Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
9
4.
Software Functions
4.1
Communication
The configuration and the programming of the RVBS drive, as well as the run/stop commands and the
speed reference are managed via RS-485 serial connection with ModBus RTU protocol.
4.1.1
Network address
The ModBus network address can be set from 1 to 255
Function
code
Mod.
add.
Description
Def.
Min
Max
U.M.
R/W
Y01
0x0401
RS-485 Communication 1
(Station address)
1
1
255
-
R/W
4.1.2
Communication setting
The transmission speed can be selected between 9600 and 38400 bit/s. All devices connected in the serial
network must have the same communication baudrate and the same data communication parity.
Function
code
Mod.
add.
Description
Def
Min
Max
U.M.
R/W
Y02
0x0402
Communication error processing
0
0
3
-
R/W
Y03
0x0403
Timer
20
0
600
s
R/W
Y04
0x0404
Baud rate
3
0
4
R/W
Y05
0x0405
Data length
0
0
0
R/W
Y06
0x0406
Parity check
3
3
3
R/W
Y07
0x0407
Stop bits
1
1
1
R/W
Y08
0x0408
No-response error detection time
0
0
60
s
R/W
Y09
0x0409
Response interval
1
0
100
s
R/W
4.1.3
ModBus commands
The RVBS drive only uses Registers (16 bit), not Boolean variables (coils). The ModBus functions
implemented are as follows:
Function code (FC)
Function name
3
Read Holding Registers (8 registers maximum)
6
Preset Single Register
8
Diagnostics
