socomec MASTERYS GP4 Series - Modbus Error Code Management; Modbus CRC Calculation

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MODBUS RTU / MODBUS TCP for Modulys GP 2.0 - ITYS PRO UPS - Masterys GP4 UPS - Masterys BC+ UPS range - Ref.: IOMXXXOPXX00-EN 00
9.3 Error code management
Function error Code error Description Condition Specifi c address
0x83 0x01 Bad function
- Access to write only area
- Data reserved
0x83 0x02 Bad address
- Too many words
- The starting address + nb of words > table
length
SUBUNIT / UNIT not
present
0x86 0x01 Bad function
- Data in read only area
- Data reserved.
0x86 0x02 Bad address - Bad address event.
0x90 0x01 Bad function
- Data in read only area
- Data reserved.
0x90 0x02 Bad address
- Too many words.
- The starting address + nb of words > table
length
9.4 CRC calculation
CRC-16-CC-ITT with polynomial 0x-21
CRC16 = 0xFFFF
RIGHT SHIFT CRC16
CRC16 = CRC16 xor DATA
CRC16 = CRC16 xor 0xA001
CARRY
n=n+1
n>7
NEXT DATA
END OF MESSAGE?
END
YES
NO
n=0
NO
NO
YES
YES