Datasheet

LTC2870/LTC2871
33
28701fb
For more information www.linear.com/LTC2870
Figure45. RS232 Extension Cord Using RS232 to RS485 Conversion
Figure46. RS485 Full-Duplex Network
Typical applicaTions
28701 F42
DX232
DX485
CH2
TE485
V
L
RX485
RX232
H/F
LB
RX485
RX232
H/F
LB
GND GND
LTC2871 LTC2871
V
L
DX232
DX485
CH2
TE485
RIN1
RO
DIN1
DOUT1
RXIN
RS485
UP TO 4000 FT
CAT5e CABLE
RS232
DRIVER
OUT
RXOUT
RS232
DRIVER
IN
B
A
ROUT1
DI
DOUT1
DI
ROUT1
RIN1
DIN1
RO
120Ω
120Ω
Z
Y
120Ω
120Ω
B
A
Z
Y
28701 F43
LTC2870/LTC2871
120Ω
LTC2852
SLAVE
SLAVE MASTER
LTC2855
120Ω
TE485 TE
V
L
3.3V
120Ω
LTC2852
SLAVE
V
CC
= 3V to 5.5V, V
L
= 1.7V to V
CC
. Logic input pins not shown are tied to a valid logic state. External Components not shown.
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