Toshiba VF-AS1 instruction manual ~ ~, Response data INV → host

E6581301

2) 4-wire RS485

The 4-wire RS485 device included as standard equipment, allows you to connect the inverter to a higher-level system (host) and to set up a network for data communications between inverters. It makes it possible for the inverter to be linked to a computer and to carry out data communications with other inverters.

The connector (RJ45) for the 4-wire RS485 device on the control circuit terminal block is used to connect to other inverters.

■Transmission specifications

	Item	Specifications
	Interface	Compliant with RS485
	Transmission path	Half-duplex type [Buss type (terminator resistor required at each end of system)]
	specification
	Wiring type	Compatible with both 4-wire and 2-wire types
	Transmission distance	Up to 500m (overall length of the cable)
	Number of connectable	Up to 32 units (including the host computer)
	units	Number of inverters that can be connected in a system: Up to 32 units
	Synchronization scheme	Asynchronous
	Transmission rate	Default: 19200 baud (parameter setting)
		Selectable from 9600/19200/38400 baud
	Character transmission	ASCII mode : JIS X 0201 8-bit (ASCII)
		Binary code : Binary, 8-bit (fixed)
	Stop bit length	Inverter receiving: 1 bit, Inverter sending: 2 bits
	Error detection	Parity: Even, Odd, or None selectable by parameter setting; check sum method
	Error correction	Not provided
	Response monitoring	Not provided
	Character transmission	Reception: 11 bit, Sending: 12 bit (with parity)
6	format
	Transmission waiting time	Possible
	setting
		Inverter’s action at the occurrence of a communication timeout selectable from
	Others	tripping/raising an alarm/doing nothing
		→When alarm is selected, “￿” blinks at the left end of the operation panel
		When tripping is selected, “￿￿￿￿” is displayed on the operation panel

■Example of the connection of inverters linked to a computer <Independent communication>

Perform computer-inverter connection as follows to send operation frequency commands from the host computer to inverter No. 3:

							: Wiring
							: Data		(host →!INV)
Host computer							: Response data (INV → host)
!		!		!		!	~ ~	!
INV		INV		INV		INV		INV		INV
No.00	Given	No.01	Given	No.02	Given	No.03		No.29	Given	No.30
	away		away		away				away

Given away

“Given away”: Only the inverter with the selected inverter number conducts data processing. All other inverters, even if they have received the data, give it away and stand by to receive the next data.

!: Use the terminal board to branch the cable.

(1)Data is sent from the host computer.

(2)Data from the computer is received at each inverter and the inverter numbers are checked.

(3)The command is decoded and processed only by the inverter with the selected inverter number.

(4)The selected inverter responds by sending the processing results, together with its own inverter number, to the host computer.

(5)As a result, only the selected inverter starts operating in accordance with the operation frequency command by communicating independently.

F-84