Salicru CV10-002-S2, Руководство пользователя, Страница: 81 / 104

Communication protocol 81 - 104
Low byte of CRC ADH
High byte of CRC 14H
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
The RTU response command is:
START T1-T2-T3-T4 (transmission time of 3.5 bytes)
ADDR 01H
CMD 08H
High byte of sub-function code 00H
Low byte of sub-function code 00H
High byte of data content 12H
Low byte of data content ABH
Low byte of CRC ADH
High byte of CRC 14H
END T1-T2-T3-T4 (transmission time of 3.5 bytes)
7.3.4 The definition of data address
The address definition of the communication data in this part is to control the running of the inverter and get the
state information and relative function parameters of the inverter.
7.3.4.1 The rules of parameter address of the function codes
The parameter address occupies 2 bytes with the fact that the high bit is in the front and the low bit is in the
behind. The range of high and low byte are: high byte—00~ffH; low byte—00~ffH. The high byte is the group
number before the radix point of the function code and the low byte is the number after the radix point. But both
the high byte and the low byte should be changed into hex. For example P05.05, the group number before the
radix point of the function code is 05, then the high bit of the parameter is 05, the number after the radix point 05,
then the low bit of the parameter is 05, then the function code address is 0505H and the parameter address of
P10.01 is 0A01H.
Note: PE group is the factory parameter which can not be read or changed. Some parameters can not be changed
when the inverter is in the running state and some parameters can not be changed in any state. The setting range, unit
and relative instructions should be paid attention to when modifying the function code parameters.
Besides, EEPROM is stocked frequently, which may shorten the usage time of EEPROM. For users, some
functions are not necessary to be stocked on the communication mode. The needs can be met on by changing
the value in RAM. Changing the high bit of the function code form 0 to 1 can also realize the function. For