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LTC1387
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 14. Full-Duplex RS232 (1-Channel), Half-Duplex RS485
R
A
R
B
D
Y
D
Z
A
B
Y
Z
R
A
R
B
D
Y
D
Z
/SLEW
ON
V
CC
RXEN
DXEN
485/232
CONTROLLER
DX
RXEN
DXEN
MODE
INTERFACE
A
B
Y
Z
RS232
RS485
RS232 RS485
RS485
RS485
RS232 RS485 SHUTDOWN
MODE MODE MODE
RXEN = 1 RXEN = 1 RXEN = 0
DXEN = 1 DXEN = 1 DXEN = 0
MODE = 0 MODE = 1 MODE = X
1387 • F15
LTC1387
RX
RXD
TXD
Figure 15. Full-Duplex RS232 (1-Channel), Full-Duplex RS485/RS422
Figure 16. Full-Duplex RS232 (2-Channel), Full-Duplex RS485/RS422 with SLEW Control
R
A
R
B
D
Y
D
Z
A
B
Y
Z
R
A
R
B
D
Y
D
Z
/SLEW
ON
RXEN
DXEN
485/232
CONTROLLER
DX1
DX2/SLEW
ON
RXEN
DXEN
MODE
INTERFACE
A
B
Y
Z
RS232
RS485
RS232 RS485
RS485
RS485
RS232 RS485 SHUTDOWN
MODE MODE MODE
ON = 1 ON = 1 ON = 0
RXEN = 1 RXEN = 1 RXEN = 0
DXEN = 1 DXEN = 1 DXEN = 0
MODE = 0 MODE = 1 MODE = X
1387 • F16
LTC1387
RX1
RX2
RXD
RS232
CTS
TXD
RS232
RTS
R
A
R
B
D
Y
D
Z
A
B
Y
Z
R
A
R
B
D
Y
D
Z
/SLEW
ON
V
CC
RXEN
DXEN
485/232
CONTROLLER
DX
RXEN
DXEN
MODE
INTERFACE
A
B
RS232
RS232
RS485
RS485
RS232 RS485 RS485 SHUTDOWN
MODE TRANSMIT MODE RECEIVE MODE MODE
RXEN = 1 RXEN = 0 RXEN = 1 RXEN = 0
DXEN = 0 DXEN = 1 DXEN = 0 DXEN = 0
MODE = 0 MODE = 1 MODE = 1 MODE = 0
1387 • F14
LTC1387
RX
TXD
RXD
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