INVT CHV160A Series - 9 Communication Protocol; Interfaces; Communication Modes; Protocol Format

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CHV160A series special inverter for water supply
9. COMMUNICATION PROTOCOL
9 . 1 I nterfaces
RS485: asynchronous, half-duplex.
Default: 8-E-1, 19200bps. See Group PC parameter settings.
9 . 2 Commu ni cat i on Modes
(1) The protocol is Modbus protocol. Besides the common register Read/W rite operation,
it is supplemented with commands of parameters management.
(2) The drive is a slave in the network. It communicates in ‘point to point’ master-slave
mode. It will not respond to the command sent by the master via broadcast address.
(3) In the case of multi-drive communication or long-distance transmission, connecting a
100~120Ω resistor in parallel with the master signal line will help to enhance the immunity
to interference.
9 . 3 Protoco l Format
Modbus protocol supports both RTU and ASCII mode. The frame format is illustrated as
follows: