ABB REF615E-E Dedicated Feeder Protection

ABB REF615E-E Dedicated Feeder Protection

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The total quantity of 1 bits in the frame is four. If Even Parity is used,the frame's parity bit will be a 0, making the total quantity of 1 bits stillan even number (four). 

If Odd Parity is used, the parity bit will be a 1,making an odd quantity (five).When the message is transmitted, the parity bit is calculated andapplied to the frame of each character. The receiving device counts thequantity of 1 bits and sets an error if they are not the same as config-ured for that device. 

All devices on the Modbus network must be config-ured to use the same parity check method.Note that parity checking can only detect an error if an odd number ofbits are picked up or dropped in a character frame during transmission.For example, if Odd Parity checking is employed, and two 1 bits aredropped from a character containing three 1 bits, the result is still anodd count of 1 bits.

ABB REF615E-E Technical drawing:

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