139
CRC CHK Low number
Detected value
：
CRCCheck value
（
16BIT
）
CRC CHK High number
End of frame END
T1-T2-T3-T4
（
3.5 bytes of transmission time
）
END Lo
8.6 Command code and communication data description
8.6.1 Command code: 03H (0000 0011), read N words (Word) (up to 16 words can
be read continuously)
For example, if the slave address is 01H, the memory start address is 0007 (the
maximum output frequency address). If one consecutive word is read, the structure of the
frame is described as follows
：
RTU host command information
START
T1-T2-T3-T4
ADDR
01H
CMD
03H
Start address high
(parameter group
number)
00H
（
F0 Group
）
Start address low
(parameter number)
07H
（
F0.07
）
High number of data
00H
Low number of data
01H
CRC CHK High number
35H
CRC CHK Low number
CBH
