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7-4 Serial Communication Function
7-4
Serial Communication Function
7-4-1 Outline
● The serial communication function is an interface function that controls the inverter using serial signals from a
computer. It can control inverter start/stop, frequency setting, operation status monitoring and function code reading
& setting.
● An RS485 communication interface is embedded in the inverter. With this interface, the computer can control
multiple inverters.
● The communication mode is RS485, SANKEN protocol and Modbus-RTU protocol can be used for RS485.
● The Modbus communication is composed with a master computer (PLC or PC) and up to 254 lower computers.
(248-254 are reserved.)
● In SANKEN protocol of RS485, one master computer and up to 32 inverters can be connected.
● The followings are communication specifications.
Electrical characteristic RS485 Communication
Communication
provision
SANKEN protocol Modbus-RTU protocol
Communication form
Bus form of 4-wire/2-wire
(RS485 standard)
Transmission distance
Total extension 500m
Terminal resistance must be connected
Number of connections
Up to 32 Up to 247*Note
Connection cable Shielded Twisted-Pair is recommended
Communication mode
Full duplex communication/Half duplex communication
Communication speed
[bps]
Selectable 57600/38400/19200/9600/4800/2400/1200
Synchronization mode Synchronization of start/stop
Data form
ASCII or BINARY BINARY
Data length 8bit
Stop digit
Selectable 1bit or 2bit
Parity check Yes(even, odd) No Selectable
Error correction
Data and correction CRC correction
Message
end code
ASCII
Selectable CR
＋
LF/CR
No
BINARY No
Note: SANKEN protocol is the dedicated protocol used by our company (F4005=1).
*
Note: When the number exceeds 32, a relay must be installed.