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Appendix A Modbus Communication Protocol
122
0xF002
A0.00 password authentication for the display and hidden attributes customized areas of the
function codes of the inverter, and it will be closed automatically if no operation is performed
within five minutes.
◆
Register for function code characteristics of the inverter
Attached Table
−
5
Register
address
Meaning
Range
Read (R) and Write (W)
0xF080
Relative address of the
function code
See Attached Table
−
1
R/W
0xF081
Current value
0 ~ 65535
R/W
0xF082
Upper Limit
0 ~ 65535
R
0xF083
Lower Limit
0 ~ 65535
R
0xF084
Factory default value of the
function code
0 ~ 65535
R
It can write the function code No. into 0xF080 by reading and writing multiple register commands 0x17
firstly and then read several attributes of this function code.
6. CRC16 Function
unsigned int crc16(unsigned char *data,unsigned char length)
{
int i,crc_result=0xffff;
while(length
−−
)
{
crc_result^=*data++;
for(i=0; i<8; i++)
{
if(crc_result&0x01)
crc_result=(crc_result>>1) ^0xa001;
else
crc_result=crc_result>>1;
}
}
return (crc_result=((crc_result&0xff) <<8) |(crc_result>>8) ) ; //Exchange CRC16 check sum and bytes at
higher and lower orders
}
