Datasheet

LTC2870/LTC2871
29
28701f
Figure 42. RS232 Extension Cord Using RS232 to RS485 Conversion
Figure 43. 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
ROUT1
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
120
120
Z
Y
120
120
B
A
Z
Y
28701 F43
LTC2870/LTC2871
120
LTC2852
SLAVE
SLAVE MASTER
LTC2855
120
TE485 TE
V
L
3.3V
120
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.