Delta Electronics VFD-L Series Especificaciones descargar pdf (Pagina 73)

VFD-M Series

5-47

Step 5: Repeat step 3 and 4 until eight shifts have been performed. When this is done, a

complete 8-bit byte will have been processed.

Step 6: Repeat steps 2 to 5 for the next 8-bit byte of the command message.

Continue doing this until all bytes have been processed. The final contents of the CRC

When transmitting the CRC value in the message, the upper

and lower bytes of the CRC value must be swapped, i.e. the lower order byte will be

transmitted first.

The following is an example of CRC generation using C language. The function takes two

arguments:

Unsigned char* data

 a pointer to the message buffer

Unsigned char length

 the quantity of bytes in the message buffer

The function returns the CRC value as a type of unsigned integer.

Unsigned int crc_chk(unsigned char* data, unsigned char length){

int j;

unsigned int reg_crc=0xFFFF;

while(length--){

reg_crc ^= *data++;

for(j=0;j<8;j++){

if(reg_crc & 0x01){ /* LSB(b0)=1 */

reg_crc=(reg_crc>>1) ^ 0xA001;

}else{

reg_crc=reg_crc >>1;

}

return reg_crc;

}

3.6 Address list:

The contents of available addresses are shown as below:

Content

Address

Functions

AC drive

Parameters

00nnH 00 means parameter group, nn means parameter number, for

example, the address of Pr.100 is 0064H. Referencing to

chapter 5 for the function of each parameter. When reading

parameter by command code 03H, only one parameter can be

read at one time.

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Delta Electronics VFD-L Series Especificaciones Pagina 73