DPR-400 User Manual Rev_01 Firmware V-1.0
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Follow the method shown below for CRC calculation,
1) A 16-bit variable named CRC with every bit set to 1 is initialized.
2) The result of the Boolean logic operation XOR of the bottom byte of CRC and the first byte of the
message (Function Code) is appended to CRC.
3) The least significant bit (LSB) of CRC has been defined. CRC is shifted right by 1 bit. Most
significant bit (MSB) of the CRC is set to 0.
4) If the LSB of the CRC is 1, CRC is XOR’d by A001h. The result is appended to CRC.
5) Steps 3 and 4 are repeated until 8 bits have been shifted.
6) Steps 2, 3, 4, 5 are repeated for the remaining 8 bits.
7) Once the process is complete for the entire data, the intermediate CRC value becomes final.
8) The calculated CRC is appended to the message packet starting with the bottom byte. The final
CRC value that must be calculated by the algorithm is shown below.
01 03 00 20 00 10 45 CC
01 06 00 40 00 10 89 D2
The unit features a 32-event capacity memory. To read the record memory, the record number from the
address “20899” is read. The read register value must be entered in the address “16389”. Then, the
relevant record can be read starting from address “4096”.
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