Hitachi SJ300 Series Inverter Negative Reply, Inverter Affirmative Reply, Size, Size, Code, Code, Value, Value, Error, Error, Element, Element, Description, Description

B–17

SJ300 Inverter

Communications Reference Information

Inverter Affirmative Reply

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.

Frame format

STX Node ACK BCC [CR]

Element	Description	Size	Value
				Appendix
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)	B
BCC	Block check sum code	2 bytes	Exclusive OR of Node and ACK
[CR]	Control code (carriage return)	1 byte	[CR] (0x0D)

Inverter Negative Reply

The standard negative reply from the inverter				Frame format
uses the NAK character (negative acknowl-
edge) in the data field. The frame format of		STX		Node		NAK	Error	BCC	[CR]
							code
this reply follows the diagram and specifica-
tion table.
Element	Description		Size				Value
STX	Control code (STart of TeXt)		1 byte		STX (0x02)
Node	Node (station) address of inverter		2 bytes		01 to 32
NAK	Control code		1 byte		NAK (0x15)
	(Negative ACKnowledge)
Error code	Code representing error type		2 bytes		(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)

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

Error	Error Description	Error	Error Description
Code		Code
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	—	—