9-15
9-4-5 Standard Frame
The ASCII code character method is employed. A standard frame has a fixed length of 16 bytes.
Using optional frames (12 bytes or 8 bytes), the transmission speed can be increased.
HostInverter frame
Note: Numbers with "H" at the end indicate hexadecimals.
7(6) 0
0
Start-of-heading character (SOH)
← Fixed to 01H.
1
Tens digit of station address (ASCII)
2
Units digit of station address (ASCII)
Designate a station address of the destination
inverter with 01 to 31 or 99. (ASCII designation
of each digit)
3
Enquiry character (ENQ)
←Fixed to 05H.
4
Command type character (ASCII)
←E: Reset command, R: Polling (reading), W:
Selecting (writing)
5
Function type character (ASCII)
← "S", "M", "F", "E", "C", "P", "H" or "A" is
designated.
6
Tens digit of function number (ASCII)
7
Units digit of function number (ASCII)
Designate a function number using a two-digit
number. (Designate each digit of 00 to 46 in
ASCII.)
8
Space (ASCII)
←Fixed to 20H
9
First character of data (ASCII)
10
Second character of data (ASCII)
11
Third character of data (ASCII)
12
Fourth character of data (ASCII)
The data corresponding to the function is
converted into a 4-digit hexadecimal, and
each digit is designated in ASCII.
13
End-of-text character (ETX)
← Fixed to 03H
14
Upper digit of checksum (ASCII)
15
Lower digit of checksum (ASCII)
From tens digit of the station address to ETX
are added in a binary and the lower two digits
of it in hexadecimal notation are stored in
ASCII as a checksum.
InverterHost frame
7(6) 0
0
Start-of-heading character (SOH)
← Fixed to 01H
1
Tens digit of station address (ASCII)
2
Units digit of station address (ASCII)
Station address of responding inverter (01 to
31) (ASCII designation of each digit)
3
Response character (ACK/NAK)
← 06H: Normal response (ACK), 15H: Faulty
response (NAK)
4
Command type character (ASCII)
← E: Reset command, R: Polling (reading), W:
Selecting (writing)
5
Function type character (ASCII)
← "S", "M", "F", "E", "C", "P", "H" or "A" is
responded (the character transmitted by the
host is returned).
6
Tens digit of function number (ASCII)
7
Units digit of function number (ASCII)
The function number is designated in a
two-digit number. (The number sent by the
host is returned.)
8
Special additional data (ASCII)
← Space (20H) or "-" (2DH)
9
First character of data / space (ASCII)
10
Second character of data / space (ASCII)
11
Third character of data / tens digit of error
code (ASCII)
12
Fourth character of data / units digit of error
code (ASCII)
The data sent by the host is returned in
normal response, or an error code is returned
upon an error.
13
End-of-text character (ETX)
← Fixed to 03H
14
Upper digit of checksum (ASCII)
15
Lower digit of checksum (ASCII)
From tens digit of the station address to ETX
are added in a binary and the lower two digits
of it in hexadecimal notation are stored in
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