Goodrive100 inverters
Communication protocol
IKR Aandrijven en Besturen
www.ikr-industries.nl
checkout. If the parity of the receiving data is different from the setting value, there is an error in the
communication.
CRC check
The checkout uses RTU frame format. The frame includes the frame error detection field which is based on the
CRC calculation method. The CRC field is two bytes, including 16 figure binary values. It is added into the
frame after calculated by transmitting device. The receiving device recalculates the CRC of the received frame
and compares them with the value in the received CRC field. If the two CRC values are different, there is an
error in the communication.
During CRC, 0*FFFF will be stored. And then, deal with the continuous 6-above bytes in the frame and the
value in the register. Only the 8Bit data in every character is effective to CRC, while the start bit, the end and
the odd and even check bit is ineffective.
The calculation of CRC applies the international standard CRC checkout principles. When the user is editing
CRC calculation, he can refer to the relative standard CRC calculation to write the required CRC calculation
program.
Here provided a simple function of CRC calculation for the reference (programmed with C language):
unsigned int crc_cal_value(unsigned char *data_value,unsigned char data_length)
{
int i;
unsigned int crc_value=0xffff;
while(data_length--)
{ crc_value^=*dat+;
for(i=0;i<8;i++)
{
if(crc_value&0x0001)crc_value=(crc_value>>1)^0xa001;
