Data Configuration - Citizen iDP-460 User Manual

7.3.2

Data Configuration

Mark
Space
(1) Start bit
After a lapse of 1/2 bit from a mark-to-space fall edge, the state is read again, and if it is a space, it is
recognized as the start bit. If it is a mark, it is assumed neither the start bit nor an error, and it is
attempted to detect the start bit again.
(2) Data bit + parity bit
The data bit and parity bit are sampled for 1 bit worth of time from the 1/2 start bit. The then state is
assumed the data for the corresponding bit. A sequence of the bits are named Bit 0, Bit 1, ..., parity bit,
starting from the one closest to the start bit.
(3) Stop bit
The stop bit is a mark level of 1 bit or more. If a space is detected in detecting the stop bit, a framing
error results.
b , b , b ,........
0 1 2
(1)
(1) Start Bit
(2) Data Bit (+ Parity Bit)
(3) Stop Bit (1 or More)
(2)
iDP-460 User's Manual
t
(3)