User`s manual

CBM-292/293 User’s Manual
36 CITIZEN
8.3 Data Configuration
Mark
b0, b1, b2
....
Space
1 2 3
1. Start Bit
2. Data Bits(+ Parity Bit)
3. Stop Bits (1 or More)
(1) Start bit
When a 1/2 bit passes from a fall edge of Mark to Space, the status is read again. If it is Space, it will
be recognized as the start bit. If it is Mark, it will not be recognized as the start bit. An attempt to
detect the start bit will be made again without taking it as an error.
(2) Data bits + parity bit
The data is sampled at 1 bit worth of time from the 1/2 start bit and the then status is taken as the data for
the relevant bit. The bits are arranged in order of Bit 0, Bit 1,..., Parity Bit, counting from the one
closest to the start bit.
(3) Stop bit
The stop bit is the Mark level of 1 bit or more. If Space is detected at stop bit detection time, a framing
error will result.