Hitachi SJ300 Series Size, Size, Code, Value, Value, Element, Element, Description, Description, Status A Definition, Status B Definition, Status C Definition

B–10

Communications Protocol

Command – 04 The 04 command reads the status of the inverter. The frame format of command 04 follows the diagrams and specification tables. The transmit frame has no data field.

Transmit frame format

STX Node Command BCC [CR]

	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
B	Command	Transmission command	2 bytes		04
Appendix
	[CR]	Control code (carriage return)	1 byte		[CR] (0x0D)
	BCC	Block check sum code	2 bytes		Exclusive OR of Node,
					Command, and Data
	The receive frame has an 8-byte data field,			Receive frame format
	containing values for three trip items (plus a
	reserved field).			STX	Node	Data	BCC	[CR]
	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
	Data	Transmission data	8 bytes		(see next table)
	BCC	Block check sum code	2 bytes		Exclusive OR of Node,
					Command, and Data
	[CR]	Control code (carriage return)	1 byte		[CR] (0x0D)

Trip data is organized as shown. The			Data field contents
table below lists the codes and their
meanings.			Status A	Status B		Status C	(reserved)
Code	Status A Definition	Status B Definition				Status C Definition
00	Initial status	On stopping				—
01	—	On running			Stop
02	On Stopping	On tripping			Deceleration speed
03	On running		—		Constant speed
04	On free-run stop		—		Acceleration speed
05	On jog		—		Forward
06	On dynamic braking		—		Reverse
07	On retry		—		Reverse from forward
08	On trip		—		Forward from reverse
09	On under-voltage		—		Forward start
10	—		—		Reverse start