8-N-1
8-N-1 is a common shorthand notation for a serial port parameter setting or configuration in asynchronous mode, in which there is one start bit, eight data bits, no parity bit, and one stop bit. As such, 8-N-1 is the most common configuration for PC serial communications today.
The abbreviation is usually given together with the line speed in bits per second, as in 9600/8-N-1. The speed includes bits for framing and the effective data rate is lower than the bit transmission rate. For 8-N-1 encoding, only 80% of the bits are available for data. This mode was also commonplace for the link between modems until the 1990s when Link Access Procedure for Modems became widespread. 8-N-1 continued in use for the computer to modem connection.
