Chapter 10 Communication Protocol
10.1 Networking Mode
According to the following pic 10-1, there are two networking modes： Single master and multi-slave, Single
master and single slave.
Pic 10-1
10.2 Interfaces
RS485 or RS232： asynchronous, semi-duplex
Default： 8-N-1, 9600bps, RTU. See Group b3 for parameter settings.
10.3 Communication Modes
1). The communication protocol for the drive is Modbus. It support normal reading and writing of the registers,
also supports managing the function code.
2). The drive is a slave in the network. It communicates in “point to point” mode.
3). When there is multi-station communication or the communication distance is long, please connect a
100~200 ohm resistance to the positive and minus terminal of the master’s signal wire in parallel.
4). FV 100 normally provides RS485 interface, if you need RS232, please choose to add a RS232/RS485
conversion equipment.
10.4 Protocol Format
FV20 support Modbus RTU and ASCII, its frame format is shown in Fig.10-2.
Fig.10-2 Modbus protocol format
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