Craftsman G10-0R7G-2SB Manual

1428.6.3.1 Byte bit checkUsers can choose different bit verification methods as needed, or they can choose noparity, which will affect the parity bit setting of each byte.The meaning of even parity: an even parity bit is added before data transmission toindicate whether the number of "1" in the transmitted data is odd or even. When it is even,the check position is "0", otherwise it is set. It is "1" to keep the parity of the dataunchanged.The meaning of odd parity: an odd parity bit is added before data transmission toindicate whether the number of "1" in the transmitted data is odd or even. When it is odd,the check position is "0", otherwise it is set. It is "1" to keep the parity of the dataunchanged.For example, you need to transfer "11001110", the data contains 5 "1", if you useeven parity, its even parity bit is "1", if you use odd parity, its odd parity bit is "0",transmission In the case of data, the parity bit is calculated at the position of the check bitof the frame, and the receiving device also performs parity check. If the parity of theaccepted data is found to be inconsistent with the preset, it is considered that thecommunication has an error.8.6.3.2 CRC check method:Using the RTU frame format, the frame includes a frame error detection fieldcalculated based on the CRC method. The CRC field detects the contents of the entireframe. The CRC field is two bytes and contains a 16-bit binary value. It is calculated bythe transmission device and added to the frame. The receiving device recalculates theCRC of the received frame and compares it with the value in the received CRC field. If thetwo CRC values are not equal, the transmission has an error.