Toshiba VF-AS1 Transmission format for inter-drive communication, INV-NO 1 byte Inverter number

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6.2. Transmission format for inter-drive communication

Data type is handled in hexadecimal notation and the transmission characters are treated with the binary (HEX) code.

The transmission format is basically the same to the case of binary mode. S command is used and the slave inverters do not return the data.

„Master inverter → Slave inverter (Binary mode)

Omissible

(3.5bytes	“/”	INV-NO	CMD		Communication No.	DATA	SUM	(3.5bytes
Blank)	(2FH)	1 byte	1 byte		2 bytes	2 bytes	1 byte	Blank)
				Checksum area			Not omissible
1) INV-NO (1 byte)		: Inverter number

		This is always excluded at the master inverter side at time of inter-drive communication, and
		can be added when the user utilize this data for the purpose of proportional operation.
		(When this code is added, only the inverter concerned will accept the data.)
2)	CMD (1 byte)	: Command
		53H(“S”) or 73(“s”) command ... command for inter-drive communication
		When the master inverter is not tripping, this will be 53H(“S”).
		When the master inverter is tripping, this will be 73H(“s”).
3)	Communication number (2 bytes) :
		Specify “FA01” for two-wire RS485 communication.
		Specify “FA05” for four-wire RS485 communication.
4)	DATA (2 bytes)	: Data of frequency command value.
		(0000H to FFFFH (no range check))

As for the S command, see section 4.2 “Commands”, and see chapter “6 Inter-drive communication function” for the communication of inverters.

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