CO
2
SENSOR
Technical Guide
8
Troubleshooting
Setting the Sensor Address Switch
LED ON/OFF Push-Button Operation for Setting
Address
The LED ON/OFF Push-Button is used to set the CO
2
Sensor’s address.
The LED ON/OFF Push-Button is located on the Sensor’s board and is
only visible by removing the back cover. See location in
Figure 6
. The
default addresses are as follows:
•
Space or Return CO
2
Sensor = Address 1 (Default)
•
Address 2 is reserved.
•
Open addresses for Custom Applications = Addresses 3-10
To set the address, follow these instructions:
1. Power up the VCM-X Controller that the Sensor is plugged
into.
2. Press the LED ON/OFF Push-Button for 5 seconds until the
LEDs turn off .
3. Then press the push-button the number of times that repre-
sents the address. Press once for address 1, press twice for
address 2, etc.
4. The address range can be set to 1 (default) and from 3 to 10.
5. To verify that the correct address has been entered, refer to
the STATUS LED information below.
The board address is stored in nonvolatile memory. Once the address is
set, the address will be saved after loss of power.
Using LEDs to Troubleshoot
LEDs are available for troubleshooting the CO
2
Sensor. The Front LED
is visible through the front cover of the CO
2
Sensor. See
Figure 7
for
location. The other LEDs are located on the Sensor’s board and are only
visible by removing the back cover. See
Figure 6
for locations.
LED ON/OFF Push-Button
This button is located on the CO
2
Sensor’s board. See
Figure 6
. This
button is initially set for “LEDs OFF.” Push this button to enable/disable
the LEDs. Pushing this button ON will make the Front LED light up.
This LED is also used for setting the address.
Front LED
When the LEDs are turned on, a green LED will be visible through the
front plastic cover of the CO
2
sensor. See
Figure 7
. The Front LED
will blink whenever a CO
2
sample is taken. A sample is taken every
30 seconds.
STATUS LED
Initially, the STATUS LED blinks fast for 30 seconds. It then stays on
and blinks the board address whenever a CO
2
sample is taken. A CO
2
sample is taken once every 30 seconds.
COMM LED
The COMM LED blinks on whenever communications are sensed.
Altitude Correction
Altitude correction can be confi gured using one of our operator inter-
faces. The altitude can be confi gured at a value of 0-15,000 feet. The
default is 500 feet.
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