Delta Electronics Elevator Drive VFD-VL - Manual (Page 148)

Chapter 4 Parameters|
Revision Nov. 2008, VLE1, SW V1.03 4-93
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.
Command
Write only
2000H Bit 0-3
0: No function
1: Stop
2: Run
3: Jog + Run
Bit 4-5
00B: No function
01B: FWD
10B: REV
11B: Change direction
Bit 6-7
00B: 1st accel/decel
01B: 2nd accel/decel
10B: 3rd accel/decel
11B: 4th accel/decel
Bit 8-11 Represented 16 step speeds.