Use this selection to choose the type of parity bits used for error checking.
Parity is a technique of checking whether data has been lost or written over when it is transmitted between computers. An additional binary digit, the parity bit, is added to a group of bits that are moved together. This bit is used only for the purpose of identifying whether the bits being moved arrived successfully. Before the bits are sent, they are counted and if the total number of data bits is even, the parity bit is set to one so that the total number of bits transmitted will form an odd number. If the total number of data bits is already an odd number, the parity bit remains or is set to 0. At the receiving end, each group of incoming bits is checked to see if the group totals to an odd number. If the total is even, a transmission error has occurred and either the transmission is retried or the system halts and an error message is sent to the user.
You can configure Parity to be none, odd, even, mark, or space. If Parity is none, parity checking is not performed and the parity bit is not transmitted. If Parity is odd, the parity bit is transmitted as either a '1' or a '0' so that the total number of '1' bits is an odd number. If Parity is even, the parity bit is transmitted as either a '1' or a '0' so that the total number of '1' bits is an even number. If Parity is mark, the parity bit is always transmitted as a binary '1'. If Parity is space, the parity bit is always transmitted as a binary '0'.