Fuji Electric FRENIC-AQUA series User Manual page 69

4.1.2 Transmission frames
Transmission frames are classified into two types; standard fames with which all
communications
communications, but whose function is limited to issuing commands to and monitoring the
inverter.
All characters (including BCC) comprising both standard and optional frames are represented by
ASCII codes. The lengths of standard and optional frames are as shown in Table 4.1 below:
Standard frame
Optional frame
[ 1 ] Standard frame
Standard frames are classified into request frame, ACK frame, and NAK frame, and their frame
configurations are as shown below.
For the meanings of the fields comprising each frame, see the tables shown on the pages that
follow.
Request frame [host ⇒ inverter]
0 1 2 3
SOH Station ENQ
address
1 2 1
ACK frame [inverter ⇒ host]
0 1 2 3
SOH Station ACK
address
1 2 1
NAK frame [inverter ⇒ host]
0 1 2 3
SOH Station NAK
address
1 2 1
functions are available,
Table 4.1 Lengths of transmission frames
Frame type
Selecting
Polling
Selecting
Polling
4 5
Command Function
code group
1 1
For BCC
4 5
Command Function
code group
1 1
For BCC
4 5
Command Function
code group
1 1
For BCC
and optional frames,
Frame length
Request 16 bytes
Response 16 bytes
Request 16 bytes
Response 16 bytes
Request 12 bytes
Response 8 bytes
Request 8 bytes
Response 12 bytes
6 7 8
Function code SP
identification
number
2 1
6 7 8
Function code SP
identification
number
2 1
6 7 8 9
Function code SP
identification
number
2 1
4-2
allowing high-speed
9 12 13 14 15
Data ETX BCC
4 1
(byte)
9 12 13 14 15
Data ETX BCC
4 1
(byte)
12 13 14 15
Data ETX BCC
4 1
(byte)
2
2
2