Datasheet

Data Sheet ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Rev. E | Page 15 of 20
LINE LENGTH vs. DATA RATE
The RS-485 and RS-422 standards cover line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 36.
B
A
R
D
RO
RE
DI
DE
ADM3483/
ADM3485
ADM3483/
ADM3485
ADM3483/
ADM3485
ADM3483/
ADM3485
B
A
R
D
RO
RE
DI
DE
B
A
R
D
RO
RE DI
DE
B
A
R
D
RO
RE
DI
DE
05524-022
MA
X
IMUM NUMBER OF TRANSCEI
V
ERS ON BUS = 32
R
T
R
T
NOTES
1. R
T
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
V
CC
R1
R2
Figure 32. ADM3483/ADM3485 Typical Half-Duplex RS-485 Network
R
D
RO
RE
DI
DE
ADM3491
ADM3491
A
B
Z
Y
05524-090
R
D
RO DIDE
A B Z Y
RE
R
D
RO
DI
DE
ADM3491
MASTER
SLAVE
SLAVE
A
B
Z
Y
RE
MAXIMUM NUMBER OF NODES = 32
ADM3491
R
D
RO DIDE
A B Z Y
RE
SLAVE
NOTES
1.
R
T
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
R
T
R
T
R
T
V
CC
R1
R2
R
T
V
CC
R1
R2
Figure 33. ADM3491 Typical Full-Duplex RS-485 Network
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.