CARLO GAVAZZI VariFlex3 RVLF Series User Manual

Motor Controllers AC Variable Frequency Drives Type VariFlex
3
RVLF
142 Specications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 13/12/2017
1. Communication Data Frame
RVLF series inverter can be controlled by a PC or other controller with the communication
protocol, Modbus ASCII Mode & Mode RTU, RS485 or RS232. Frame length maximum 80
bytes.
The network is terminated at each end with an external terminating resistor (120Ω, 1/4W)
Controller
(PLC/HMI or PC)
Slave RVLF
Station 01
Option Card
A B
Slave RVLF
Station 02
Option Card
A B
Slave RVLF
Station 03
Option Card
A B
Slave RVLF
Station FE
Option Card
A B
RS485
Interface
Response
Request
120Ω
1/4W
120Ω
1/4W
1.2. Data Format ASCII MODE
STX(3AH) Start bit = 3AH
Address Hi
Communication address (station):
2-digit ASCII code
Address Lo
Function Hi
Function code (command):
2-digit ASCII code
Function Lo
Command start address
Command start byte:
4-digit ASCII code
Command start address
Command start address
Command start address
Data length
The length of the command:
4-digit ASCII code
Data length
Data length
Data length
LRC check Hi
LRC check code:
2-digit ASCII code
LRC check Lo
END Hi
End byte :
END Hi = CR (0DH), END Lo= LF (0AH)
END Lo
Appendix 3: RVLF MODBUS
protocol

CARLO GAVAZZI VariFlex3 RVLF Series Specifications

General

Brand	CARLO GAVAZZI
Model	VariFlex3 RVLF Series
Category	Controller
Language	English