Salicru CV10-002-S2 User Manual page 79

T1-T2-T3-T4 between START and END is to provide at least the time of 3.5 bytes as the leisure time and
distinguish two messages for the avoidance of taking two messages as one message.
ADDR = 01H means the command message is sent to the inverter with the address of 01H and ADDR occupies
one byte
CMD=03H means the command message is sent to read data form the inverter and CMD occupies one byte
"Start address" means reading data form the address and it occupies 2 bytes with the fact that the high bit is in
the front and the low bit is in the behind.
"Data number" means the reading data number with the unit of word. If the "start address' is 0004H and the
"data number" is 0002H, the data of 0004H and 0005H will be read.
CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the behind.
RTU slave response message (from the inverter to the master)
Byte number
Data high bit of address 0004H
Data low bit of address 0004H
Data high bit of address 0005H
Data low bit of address 0005H
CRC CHK low bit
CRC CHK high bit
The meaning of the response is that:
ADDR = 01H means the command message is sent to the inverter with the address of 01H and ADDR occupies
one byte
CMD=03H means the message is receiced from the inverter to the master for the response of reading
command and CMD occupies one byte
"Byte number" means all byte number from the byte (excluding the byte) to CRC byte (excluding the byte). 04
means there are 4 byte of data from the "byte number" to "CRC CHK low bit", which are "digital address 0004H
high bit", "digital address 0004H low bit", "digital address 0005H high bit" and "digital address 0005H low bit".
There are 2 bytes stored in one data with the fact that the high bit is in the front and the low bit is in the behind of
the message, the data of data address 0004H is 1388H, and the data of data address 0005H is 0000H.
CRC occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the behind.
7.3.2 Command code: 06H
06H (correspond to binary 0000 0110), write one word (Word)
The command means that the master write data to the inverter and one command can write one data other than
multiple dates. The effect is to change the working mode of the inverter.
For example, write 5000 (1388H) to 0004H from the inverter with the address of 02H, the frame structure is as
below:
RTU master command message (from the master to the inverter)
Communication protocol
START
ADDR
CMD
END
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
01H
03H
04H
13H
88H
00H
00H
7EH
9DH
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