Matrox Morphis Evo Installation And Hardware Reference page 43

Four-wire
multidrop network
(not supported)
Master
D
Always
enabled
R
Always
enabled
The following illustrates a typical RS-485 four-wire multidrop network that
Matrox Morphis Evo does not support.
Four-wire multidrop network
NOT SUPPORTED by Matrox Morphis Evo
A
Rt
B
A
Rt
B
Slave
A
D
B
TX
Enable
A
RX
R
B
Connecting devices to the Matrox Morphis Evo I/O module
Up to 4000 ft
Slave
A
D
B
TX
Enable
A
RX
R
B
Slave
A
Rt
R
B
TX
Enable
RX
A
Rt D
B
D Driver -
R - Receiver
Circuit ground or
-
circuit common
43