LSIS XBE-DC08A, Руководство пользователя, Страница: 24 / 1284

Sy
ste
m
Chapter 1 Introduction
1-8
(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