Sinee A90-4T032B - Page 210

User Manual of A90 Series Inverter
210
Function
code
Function code
name
Parameter description
Unit
Default
setting
Attribute
F10.01
Baud rate of
Modbus
communication
0:4800
1:9600
2:19200
3:38400
4:57600
5:115200
bps
1
○
During the communication based on the Modbus-RTU protocol, the A90 series
inverter supports six different baud rates in bps (bit/s). Take F10.01=9600bps as an example.
It means that data is transmitted at a rate of 9600bits per second. By default, each byte
consists of valid 8-bit data (such as 0x01). When 10-bit data needs to be transmitted in the
actual situation, the transmission time is about 1.04ms (approximately
1.04167ms=10bit/9600bps).
Function
code
Function
code name
Parameter description
Unit
Default
setting
Attribute
F10.02
Modbus data
format
0: 1-8-N-1 (1 start bit + 8 data bits + 1
stop bit)
1: 1-8-E-1 (1 start bit + 8 data bits + 1
even parity check bit + 1 stop bit)
2: 1-8-O-1 (1 start bit + 8 data bits + 1
odd parity check bit + 1 stop bit)
3: 1-8-N-2 (1 start bit + 8 data bits + 2
stop bits)
4: 1-8-E-2 (1 start bit + 8 data bits + 1
even parity check bit + 2 stop bits)
5: 1-8-O-2 (1 start bit + 8 data bits + 1
odd parity check bit + 2 stop bits)
0
○
In the UART transmission, the data usually consists of a start bit, valid data (8 bits by
default), check bit (optional), and a stop bit. The A90 series inverter supports six data
formats according to the Modbus-RTU combinations in communication.
Start Bit
Valid Data
Check Bit
Stop Bit
1
7
6
5
4
3
2
1
0
N/O/E
1
If F10.02=0, it means that the current data consists of one start bit + eight data bits +
no check bit + one stop bit.
★ N (NONE): no parity; E (EVEN): even parity; O (ODD), odd parity.