Data Configuration - Citizen iDP3420 User Manual

10.3.2 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.
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.
is assumed the data for the corresponding bit.
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.
framing error results.
b , b , b ,
0 1 2
(1)
(1) Start Bit
(2) Data Bit (+ Parity Bit)
(3) Stop Bit (1 or More)
If it is a mark, it is assumed neither the start bit nor an error, and it is
(2)
A sequence of the bits are named Bit 0, Bit 1, ...,
If a space is detected in detecting the stop bit, a
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iDP3420/3421/3423 User's Manual
t
(3)
The then state
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