INVT Goodrive350-19 Series User Manual

Goodrive350-19 series VFD Communication protocols
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1#
15#
32#
6
#
Main
control
device
Figure 10.5 Star connection
Use shielded cable, if possible, in multi-VFD connection. The baud rates, data bit check settings, and
other basic parameters of all the devices on the RS485 line must be set consistently, and addresses
cannot be repeated.
10.3.2 RTU
10.3.2.1 RTU communication frame structure
When a controller is set to use the RTU communication mode on a Modbus network, every byte (8
bits) in the message includes 2 hexadecimal characters (each includes 4 bits). Compared with the
ASCII mode, the RTU mode can send more data at the same baud rate.
Code system
· 1 start bit
· 7 or 8 data bits; the minimum valid bit is sent first. Each frame domain of 8 bits includes 2
hexadecimal characters (0–9, A–F).
· 1 odd/even check bit; this bit is not provided if no check is needed.
· 1 end bit (with check performed), 2 bits (without check)
Error detection domain
·Cyclic redundancy check (CRC)
The following tables provide the data formats.
11-bit character frame (Bits 1 to 8 are data bits)
Start bit
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
BIT8
Check
bit
End bit
10-bit character frame (Bits 1 to 7 are data bits)
Start bit
BIT1
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
Check
bit
End bit

INVT Goodrive350-19 Series Specifications

General

Brand	INVT
Model	Goodrive350-19 Series
Category	DC Drives
Language	English