
When reading a positive, the data is 5 bytes long (fixed).
Example: when reading data 123
(1)→―0‖ (2)→―0‖ (3)→―1‖ (4)→―2‖ (5)→―3‖
Example: When no data is read, normal end code will be
(1)→―e‖ (2)→―F‖ (3)→―F‖ (4)→―F‖ (5)→―0‖
2
）
During response error, an error code or interference code of 5 bytes long (fixed)
is returned.
⑤
Data area
◎
The data length and format are determined by each command. For details, please
refer to Details of message formation.
⑥
SUM Checksum
Obtain the 2‘s complement of the lowest byte of the binary sum of data
①
-
⑤
. Change
bit 7 to 0 and bit 6 to 1. (See reference 1.)
⑦⑧
or
⑦
EM End code
The code to end data transmission. Please determine it according to function code
F4010. ASCII code 0DH(―CR‖) and 0AH(―LF‖) or 0DH(―CR‖)
※
The following messages are used for commands N and B for signed function codes:
In F1402: gain frequency (VIF1) with signed 10 multiples data format, the example is as follows:
〈
Command N
〉
Example 1) When s50.00Hz for F1402
The data (DT) written is: or .
Example 2) When setting -50.00Hz for F1402
The data (DT) written is: .
〈
Command B
〉
Example 3) When s50.00Hz for F1402
The data (DT) read is: .
Example 4) When setting -50.00Hz for F1402
The data (DT) read is: .