E6582062
6. [Advanced] How to use parameters 6-188
4
4
6
9
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 Specifications
Communication
protocol
TOSHIBA inverter protocol MODBUS-RTU protocol
Interface RS485 compliant
Transmission scheme Half duplex [Serial bus type (Line terminations resistor necessary at both ends of
system)]
Wiring 2-wire
Transmission distance 500 m max. (total length)
Connection terminals 32 max. (including upper host computer)
Inverters connected in the system: 32 max.
Synchronization
scheme
Start-stop synchronization
Communication baud
rate
9600 bps - 38.4 kbps
Character
transmission
ASCII mode: JIS X0201 8-bit (ASCII)
Binary mode: Binary codes fixed to 8 bits
Binary codes fixed to 8 bits
Error detecting
scheme 1
Parity: Even/Odd/Non parity (selectable using a parameter)
Error detecting
scheme 2
Checksum CRC
Stop bit length Received by inverter: 1bit/Sent by inverter: 2 bits
Order of bit
transmission format
Least significant bit transmitted first
Character
transmission format
11-bit characters (Stop bit =1, with parity)
Inverter Number ASCII mode: 0 - 99
Binary mode: 0 - 63 (3Fh)
1 - 247
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