Delta Electronics VFD-M manual whilelength-- regcrc = *data++ forj=0j8j++

Chapter 4 Parameters

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	00nnH	00 means parameter group, nn means parameter number, for
Parameters		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.
				00: No function
		Bit 0-1		01: Stop
				10: Run
				11: Jog + Run
	2000H	Bit 2-3		Reserved
				00: No function
Command		Bit 4-5		01: FWD
Read/Write				10: REV
				11: Change direction
		Bit 6-15		Reserved
	2001H	Freq. command
		Bit 0		1: EF (external fault) on
	2002H	Bit 1		1: Reset
		Bit 2-15		Reserved

4-68 Revision May 2008, ME14, SW V3.04