Digital I/O 1&2
Each I/O port is capable of being used in one of two different configurations; Digital Input, and Digital
Output. These modes of operation can be configured in the built in setup pages of the WACI NX or via
RPC commands.
Digital Input
The Digital Input is used to read a digital voltage level. It can read 0V (=0) or 3V (=1). Higher voltages
are clamped to 3V. The digital input is perfect for applications requiring simple on/off detection such a
contact switch. By default the port is high impedance for the most flexibility. The setup page can also
allow a pull-up configuration. If the port is left as is then the device connected to the digital input must
supply the high and low voltages.
You can see the state of the Digital Input port using the DIO diagnostic page (see Digital I/O Diagnostics,
) or through an RPC method call (see Digital I/O Methods, page
).
Digital Output
The Digital Output is used as an open drain and can sink up to 200mA. Setting the port to 0 will leave
sink the input to ground. Setting the port as a 1 will put the port into a high impedance state. The digital
output can be used for triggering relays, LEDs, or any device that will not require more then 200mA of
current.
You can change the state of the Digital Output port using the DIO diagnostic page (see Digital I/O
Diagnostics, page
) or through an RPC method call (see Digital I/O Methods, page
).
I/O GROUND Line
To operate properly, the device connected to the input port must be connected to both the GND line of the
connector block as well as one of the two input ports.
LED Indicators for I/O Ports (1&2)
The LEDs indicate that the voltage is on the port. It will be either on (voltage present) or off (no voltage
or less than 1V).
IR Ports
The two (2) IR ports on the NX-22 are used to send infrared commands to devices that can be controlled
using a standard IR remote control. To control a device, connect one of the IR emitters to the IR sensor of
the device to be controlled. In addition the IR port can be used a one way RS-232C (TX only) at rates up
to 115k.
To program the NX-22 to send IR commands, you’ll need to download one of the device appropriate
.WIR files, or use the IR Learner to learn the remote for the device.
Summary of Contents for WACI NX-22
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