Computer Hardware User Manual

64 Chapter 5: Matrox 4Sight-M hardware reference
On Matrox 4Sight-M, you can activate internal resistor termination to eliminate
distortion caused by these reflections. To connect internal resistor termination on
your unit, adjust the internal dip switch accordingly.
❖ Note that on a Matrox 4Sight-M unit in a multidrop network, internal resistor
termination is available exclusively for the receivers.
Two-wire multidrop
network
The following illustrates a typical RS-485 two-wire multidrop network that
Matrox 4Sight-M cannot support.
Note that because the driver and receiver for the Matrox 4Sight-M serial port are
always enabled, the unit cannot be connected to a typical RS-485 two-wire
multidrop network shown below.
D
R
A
B
A
B
TX
RX
ENABLE
D
R
A
B
A
B
TX
RX
ENABLE
D
R
A
B
A
B
TX
RX
ENABLE
D
R
A
B
A
B
TX
RX
ENABLE
Rt
Rt
TERMINATION RESISTORS AT BOTH ENDS ONLY
UP TO 4000 FT
D Driver-
Circuit ground or
circuit common
R
-
Receiver
-
Use the dip switch to
enable or disable the
resistor
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