8 LCX 890 Installation Guide
Digital Inputs
The first 16 inputs on all LCX 890 controllers are digital, for switches.
The controller can read the settings of these switches.
All digital inputs have an input impedance of 220KΩ referenced to
5.000 V.
Universal Inputs
The last eight inputs (not including the EMX 170 port) on the LCX 890
or LCX 898 (17 through 24) are universal. The last eight inputs on the are
universal. Universal inputs are for any type of sensor, such as thermistors,
motion sensors, and switches.
Below are the requirements of each universal input:
• Voltage Range—0 to 5.115 V
• Resolution—0.005 V
• Accuracy—+/–0.015 V
• Maximum Pulse Frequency—5 Hz at a duty cycle of 50% with a
minimum pulse width of 100 ms
• Input Impedance—10KΩ referenced to 5.120 V
• Filtering—Corner Frequency at 15 Hz, –20 db/decade
• Over-Voltage Protection—24 VAC RMS or 24 VDC indefinitely on
any single channel; +/–1500 V transient for 50 µs on all channels
• Calibration—Permanent (factory)
EMX 170 Inputs
If you have an EMX 170 on the EMX 170 port, it is an additional input,
numbered 25.
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