Datasheet 搜索 > 接口芯片 > ADI（亚德诺） > ADM3491AR-REEL7 数据手册 > ADM3491AR-REEL7 产品设计参考手册 4/12 页
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ADM3491AR-REEL7 产品设计参考手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
接口芯片
封装:
SOIC-14
描述:
3.3 V摆率限制，半双工和全双工， RS - 485 / RS -422收发器 3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers
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ADM3491AR-REEL7数据手册
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of 12 Go
若手册格式错乱，请下载阅览PDF原文件
AN-960 APPLICATION NOTE
Rev. 0 | Page 4 of 12
RO
RE
DE
A
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.
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.
DI
GND
B
R
T
R
T
R
D
RO
RE
DE
A
DI
GND
B
R
D
RO DE DI
GND
R
D
AB
RE RO DE DI
GND
R
D
AB
RE
. . . .
07395-003
Figure 3. Half-Duplex RS-485 Bus Configuration
RO
RE
GND
R
T
A
V
SL
R
T
D
RO
RE
DE
DI
GND
R
R
D
RO DE DI
GND
R
D
AB
ZY
RE RO DE DI
GND
R
D
AB
ZY
RE
. . . . . . .
Y
Z
A
B
A
B
Z
Y
07395-004
DE
DI
SLAVE SLAVE
EMASTER
Figure 4. Full Duplex RS-485 Bus Configuration
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