LSIS XBL-C41A - Page 178

Appendix 1 Definition of Terms
A-3
(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.
01001101
01234567
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
Pa
rity 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