
Serial versus parallel
\Tx
**]
\Τχ
IRX
Rx]
Tx
1
ΓπΓ
Rx
OR
Rx 1
Tx
1
Figure
5.2 (a)
Simplex,
(b)
Duplex and
(c)
Half-Duplex modes
of data transmission
Parallel-serial conversion
When a serial data link is used, for example between two
computers, the format used within each computer has
to be converted into a serial format in order to use the
single line data path between the devices. There are a
number of dedicated LSI chips available for this func-
tion. Some of these will now be discussed, in just
sufficient detail to give an insight into the features that
they incorporate. Some of the mnemonics used may be
familiar:
• UART universal asynchronou ...