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iDP-3210 User’s Manual
CITIZEN
40
6.2.4 Data Configuration
-------à t
Mark
Space
1 2 3
1. Start bit
2. Data bit (+ parity bit)
3. Stop bit ( 1 or more )
(1) Start Bit
In 1/2 bit from the mark-to-space starting edge, state is read once again. When "space"
state is confirmed, it is recognized as the start bit. If it is "mark" state, it is not taken as
the start bit. Without taking it as an error, detection of a start bit is carried out once again.
(2) Data Bit + Parity Bit
Data bit and parity bit are sampled at 1/2 start bit for time length equal to 1 bit. The state
thus sampled is taken as the data for the bit concerned. Bits are named as
Bit 0, Bit 1, ..... parity bit counted from the one close to the start bit.
(3) Stop Bit
The stop bit is a mark level of 1 bit or more. With "space" having been detected on
detection of a stop bit, framing error takes place.