N100
plus
Inverter RS485 Interface Instruction Manual
1.1.5
Communication order
The flow of the communication protocol between an external control device and an
inverter is shown below in the time diagram.
Fig. 4 Communication order
Devices
External control
Frame 2
(setting with operator)
Waiting time
Frame 1
Inverter
Frame start :
Frame start is recognized by signal line data transmitted.
Frame completion: Frame completion is recognized by no data during correspond 4,
5-character time.
Frame 1: Transmit from external controller to inverter.
Frame 2: Indication reflects from inverter to external controller.
Frame 2 in inverter displays as the signal that inverter receiving Frame 1
and recognizes a suitable frame and responds, and don
’
t output actively.
1.2
Communication protocol
ModBus protocol that applies Query-Response Cycle method is used in the communication.
The communication network is controlled by the master equipment, and it is operated by
the method that the slave equipment reply from the transmission request of the master
equipment. ModBUS communication frame type and form is as follows.
N100_Inverter RS485 Interface Manual(English).doc
4
