Series 2000 Communications Handbook - Soliton

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MODBUS and JBUS ProtocolSeries 2000 Communications HandbookThe flow chart below illustrates this CRC error check algorithm.The '⊕' symbol indicates an 'exclusive OR' operation. 'n' is the number of data bits.STARTFFFFh → CRC RegisterCRC Register ⊕ next byte of the message → CRC Register0 → nShift CRC Register right 1 bitNOOver flow ?YESCRC Register ⊕ A001h → CRC Registern + 1 → nNOn > 7 ?YESCRC Register ⊕ next byte of the message → CRC RegisterNOIs message complete ?YESEND3-8 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookMODBUS and JBUS Protocol3.9. EXAMPLE OF A CRC CALCULATIONThis example is a request to read from the slave unit at address 02, the fast read of the status(07).Function 16 Bit Register CarryLSB MSB flagLoad register with FFFF hex 1111 1111 1111 1111 0First byte of the message (02) 0000 0010Exclusive OR 1111 1111 1111 11011st shift right 0111 1111 1111 1110 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1101 1111 1111 11112nd shift right 0110 1111 1111 1111 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1100 1111 1111 11103rd shift right 0110 0111 1111 1111 04th shift right (carry = 0) 0011 0011 1111 1111 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1001 0011 1111 11105th shift right 0100 1001 1111 1111 06th shift right (carry = 0) 0010 0100 1111 1111 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1000 0100 1111 11107th shift right 0100 0010 0111 1111 08th shift right (carry = 0) 0010 0001 0011 1111 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1000 0001 0011 1110Next byte of the message (07) 0000 0111Exclusive OR (shift = 8) 1000 0001 0011 10011st shift right 0100 0000 1001 1100 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1110 0000 1001 11012nd shift right 0111 0000 0100 1110 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1101 0000 0100 11113rd shift right 0110 1000 0010 0111 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1100 1000 0010 0110Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 3-9
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