Series 2000 Communications Handbook - Soliton

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MODBUS and JBUS ProtocolSeries 2000 Communications HandbookFunction 16 Bit Register CarryLSB MSB flag4th shift right 0110 0100 0001 0011 05th shift right (carry = 0) 0011 0010 0000 1001 1A001 1010 0000 0000 0001Exclusive OR (carry = 1) 1001 0010 0000 10006th shift right 0100 1001 0000 0100 07th shift right (carry = 0) 0010 0100 1000 0010 08th shift right (carry = 0) 0001 0010 0100 0001 0CRC error check code 12h 41hThe final message transmitted, including the CRC code, is as follows;Device address Function code CRC MSB CRC LSB02h 07h 41h 12h0000 0010 0000 0111 0100 0001 0001 0010↑ First bit Transmission order Last bit ↑3-10 Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00
Series 2000 Communications HandbookMODBUS and JBUS Protocol3.10. EXAMPLE OF A CRC CALCULATION IN THE ‘C’LANGUAGEThis routine assumes that the data types ‘uint16’ and ‘uint8’ exists. These are unsigned 16bit integer (usually an ‘unsigned short int’ for most compiler types) and unsigned 8 bitinteger (unsigned char). ‘z_p’ is a pointer to a Modbus message, and z_message_length is itslength, excluding the CRC. Note that the Modbus message will probably contain ‘NULL’characters and so normal C string handling techniques will not work.uint16 calculate_crc(byte *z_p, uint16 z_message_length)/* CRC runs cyclic Redundancy Check Algorithm on input z_p *//* Returns value of 16 bit CRC after completion and *//* always adds 2 crc bytes to message *//* returns 0 if incoming message has correct CRC */{}uint16 CRC= 0xffff;uint16 next;uint16 carry;uint16 n;uint8 crch, crcl;while (z_message_length--) {next = (uint16)*z_p;CRC ^= next;for (n = 0; n < 8; n++) {carry = CRC & 1;CRC >>= 1;if (carry) {CRC ^= 0xA001;}}z_p++;}crch = CRC / 256;crcl = CRC % 256z_p[z_message_length++] = crcl;z_p[z_message_length] = crch;return CRC;Series 2000 Communications Handbook Part No HA026230 Issue 2.0 Feb-00 3-11
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ASCII CodesSeries 2000 Communicatio
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