Toshiba TOSVERT VF-AS1 Instruction Manual page 185

2) 4-wire RS485
The RS485 device (4-wire) 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 RS485 device (4-wire) on the control terminal board is used to connect to other
inverters.
Transmission specifications
Interface
Transmission path
specification
Wiring type
Transmission distance
Number of connectable
units
Synchronization scheme
Transmission rate
Character transmission
Stop bit length
Error detection
Error correction
Response monitoring
Character transmission
6
format
Transmission waiting time
setting
Others
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:
Host computer
INV
No.00
"Given away" : Only the inverter with the selected inverter number conducts data processing. All other inverters,
(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.
Item
Compliant with RS485
Half-duplex type [Buss type (terminator resistor required at each end of system)]
Default setting:4-wire
Up to 500m (overall length of the cable)
Up to 32 units (including the host computer)
Number of inverters that can be connected in a system: Up to 32 units
Asynchronous
Default: 9600 baud (parameter setting)
Selectable from 9600/19200/38400 baud
ASCII mode : JIS X 0201 8-bit (ASCII)
Binary code : Binary, 8-bit (fixed)
Inverter receiving: 1 bit, Inverter sending: 2 bits
Parity: Even, Odd, or None selectable by parameter setting; check sum method
Not provided
Not provided
Reception: 11 bit, Sending: 12 bit (with parity)
Possible
Inverter's action at the occurrence of a communication timeout selectable from
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
INV INV
Given Given
No.01 No.02
away away
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.
Specifications
(parameter setting) 2-wire type/4-wire type selectable
: Wiring
: Data
: Response data (INV → host)
INV
Given
No.03
away
F-78
E6581301
(host → INV)
INV INV
Given Given
No.29 No.30
away away