Citizen Systems iDP-3423 Benutzerhandbuch
iDP-3420/3421/3423 User’s Manual
50
CITIZEN
10
10
10
10....3333....2222 D
D
D
Daaaatttta
a
a
a C
C
C
Coooonnnnffffiiiigggguuuurrrraaaattttiiiioooonnnn
t
Mark
b
0
, b
1
, b
2
, · · · ·
Space
(1)
(2)
(3)
(1) Start Bit
(2) Data Bit (+ Parity Bit)
(3) Stop Bit (1 or More)
(2) Data Bit (+ Parity Bit)
(3) Stop Bit (1 or More)
(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.
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.
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.
bit, a framing error results.