In your Control Panel, double click on "Voltage Input":

In your Control Panel, double click on "Current Input":

In your Control Panel, double click on "Digital Input":

In your Control Panel, double click on "Frequency Counter":

Before you open a Phidget channel in your program, you can set these properties to specify which channel to open. You can find this information through the Control Panel.

1. Open the Control Panel and double-click on the red map pin icon:

2. The Addressing Information window will open. Here you will find all the information you need to address your Phidget in your program.

See the Phidget22 API for your language to determine exact syntax for each property.

This mode measures an input between 0V and 5V. To connect your 0-5V sensor to the DAQ1400, wire the sensor to the terminals as pictured in the diagram. You may need to refer to the datasheet for your sensor to determine which wire is which.

This mode is designed to interface a 4-20mA sensor, which is a common industrial standard. To connect your 4-20mA sensor to the DAQ1400, wire the sensor to the terminals as pictured in the diagram.

Even though this mode is intended for this specific purpose, you can also use it as a general-purpose current sensor, in which case it can measure current values between 0.5mA and 20mA (Measuring below 0.5mA is not recommended).

Some industrial sensors have a simple true/false value which can be read by a digital input. Many proximity or movement sensors have this kind of output. It is common that these sensors will require a 12V or 24V power supply, so other Digital Input Phidgets are not a complete solution in this case. A digital sensor will either be PNP or NPN:

• An NPN sensor will switch the sensor line to ground whenever the sensor activates.
• A PNP sensor will switch the sensor line to power whenever the sensor activates.

Normally, you'd need a different kind of digital input to interface these two types of sensors. Luckily, the DAQ1400 can read either one; all you have to do is set the Input Mode property to the correct type (see the Phidget22 API for details). To connect your digital sensor to the DAQ1400, wire the sensor to the terminals as pictured in the diagram.

Sensors that measure using rotation such as flow meters or anemometers usually have a pulse output. For example, a flow sensor might send a 5V pulse down the line every time the turbine makes a full rotation. Using this information with timestamps, you can calculate the turbine speed. While you could theoretically use a Phidget with a Digital Input to read this kind of signal, most digital input boards are not designed to read pulse signals that change this frequently, so they will miss pulses and calculate the wrong speed. The DAQ1400 is specially designed to read these high frequency pulse signals when in Frequency Input mode.

To connect your sensor to the DAQ1400, wire the sensor to the terminals as pictured in the diagram.

If your sensor frequency is faster than 600Hz, you may seem to be 'maxing out' the DAQ1400. This is because the pull-down resistance is too weak to pull the signal down. To strengthen the pull-down, put a 10KΩ resistor across the Digital and Gnd terminals.