Appendix A Response message: 4. LRC check （ Check sum ） LRC check code is the value by firstly getting the inverse values of every bit of the result value of addition operation of the data from communication ID to the last data content (Hex.) and then adding 1 to the final inverse value. For instance, LRC check code value: 0xF6. The method of calculating LRC check code value: 0x01+0x03+0x10+0x00+0x00+0x02 = 0x16, the result is 0xEA by getting the inverse values of every bit of 0x16 and then adding 1 to the final inverse value. A-8 DVP-MC operating manual ASCII code corresponding to field Field name Field character character Start character “：” 3A Communication address:
01 “0” 30 “1” 31 Function code: 03 “0” 30 “3” 33 Read data number （Counted by bytes） “0” 30 “4” 34 Read content of 0x1000 address “0” 30 “0” 30 “0” 30 “1” 31 Read content of 0x1001 address “0” 30 “0” 30 “0” 30 “2” 32 LRC check code: 0xF5 “F” 46 “5” 35 End character 1 “CR” 0D End character 0 “LF” 0A ASCII code corresponding to field Field name Field character character Start character “:” 3A Communication address: 01 “0” 30 “1” 31 Function code: 03 “0” 30 “3” 33 Start data address: 0x1000 “1” 31 “0” 30 “0” 30 “0” 30