Fuji Bikes 5000G11S/P11S Benutzerhandbuch

9-8

9-4 RS-485 Modbus RTU Serial Communications

The serial interface supports operation, configuration and monitoring of inverter functions through an
EIA/RS-485 connection. The serial interface is based on Modbus RTU protocol. This protocol allows the
inverter to function as an RTU slave on an industrial network.

9-4-1 Transmission Specification

Item Specification

Physical level

EIA/RS-485

Transmission distance

1600 ft (500 m)

Number of nodes

32 total

Transmission speed

19200, 9600, 4800, 2400 [bits/s]

Transmission mode

Half duplex

Transmission protocol

Modbus RTU

Character code

Binary

Character length

8 bits

Error check

CRC

9-4-2 Connection

Connection method
Use shielded wire and connect to the control terminals (DX-, DX+ and SD). A termination resistor should be
added between the data lines on the each end of the network. The value of the termination resistor
depends on the characteristic impedance of the cable. A common value for termination resistors is 120
ohms.

Control terminals

Terminal

marking

Terminal name

Function description

DX+

RS-485 communication data (+)

DX-

RS-485 communication data (–)

Input/output terminals for RS-485
communication.

Cable shield

Electrically floating

9-4-3 Serial Interface Configuration

Inverter function codes H30 to H39 are used to configure the serial interface parameters, such as device
address, baud rate and error response.

9-4-4 Modbus RTU Functions

The following RTU functions are supported. The maximum number of consecutive parameters for function
03 and 16 messages is 16.

Code Description

Read Holding Registers (16 registers maximum)

06 Preset

Single

Preset Multiple Registers (16 registers maximum)