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Four-wire multidrop
network
Internal resistor
termination
Connecting your Matrox 4Sight-II unit to a multidrop network
You can use the serial port to connect your Matrox 4Sight-II unit to a multidrop
network. This is a convenient means to connect your unit to multiple devices that
are already connected to each other through this network.
If you have configured the bottom connector to the RS-422/RS-485 standard, the
Matrox 4Sight-II unit can be connected to a four-wire multidrop network. When
your unit is connected to this type of network, it acts as the master, and all other
devices connected to the network act as slaves.
When you are using a device connected to a multidrop network, the signals sent
by your device can sometimes become distorted. The distortion is often the result
of reflections caused by a signal that is not completely absorbed by the receiver.
On Matrox 4Sight-II, you can activate internal resistor termination to eliminate
distortion caused by these reflections. To activate resistor termination on your
unit, connect pins 8 and 9 of the DB9 cable together. For more information on
the pinouts for the serial ports, see the Serial port connectors section in the Technical
reference appendix.
I/O interfaces
75
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