Standard Frame - IMO VXSM75-1 Instruction Manual

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