LTC2803 LINER [Linear Technology], LTC2803 Datasheet - Page 16

• Manufacturer Part Number: LTC2803
• Description: Multiprotocol Transceiver
• Manufacturer: LINER [Linear Technology]

FuncTion Tables
LTC2872
Table 5. RS485 Driver Mode for a Given Port (485/232 = 1, TE485 = 0)
Table 6. RS485 Receiver Mode for a Given Port (485/232 = 1, LB = 0)
Table 7. RS485 Termination for a Given Port (485/232 = 1)
Table 8. RS485 Duplex Control for Given Port (485/232 = 1)
Table 9. Loopback Functions for a Given Port
16
LB
DXEN
0
1
1
H/F
X
0
1
1
TE485
0
1
RXEN
1
0
0
0
X
0
1
1
X
RXEN
RS485 DRIVER OUTPUTS
X
1
0
DY
X
0
1
X
Inputs Open or Shorted Together (DC)
DZ
Y, Z
Y, Z
X
X
0
1
Loopback (RA = DY, RB = DZ)
A–B (NOTE 5)
Thermal Fault
CONDITIONS
< –200mV
> 200mV
TRANSCEIVER MODE
No Fault
No Fault
No Fault
X
X
H/F, LB
Not Loopback
Not Loopback
X
X
X
X
RS485 RECEIVER INPUTS
A, B
Y, Z
Thermal Fault
CONDITIONS
No Fault
No Fault
No Fault
125kΩ
125kΩ
Y
0
1
Thermal Fault
CONDITIONS
No Fault
No Fault
No Fault
No Fault
R(A TO B)
125kΩ
125kΩ
120Ω
120Ω
Hi-Z
Hi-Z
Z
1
0
Hi-Z
Hi-Z
RA
0
1
1
R(Y TO Z)
120Ω
Hi-Z
Hi-Z
Hi-Z
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