Salicru CV50-008-4F User Manual page 112

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 received 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.
9.4.1.2 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)
High bit of writing data address
Low bit of writing data address
High bit of data content
Low bit of data content
CRC CHK low bit
CRC CHK high bit
RTU slave response message (from the inverter to the master)
High bit of writing data address
Low bit of writing data address
High bit of data content
Low bit of data content
CRC CHK low bit
CRC CHK high bit
9.4.1.3 Command code 08H for diagnosis
Meaning of sub-function codes
Sub-function Code
For example: The inquiry information string is same as the response information string when the loop
detection to address 01H of driver is carried out.
112 - 144
START
ADDR
CMD
END
START
ADDR
CMD
END
0000
T1-T2-T3-T4 (transmission time of 3.5 bytes)
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4 (transmission time of 3.5 bytes)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
02H
06H
00H
04H
13H
88H
C5H
6EH
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Description
Return to inquire information data
Communication Protocol