Chapter 5 - MODBUS-RTU Communication

Items

Specifications

Control procedure

Asynchronous communication system

Communication system

Half duplex system

Character system

ASCII (8 bit)

Stop bit length

Modbus-RTU: 1 bit, CMC BUS: 2 bit

Sum check

2 byte

Parity check

None

5.3 Installation

5.3.1Connecting the communication line

-First connect the 485 GND of MODBUS-RTU communication line to the inverter’s (CM) terminals of the control terminals.

-Then connect the MODBUS-RTU communication line to the inverter’s (S+), (S-) terminals of the control terminals.

-Check the connection and turn ON the inverter.

-If the communication line is connected correctly set the communication related parameters as the following:

-Operate with DriveView if DriveView is operating, if not operate with the Keypad.

DRV-03 [Drive mode] : 3(RS485)

DRV-04 [Freq. mode] : 5(RS485)

I/O-46 [Inv. Number] :1~31 (If more than 1 inverters are connected, be sure to use different numbers for each inverter)

I/O-47 [Baud-rate] : 9,600 bps (Factory default)

I/O-48 [Lost Mode] : 0 - No action (Factory default)

I/O-49 [Time-Out] : 10 – 1.0sec (Factory default)

I/O-50 [Comm.Prot] : 7 - Modbus-RTU, 0 – CMC BUS

5.3.2System configuration

 

 

 

 

 

 

 

 

INV.#1

 

 

 

 

INV.#2

 

 

 

INV.#n

JP1 switch on the

 

 

 

RS232/485

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

right upper side of

 

 

 

Converter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

control terminal

 

 

 

 

 

 

 

 

Comm.

 

 

 

 

 

Comm.

 

 

 

 

Comm.

 

block should be

 

 

 

 

 

 

 

 

Terminal

 

 

 

 

 

Terminal

 

 

 

 

Terminal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

shorted using jumper

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thinkpad

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to connect a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

terminating resistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at the end inverter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connected.

-The number of drives to be connected is up to 31 drives.

-The specification of length of communication line is max. 1200m. To ensure stable communication, limit the length below 700m.

-Use shielded wire for all control signal wiring.

75

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Cleveland Range inverter Installation, MODBUS-RTU Communication, Items Specifications, Connecting the communication line

inverter specifications

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