Using Rs485 Communication; Operation By Rs485 Communication; Transmission Specifications - Toshiba TOSVERT VF-AS3 Instruction Manual

6. 38. 2

Using RS485 communication

■ Operation by RS485 communication

To run/stop the inverter by RS485 communication, select "3: RS485 communication (connector 1)"
or "4: RS485 communication (connector 2)" with <CMOd: Run command select>.
To issue frequency commands by RS485 communication, select "21: RS485 communication
(connector 1)" or "22: RS485 communication (connector 2)" with <FMOd: Frequency command
select 1>.
Run commands and frequency commands by communication have priority over those from the
operation panel and terminals. Therefore, run commands and frequency commands from
communication can be enabled regardless of the settings of <CMOd> and <FMOd>.
However, when "48" (Communication priority cancel) of input terminal function selection is assigned
to the input terminal and a signal is input externally, perform panel run with the setting of <CMOd>
and <FMOd>.
When "2: Hand/Auto switching " is selected with <F750: EASY key function>, you can switch the
operation panel run and communication run with the [HAND/AUTO] key of the operation panel.

■ Transmission specifications

Item
Communication
protocol
Interface
Transmission scheme
Wiring
Transmission distance
Connection terminals
Synchronization
scheme
Communication baud
rate
Character
transmission
Error detecting
scheme 1
Error detecting
scheme 2
Stop bit length
Order of bit
transmission format
Character
transmission format
Inverter Number
TOSHIBA inverter protocol
RS485 compliant
Half duplex [Serial bus type (Line terminations resistor necessary at both ends of
system)]
2-wire
500 m max. (total length)
32 max. (including upper host computer)
Inverters connected in the system: 32 max.
Start-stop synchronization
9600 bps - 38.4 kbps
ASCII mode: JIS X0201 8-bit (ASCII)
Binary mode: Binary codes fixed to 8 bits
Parity: Even/Odd/Non parity (selectable using a parameter)
Checksum
Received by inverter: 1bit/Sent by inverter: 2 bits
Low-order bits transmitted first
11-bit characters (Stop bit =1, with parity)
ASCII mode: 0 - 99
Binary mode: 0 - 63 (3Fh)
6-187
Specifications
MODBUS-RTU protocol
Binary codes fixed to 8 bits
CRC
1 - 247
6. [Advanced] How to use parameters
E6582062
3
4
6
9