USB & RS232 Communication
Data Link Layer
EPOS4 Communication Guide
CCMC | 2019-11 | rel8759
2-19
12) Calculate the CRC (use algorithm as to chapter “2.2.3.2 CRC Algorithm” on page 2-14).
Thereby, valid value for CRC is “0” (zero):
ArrayLength= Len + 2
CrcValue = CalcFieldCRC(&DataArray, ArrayLength)
Valid = (0x0000 == CrcValue)
G) CHECK
13) Check the EPOS4 receive frame.
Important:
• If the error code is unequal to “0” (zero), the command was not processed!
• Check
chapter “6 Communication Error Code Definition” on page 6-47 for error details.
• Fix the error before attempting to resend the data frame.
Response frame
OpCode BYTE Read object 0x00
Len BYTE Number of words 0x04
Parameters
BYTE Node-ID 0x01
DWORD Communication error 0x00000000 no error
DWORD Data bytes read 0x00009001 36’865 inc
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