Austin LED Consultants PL-AT-TW1 Посібник із швидкого старту - Сторінка 2
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Keep Alive is the current needed to keep a PoE switch port from shutting down. Simple keep alive burns 500 mW when the
LED is off. Our Smart Keep Alive reduces this to 100 mW using a 25% duty cycle.
Use a PoE switch or injector to supply power. It can be mode B 802.3af, 802.3at or 4 pair 802.3bt for up
to 25 watts. Every 8 wire cat-5e cable can carry 2 separate PoE power sources. Lets call them PoE 1
and 2. Each PL-AT-TW1 accepts power from PoE 1 and passes PoE 2 to the output connector
PoE 1 is the power for the LED attached to this device. It can be mode A 802.3af, 802.3at or 2 pair
802.3bt for up to 25 watts.
PoE 2 is the optional power from a 802.3bt switch. It is passed thru the device to the next device in the
chain to provide power to a second PL-AT-TW1 attached to the output connector. The output RJ45
moves the mode B input to Mode A output so no crossover is required.
The device has a Switch input with a 10k pullup to 3.3v. When Open the LED is on, when closed the LED
is off. If a PWM signal is applied ( For example from a AL-WS-010v) then the LED can be dimmed. See
the AL-WS-010v for a PWM wall switch. Use a RH-253, AL-WS-M momentary switches, or use a simple
On/Off switch. Connect the switch between pins 7&8 of the output connector to create a On/Off/Dim
switching ability. If a momentary switch is used, then each press will toggle the light on/off. If PoE
power is cut and then started again – the Light will always come on. Hold the switch to cause the light
to dim. Release to keep the color that was requested.
If two PL-AT-TW1 are connected onto one CAT-5e cable to the power source, see our application note
for how to have one wall switch control 2 PL-AT-TW1
Smart Keep Alive
RJ45 connector pinout
Pin
In
1
PoE 1
2
PoE 1
3
PoE 1
4
PoE 2
5
PoE 2
6
PoE 1
7
PoE 2
8
PoE 2
PoE Power Input
PoE 1 Power Input
PoE 2 Power Input
Dimmer / Switch In
Out
PoE 2
PoE 2
PoE 2
NC
NC
PoE 2
Dim/Switch
Ground