DRV-28 inverter
s Communication protocol
-266-
For example, to write 5000 (1388H) and 50 (0032H) respectively to 0004H and 0005H of the inverter
whose slave address is 02H, the structure of the frame is described in the following table.
RTU master command (transmitted by the master to the inverter)
START
T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR
02H
CMD
10H
MSB of data writing address
00H
LSB of data writing address
04H
MSB of data quantity
00H
LSB of data quantity
02H
Number of bytes
04H
MSB of data to be written to 0004H
13H
LSB of data to be written to 0004H
88H
MSB of data to be written to 0005H
00H
LSB of data to be written to 0005H
32H
LSB of CRC
C5H
MSB of CRC
6EH
END
T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU slave response (transmitted by the inverter to the master)
START
T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR
02H
CMD
10H
MSB of data writing address
00H
LSB of data writing address
04H
MSB of data quantity
00H
LSB of data quantity
02H
LSB of CRC
C5H
MSB of CRC
6EH
END
T1-T2-T3-T4 (transmission time of 3.5 bytes)
9.4.5 Data address definition
This section describes the address definition of communication data. The addresses are used for
controlling the running, obtaining the state information, and setting related function parameters of the
inverter.
9.4.5.1 Function code address representation rules
The address of a function code consists of two bytes, with the MSB on the left and LSB on the right.
The MSB ranges from 00 to ffH, and the LSB also ranges from 00 to ffH. The MSB is the hexadecimal
form of the group number before the dot mark, and LSB is that of the number behind the dot mark.
Take P05.06 as an example, the group number is 05, that is, the MSB of the parameter address is the
hexadecimal form of 05; and the number behind the dot mark is 06, that is, the LSB is the