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Field
Byte
format
0
SOH
SOH
1
Station
0 to 3，9
address
2
0 to 9
3
ENQ
ENQ
4
Command
R
W
A
E
5
Function
code group *1
6
Function
0 to 9
code
identification
7
0 to 9
number *1
8
Special
SP
additional data
9
Data
0 to 9,
A to F
10
11
12
13
ETX
ETX
14
BCC
0 to 9,
A to F
15
*1 A space (SP = 20
H
*2 Use high-speed response selecting to read the monitor when a command, which takes time for
selecting (see Table 4.13 in Section 4.2 "Host Side Procedures"), is written. The inverter does not
respond to the regular write command W until writing is completed. With regard to high-speed
response command A, the inverter sends back response upon receipt of a write request and
communications can, therefore, continue even during writing. To confirm whether writing is
completed in this case, read the BUSY flag (M14: 15 bits). If additional writing is performed during
writing, NAK (error during writing) will result.
*3 Function codes are divided into function codes that can be edited from the keypad of the inverter,
and communications dedicated function codes.
1) Function codes editable from the keypad
Fundamental functions:
Extension terminal functions: E code
Control functions:
Motor 1 parameters:
High performance functions:
and others
For the contents of function codes, see Chapter 2, Section 2.4 "Making RS-485-related
Settings" and the FRENIC-HVAC/AQUA User's Manual.
Table 4.2 Request frame
Value
ASCII
Hexadecimal
format
01
Start of message
H
30
to 33
Station address of the inverter (decimal: ten's figure)
H
H
39
H
30
to 39
Station address of the inverter (decimal: one's figure)
H
H
05
Transmission request
H
Request command
52
H
57
H
41
H
45
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
30
to 39
Data's first character (hexadecimal: thousand's figure)
H
H
41
to 46
H
H
Data's second character (hexadecimal: hundred's
figure)
Data's third character (hexadecimal: ten's figure)
Data's fourth character (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)
) will be set for an alarm reset command.
F code
C code
P code
H code
4-3
Description
Polling (read)
Selecting (write)
High-speed response selecting (write) *2
Alarm reset
4.1 Messages
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