Appendix I
225
F9.00 baud rate 0：300, 1：600, 2：1200, 3：2400, 4：4800, 5：9600;6：
19200;7：38400;8：57600;9：115200
F9.02current inverter communication address 1~247 (If there are more than 1
inverters, don‟t use the same number);
When using RS485 running control methods, set F0.11=2,choice RS485
running control method
I-1-3 Protocol description
PI9000 series inverter communication protocol is a asynchronous serial master-
slave communication protocol, in the network, only one equipment(master) can
build a protocol (known as “Inquiry/Command”). Other equipment(slave) only can
response the "Inquiry/Command"of master by providing data or perform the
corresponding action according to the "Inquiry/Command"of master. Here, the
master refers to a Personnel Computer(PC), an industrial control device or a
programmable logic controller (PLC), etc. and the slave refers to PI9000 inverter.
Master can communicate with individUal slave, also send broadcasting information
to all the lower slaves. For the single "Inquiry/Command"of master, slave will return
a signal(that is a response) to master; for the broadcasting information sent by
master, slave does not need to feedback a response to master.
Communication data structure PI9000 series inverter's Modbus protocol
communication data format is as follows: in RTU mode, messages are sent at a silent
interval of at least 3.5 characters. There are diverse character intervals under
network baud rate,
which is easiest implemented. The first field transmitted is the device address.
The allowable characters for transmitting are hexadecimal 0 ... 9, A ... F. The
networked devices continuously monitor network bus, including during the silent
intervals. When the first field (the address field) is received, each device decodes it
to find out if it is sent to their own. Following the last transmitted character, a silent
interval of at least 3.5 characters marks the end of the message. A new message can
begin after this silent interval.
The entire message frame must be transmitted as a continuous stream. If a
silent interval of more than 1.5 characters occurs before completion of the frame, the
receiving device will flushes the incomplete message and assumes that the next byte
will be the address field of a new message. Similarly, if a new message begins
earlier than the interval of 3.5 characters following a previous message, the
receiving device will consider it as a continuation of the previous message. This will
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