Delta VFD-B Series

Chapter 5 Parameters|VFD-B-P Series
Revision April 2009, SW V1.00 5-91
The following is an example of CRC generation using C language. The function takes two
arguments:
Unsigned char* data Å a pointer to the message buffer
Unsigned char length Å 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;
}
3.5 Address list
The contents of available addresses are shown as below:
Content Address Function
AC drive
Parameters
GGnn
H
GG means parameter group, nn means parameter number,
for example, the address of Pr 4-01 is 0401H. 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.
Bit 0-1
00B: No function
01B: Stop
10B: Run
11B: Jog + Run
2000H
Bit 2-3 Reserved
Command
Write only
Bit 4-5
00B: No function
01B: FWD
10B: REV
11B: Change direction