Matrox Electronic Systems 4SIGHT-M - Manual (Page 63)

I/O interfaces 63
RS-422 and RS-485 can support multiple devices, at faster rates and farther
distances. In addition, data communication is differential.
For more information on the pinouts for the serial ports, see the Serial port
connectors section in the Technical reference appendix.
Connecting your Matrox 4Sight-M unit to a multidrop network
You can use either serial port to connect your Matrox 4Sight-M 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.
Four-wire multidrop
network If you have configured the bottom connector for the RS-422/RS-485 standard,
the Matrox 4Sight-M unit can be connected to a four-wire multidrop network.
Internal resistor
termination 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.
D
A
B
R
A
B
Rt
D
A
B
R
A
B
D
A
B
R
A
B
D
A
B
Rt R
A
B
TX
RX
ENABLE
TX
RX
ENABLE
TX
RX
ENABLE
D Driver -
Circuit ground or
circuit common
R - Receiver
-
MASTER
SLAVE SLAVE
SLAVE
UP TO 4000 FT
SUPPORTED BY MATROX 4SIGHT-M
Use the dip switch to
enable or disable the
resistor
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