Details Of Frame - IMO VXSM75-1 Instruction Manual

(2) Polling
Host¡Inverter (polling)
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 End-of-text character (ETX)
6 Upper digit of checksum (ASCII)
7 Lower digit of checksum (ASCII)
Inverter¡Host frame (polling)
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 First character of data (ASCII)
6 Second character of data (ASCII)
7 Third character of data (ASCII)
8 Fourth character of data (ASCII)
9 End-of-text character (ETX)
10 Upper digit of checksum (ASCII)
11 Lower digit of checksum (ASCII)

9-4-7 Details of Frame

(1) Start-of-heading character (ASCII; SOH)
01H in binary.
(2) Tens digit and units digit of station address
Two ASCII characters expressing a decimal
station address between 1 and 31.
Example: Station address 1: Tens digit of
station address: ASCII "0", units digit of
station address: ASCII "1"
Station address 31: Tens digit of station
address: ASCII "3", units digit of station
address: ASCII "1"
(3) Enquiry character (ASCII; ENQ) 05H in
binary.
9-17
0
Fixed to 01H.
Designate the station address of the destination
inverter with 01 to 31 or 99. (designation of each
character in ASCII)
Fixed to 05H.
"g", "h", "i", "j" or "k" is designated.
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
Station address of responding inverter (01 to 31)
(designation of each digit in ASCII)
06H: Normal responce (ACK), 15H: Faulty response
(NAK)
"g", "h", "i", "j" or "k" sent from the host is returned.
The data corresponding to the command is
converted into a four-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.
(4) Response character (ASCII; ACK/NAK)
The inverter sets ACK (06H) to recognize a
request.
NAK (15H) is set when the request from the
host includes a logical error.
(5) Command type character
In a standard frame, set "R" in ASCII for a
polling (reading) request, or set "W" in ASCII
for a selecting (writing) request. Set "E" in
ASCII for a resetting command. Only the
upper case characters are valid.
In a short frame, the function is directly
designated using
character. Refer to (3) Short Frame in
section 9-4-11 Function Code List for details.
(6) Function type character and tens digit and
units digit of function number
A request function is designated in three
a command type
Specifications