Kalatec Automacao STR6-RS485, User Manual

Page: 23 / 24

23
6.4.3 Write multiple registers command 0x10
Host -> Slave Data
Device
address Function
code The
starting
address
Write
the
number
The
number
of
bytes Write
content Write
content CRC
check
01 10 00 44 00 02 04 38 80 00 01 3B 24
Slave -> Host Data
Function
code The starting
address Write the
number CRC check
01 10 00 44 00 02 01 DD
Write 14464 to the slave 16bit low (register address 64) and 16bit high (register address)
65) Write 1, that is, the total number of trips is 80000pulse.
6.5 CRC
Validation routines
The following routine calculates CRC using the C language.
Uint16
Funct_CRC16
(
unsigned char
* puchMsg, Uint16 DataLen)
{
Uint16 i,j,tmp; Uint16
crcdata=0xFFFF;
for
(i=0;i<DataLen;i++)
{
crcdata=(*puchMsg)^crcdata;
+;
for
(j=0;j<8;j++)
{
tmp=crcdata&0x0001;
crcdata=crcdata>>1;
if
(tmp){
crcdata=crcdata^0xA0
01;
}
} }
return
crcdata;
}