When using HDLC, rather than each byte having a start, optional parity, and one or two stop bits, the bytes are gathered together into a frame.
32.
Since start and stop bits are not present, this allows better use of data transmission bandwidth for more message bits and makes the whole transmission process simpler and easier.
33.
Since the start bit is logic low ( 0 ) and the stop bit is logic high ( 1 ) there are always at least two guaranteed signal changes between characters.
34.
The time between characters need not be an integral multiple of a bit time, but it must be at least the minimum number of stop bits required by the receiving machine.
35.
When the line is broken, the continuous spacing ( open circuit, no current flowing ) causes a receiving teleprinter to cycle continuously, even in the absence of stop bits.
36.
So a designation of 9600-8-E-2 would be 9, 600 bits per second, with eight bits per character, even parity and two stop bits.
37.
The Model 37 terminal utilizes a serial input / output 10 unit code signal consisting of a start bit, seven information bits, an even parity bit and a stop bit.
38.
Thanks for your interest, and for taking the time to drop a line ( or perhaps " send a no-parity stop bit " would be more fitting ).
39.
On devices like modems, bytes may be more than 8 bits long because they may be individually padded out with additional start and stop bits; the figures below will reflect this.
40.
Many settings are required for serial connections used for asynchronous start-stop communication, to select speed, number of data bits per character, parity, and number of stop bits per character.
