Short Frame - IMO VXSM75-1 Instruction Manual

9-4-6 Short Frame

Short frames are prepared for special functions
to reduce the data transmission time.
(1) Selecting
Host¡Inverter (selecting)
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 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)
Inverter¡Host frame (selecting)
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 End-of-text character (ETX)
6 Upper digit of checksum (ASCII)
7 Lower digit of checksum (ASCII)
Specifications
0
Fixed to 01H.
Designate a station address of the destination
inverter with 01 to 31 or 99. (designation of each
character in ASCII)
Fixed to 05H.
"a", "e", "f" or "m" is designated.
The data corresponding to the function 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.
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)
"a", "e", "f" or "m" sent from the host is returned.
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.
9-16