Setting up Parameters via the Keypad
Auxiliary Input/Output
EVM Series User Manual
4. To return to the main menu, press On/Off/Esc twice.
Auxiliary Input/Output
Digital Output
With the digital output function, the user can connect an external device to the monitor. This can be
used to signal a specific level to turn on a notification device, an LED, or a fan motor at a specific
threshold (or set point). Once enabled, the following three are selectable parameters: a sensor, logic
setting, and threshold setting.
Sensors
When setting the Digital Output (“Digital-Out”) parameters, one of the seven selectable sensors is used
to trigger the output of the external device which includes:
RH (relative humidity), CO
2
(Carbon Dioxide), Temp (Temperature), PM (particulate matter), PID
(for measuring VOCs), Toxic gas (i.e, CO), and Dew Point.
NOTE: Air Velocity cannot be selected as a sensor.
Logic and Threshold
There are four selectable “Logic” types which is used in combination with the Threshold field to trigger
on and off the external device. These are explained in the table below.
NOTE: The digital output is an open collector output and as such requires the user to install a pull-
up resistor.
The output will assert an active high pulse for approximately 50 msec
when the threshold is exceeded.
The output will assert an active low pulse for approximately 50 msec when
the threshold is exceeded.
The output will be at a logical high level when the threshold is exceeded.
The output will be at a logical low level when the threshold is exceeded.
Enter in a value to trigger the external device to turn on or off.
Table 3-3: Digital out/Logic settings
NOTE: The system maintains a hysteresis window around the threshold to prevent output chattering.
Setting or changing digital output
1. From the Start screen, select Setup menu and press Enter
.
2. Press ▼ Arrow repeatedly until Aux I/O and press Enter
.
3. Select Digital Out and press Enter
.
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