Appendix I Rs485 communication protocol
I-1. Use introduction
This chapter introduces something about the install and handle of RS485 communication
between inverter and PLC, PC, factory computer.
● Can communicate with all computer.
● Using multi-drop link system, can link more to 127 inverters.
● Completely isolated, and noise shield.
● The user would use all types of RS232-485 inverter, if only the inverter had “automatic RTS
control” function inside.
I-2. Specification
I-2-1. Communication function
38400/19200/9600/4800/2400/1200 bps is selectable.
Modbus protocol, RTU format
Asynchronism communication methods, semi-duplex, the previous
high byte, low byte in the post, and low-effective-bit pre-emptive.
1 start bit, 8 data bits, 1 stop bit, invalid parity bit.
Slave addresses can be set up 1~ 127.0 for broadcast address, host
address 128 for the proportion of linkage, other addresses are reserved.
On-board keyboard (factory with standard), fixed 19200bps, Please
do not change baud rate.
Isolation RS485 / RS232 communication card (optional), the default
19200bps.
RJ45, 8-core shielded cable, fixed 19200bps.
I-3. Communication connection
I-3-1. Connecting Communication port A
● Connectting RS232 communication lines to frequency inverter control terminals row of RX232,
TX232
● Connecting RS485 communication lines to frequency inverter control terminal row of (SG+) ,
(SG-)
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