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DARK/LIGHT EVENTS
The LMCP can be programmed to turn relays on or off based on when it becomes dark outside (night) or light (day). You can program
up to 32 separate dark/light events, and each event is assigned to a group. For each event, you can select whether to base the change
from dark to light and light to dark on either an astronomical calculation of sunrise and sunset, or from a photocell connected to an
LMIO-301. You can have multiple LMIO-301s connected to the network and assign different groups to different LMIO-301s, or you can
have a singe LMIO-301 but assign different light thresholds to different groups.
NOTE: You can only select a single LMIO-301 if programming with the LMCT-100. To use multiple LMIO-301s, you must program with
the LMCS-100 software.
Each Dark/Light event has a Dark parameter and Light parameter. For each parameter you can select whether the relays belonging to
the group will turn “On”, turn “Off”, or “Do Nothing”. So, while a typical application would be to turn lights on when it gets dark outside,
you could also choose to have a specific group of lights turn off when it gets dark.
Astronomical Dark/Light Switching
When you use astronomical control, of dark/light events, Dark is triggered by sunset and Light is triggered by sunrise, based on your location.
Additionally, you have the ability to select More Light or Less Light. This parameter, in conjunction with a Time parameter,
determines when the event will be triggered in relation to the actual sunrise and sunset time. More/Less light refers to the amount of
“daytime”/”nighttime”. The time parameter can be selected in two minutes increments, and is equally divided between before and after
the actual sunrise/sunset time. The More Light parameter acts as if the time between sunrise and sunset was longer (more daytime),
and Less Light acts as if there were less time between sunrise and sunset (less daytime). So if you select Less Light with a time
value of 20 minutes, the Dark event will trigger 10 minutes before sunset and the Light event will trigger 10 minutes after sunrise. The
diagram below shows the exact time the events will be triggered based more or less light with different time values.
Dark/Light Event Triggering
Dark
aka Sunset
aka Dusk
~Noon ~Noon~Midnight
Light
aka Sunrise
aka Dawn
More Less Less More
me
07:2517:57
10
Min
15
Min
15
Min
10
Min
Astro “More 30 min”
Dark ON – Lights turned on at 18:22
Light OFF – Lights turned off at 07:00
Astro “Less 20 min”
Dark ON – Lights turned on at 17:57
Light OFF – Lights turned off at 07:
Ex: Dallas Astro on 2/9/15
Sunset = 18:07
Sunrise = 07:15
18:22
Amount of Daytime
Daytime / Nighttime Nighttime / Daytime
07:00
Switching Based on Input From an LMIO-301 and Photocell
If you control dark/light events from an LMIO-301, you can select the amount of light, in footcandles that will trigger the events. If the
light rises above the footcandle amount, a light event will trigger, and if it drops to the exact footcandle amount, a dark event will trigger.
A Time Delay feature allows you to set the number of minutes after the specified footcandle amount is reached before triggering the
event. This helps prevent unwanted event triggering, for example, when the light temporarily gets darker because of a cloud passing
over the sun.
CONNECTING SWITCHES, SENSORS, PHOTOCELLS, AND OTHER DLM ACCESSORY DEVICES
Accessory Device Support
Each Cat5 Local DLM Network port, labeled A and B, supports a maximum of 48 communicating devices. Note that the panel itself
counts as one device in each network, so this allows for a maximum of 94 possible accessory devices per panel.
The maximum cable run for a network depends on the number of devices. 150’ of cable is allowed per device; a two device network is
allowed 300’, 3 devices 450’ etc., up to 1,000’ maximum. For example a network that has 6 devices supports a maximum of 900’ of total
CAT5e cabling with no minimum or maximum spacing between devices. The first five 5 devices could be separated by a 10’ LMRJ (4
total) and the first switch could then be 860’ from the first panel. Since the maximum length is 1000’ for the network, adding additional
accessory devices beyond 6 total will increase the length by 100’ more, no matter how many devices are added.
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