LSIS XGL-C22A, Руководство пользователя, Страница: 268 / 299

Appendix
A-2
(b) Parallel transmission
This type is used in printer, etc., which transmits data in unit of 1 byte, so the speed is high and the accuracy of data is reliable.
However, the longer the transmission distance is, the higher the cost of installation is geometrically.
0 1 0 0 1 1 0 1
0 1 2 3 4 5 6 7
송신 수신
1
0
1
1
0
0
1
0
(3) Asynchronous communication
This communication type transmits characters one by one synchronously in serial transmission. At this time, synchronous signal
(Clock, etc.) is not transmitted. Character code is transmitted with a start bit attached to the head of 1 character, and it is finished
with a stop bit attached to the tail.
E
N
Q
(05H)
S
T
O
P
S
T
A
R
T
P
A
R
I
T
Y
K
S
T
O
P
P
A
R
I
T
Y
S
T
A
R
T
O
S
T
O
P
P
A
R
I
T
Y
S
T
A
R
T
R
S
T
O
P
P
A
R
I
T
Y
S
T
A
R
T
E
S
T
O
P
P
A
R
I
T
Y
S
T
A
R
T
※
For transmitting KOREA
Transmission Direction
Start Bit Stop Bit Data Bits Parity Bit
E
O
T
(04H)
S
T
O
P
S
T
A
R
T
P
A
R
I
T
Y
A
S
T
O
P
P
A
R
I
T
Y
S
T
A
R
T
TX
RX