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Byte
Field
ASCII
format
0
SOH
SOH
1
Station
0 to 3
address
2
0 to 9
3
NAK
NAK
4
Command *1
R
W
A
E
5
Function code
group *1
6
Function code
0 to 9
identification
number *1
7
0 to 9
8
Special
SP
additional
data
9
Data
SP
10
SP
11
0 to 9,
A to F
12
13
ETX
ETX
14
BCC
0 to 9,
A to F
15
*1 The field contents of command type, function code group, function code identification number
vary at the format error or command error.
Table 4.4 NAK frame
Value
Hexadecimal
format
01
Start of message
H
30
to 33
Station address of the inverter (decimal: ten's figure)
H
H
30
to 39
Station address of the inverter (decimal: one's figure)
H
H
15
Transmission response
H
Negative acknowledgement: There was a logical error in
the request.
Answerback of request command
52
Polling (read)
H
57
Selecting (write)
H
41
High-speed response selecting (write)
H
45
Alarm reset
H
See Table 4.4-1.
30
to 39
Function code identification number (decimal: ten's
H
H
figure)
30
to 39
Function code identification number (decimal: one's
H
H
figure)
20
Unused (space fixed)
H
20
Unused (space fixed)
H
20
Unused (space fixed)
H
30
to 39
Communications error code higher order (hexadecimal:
H
H
41
to 46
ten's figure)
H
H
Communications error code lower order (hexadecimal:
one's figure)
03
End of message
H
30
to 39
Checksum 1 (hexadecimal: ten's figure)
H
H
41
to 46
H
H
Checksum 2 (hexadecimal: one's figure)
4-5
4.1 Messages
Description
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