Hitachi SJ300-037HFE 사용자 설명서

SJ300 Inverter

Appendix B

The standard affirmative reply from the inverter 
uses the ACK character (acknowledge) in the data 
field. The frame format of this reply follows the 
diagram and specification table.

The standard negative reply from the inverter 
uses the NAK character (negative acknowl-
edge) in the data field. The frame format of 
this reply follows the diagram and specifica-
tion table.

The error codes for a NAK (negative acknowledge) are:

STX

Control code (STart of TeXt)

1 byte

STX (0x02)

Node

Node (station) address of inverter

2 bytes 01 to 32

ACK

Control code (ACKnowledge)

1 byte

ACK (0x06)

BCC

Block check sum code

2 bytes Exclusive OR of Node and ACK

[CR]

Control code (carriage return)

1 byte

[CR] (0x0D)

STX Node

ACK

BCC [CR]

Frame format

STX

Control code (STart of TeXt)

1 byte

STX (0x02)

Node

Node (station) address of inverter

2 bytes 01 to 32

Data

Error code – reason for negative 
acknowledge

2 bytes (see error codes in next table)

NAK

Control code
(Negative ACKnowledge)

1 byte

NAK (0x15)

Error code

Code representing error type

1 byte

(See next table below)

BCC

Block check sum code

2 bytes Exclusive OR of Node, Data,  

and NAK

[CR]

Control code (carriage return)

1 byte

[CR] (0x0D)

01H

Parity error

07H

Receive buffer overrun error

02H

Check sum error

08H

Receive time-out error

03H

Framing error

11H

Abnormal command code error

04H

Overrun error

13H

Test error code

05H

Protocol error

16H

Abnormal parameter code/value 
error

06H

ASCII code error

—

—

Node

BCC

[CR]

Frame format

STX

NAK

Error
code