57
4. Parameter description
Parameter
Parameter
Factory
setting
Setting range
Remarks
Parameter
51
1
1~2
1
Only CR
2
CR and LF
52
1
0~10
(Note 2)
53
9999
0~999.8s, 9999
0~999.8
do
communication
overtime
test
according to the set value
9999
9999: No communication overtime test
(Note 3)
153
0
0, 1
0
Warn and coast to stop
1
No warning and keep running
154
4
0~5
0
Modbus ASCII mode, Protocol<1,7,N,2>
(Note 4)
1
Modbus ASCII mode, Protocol<1,7,E,1>
2
Modbus ASCII mode, Protocol<1,7,O,1>
3
Modbus RTU mode, Protocol<1,8,N,2>
4
Modbus RTU mode, Protocol<1,8,E,1>
5
Modbus RTU mode, Protocol<1,8,O,1>
Note: 1. The number of inverters which the communication interface enables a host computer to control is due to
the wiring method and impedance matching. Once Modbus protocol is selected, please set P.33 to nonzero
value.
2. If the time of communication error exceeds the set value of P.52, and P.153 is set to 0, an alarm will be
output, and the screen of DU03B will display
.
3. When P.53=9999, there is no time limit.
4. Modbus protocol. Protocol<1,7,N,2> means 1 start bit, 7 data bits, No parity bit, and 2 stop bit. N: no
parity, E: 1-bit even parity, O: 1-bit odd parity.
System configuration of SE2-RS485 communications interface
●
For only one inverter connecting to computer
computer
D
A
+
D
B
-
Station number 1
Inverter 1
RS-485
DATA+
/
cnverter
RS-232
DATA-
RS- 232
RS- 485
