AN-960 データシートの表示（PDF） - Analog Devices
部品番号
コンポーネント説明
一致するリスト
AN-960 Datasheet PDF : 12 Pages
| |||
AN-960
HALF-DUPLEX RS-485
Half-duplex RS-485 links have multiple drivers and receivers on
the same signal path. This is the reason why RS-485 transceivers
must have driver/receiver enable pins enabling only one driver
to send data at a time. See Figure 3 for a half-duplex bus config-
uration. This configuration is also known as a 2-wire RS-485
network connected in a multipoint configuration and allows for
data transmission in both directions, but only in one direction
at a time.
APPLICATION NOTE
FULL-DUPLEX RS-485
Figure 4 shows an example of an RS-485 bus connected in
a full-duplex bus configuration. This configuration is also
known as a 4-wire RS-485 network connected in a multipoint
master/slave configuration. Full-duplex RS-485 allows for
simultaneous communication in both directions between
master and slave nodes.
RO
R
RE
A
RT
DE
B
DI
D
GND
A
B
A
B
R
RO
A
RE
RT
DE
B
D
DI
GND
R
....
R
D
GND
D
GND
RO RE DE DI
RO RE DE DI
Figure 3. Half-Duplex RS-485 Bus Configuration
MASTER
A
RO
R
RT
RE
B
DE
Z
DI
D
Y
GND
A
B
Z
Y
A
B
Z
Y
SLAVE
DE
Y
D
DI
Z
A
RT
R
RO
B
RE
GND
GND
SLAVE
R
.......
R
D
GND
SLAVE
D
RO RE DE DI
RO RE DE DI
Figure 4. Full Duplex RS-485 Bus Configuration
Rev. 0 | Page 4 of 12
Share Link: 