SANCH S3000 Series, Руководство пользователя

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5-69
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; // the value that sent back to the CRC register finally
}
4. Definition of the Parameters Addresses of the Communication Protocol:
Definition Parameter Address Function
Parameter setting
within the drive
GGnnH GG suggests the parameter group whereas nn
suggests the parameter code. For example,
Pr. 04-01 is indicated as 0401H.
Command toward
the drive
2000H Bit0~3 0: no function
1: STOP
2: RUN
3: JOG + RUN
Bit4~5 00B: no function
01B: FWD
10B: REV
11B: direction change