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A p p e n d i x G : U s i n g t h e I / O s i g n a l s o f M a t r o x I r i s E - S e r i e s
C o n n e c t i n g t o a T T L d e v i c e
To connect your Matrox Iris E-Series to a TTL device, you must first connect an
external resistor pull-up between them. The external resistor pull-up is needed
because TTL devices expect to be connected to a device that can provide power
(a sourcing device) and your Matrox Iris E-Series is a sinking device. Note that
the voltage expected differs between a PNP-compatible PLC device and a TTL
device.
You should connect an output signal of your Matrox Iris E-Series and the device
input to an external resistor pull-up. In addition, connect the ground of the TTL
device and the ground of your Matrox Iris E-Series to a common ground.
The external resistor pull-up assures that when the output is disabled (off ), the
external resistor will pull-up the device's input to a positive voltage (+V).
Therefore, the device input is "on" when your Matrox Iris E-Series output is "off",
and vice-versa.
Matrox Iris
input and
output
connector
13
24
20
7
14
1
GND
Power
+5 V
source
External
resistor
pull-up
output signal
GND
TTL device
device input
GND
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