Holip HLP-A Series, Instruction Manual

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HLP-A Series
HLP-A Series -
79
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all data. The last data of CRC register is CRC value. When send CRC value in
command data, low bytes must change the sequence with high bytes, i.e. low
bytes will be sent first.
(7) Example 1: Write 30.00Hz to inverter of 01
Command data
ADDR FUNC LEN DATA CRC
01H 02H 03H 00H 0BH B8H 7FH 0CH
Sent data: 01H 02H 03H 00H 0BH B8H 7FH 0CH
(8) Example 2:
The following is that get CRC value with C language. The f unction has
two parameters:
Unsigned char *data ← the point of data buffer
Unsigned char length ← number of data buffer
This f unction will send back the CRC value with unsigned integer
format.
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&0×01){/*LSB(b0)=1*/
reg_crc=(reg_crc>>1)^0xa001;
}else{
reg_crc=reg_crc>>1;
}
}
}
return reg_crc;
}
This parameter is only valid when Bit 2 is set to 1 in CD168. For the details refer
to CD168.
0: Inverter Temperature
1: Counter Value
2: PID Target Value
3: PID Feedback Value
4: Present running time of power up (Unit: Hour)
CD167 Display Items
Set Range : 0—31 Unit: 1 Factory Setting: 0