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KB01634 - Projector Screen Control Using The AT-UHD-SW-510W and/or AT-OME-MS52W



Summary: Projector Screen Control Using The AT-UHD-SW-510W and/or AT-OME-MS52W—

The following projector screen control tips should be helpful when configuring and installing the AT-UHD-SW-510W for relay-based screen control.



Projector screens usually require a momentary low voltage contact closure for up and down control. The SW-510W/OME-MS52W includes two relay contacts, C1 and C2, for this purpose. These relays are normally open and can be set to close when the display button is pressed on the SW-510W/OME-MS52W or with an IP or RS-232 command.


The SW-510W/MS52W relays can support up to 1 A of current and up to 48 V.




Hardware Configuration

Your screen motor controller must have an external low voltage relay input. See your screen controller manual for details. You should have one wire for up, one for down, and a ground or common connection. Strip these wires appropriately and screw them into the included terminal block for the RELAY port. Be sure there are no strands shorting between the wires.


  • C1 is for lowering the screen. This contact closes when the display control button is switched on.


  • C2 is for raising the screen. This contact closes when the display control button is switched off.


After terminating your wires in the terminal block, power up your screen controller then use a multimeter to check the voltage between your wires from the motor controller before connecting them to the 510W/MS52W. Check AC and DC voltages in case of a wiring error. You should see a maximum of 48V. Your screen controller user manual may specify a control voltage that you can verify. If your meter has a current mode that supports >1 A, you can use this to verify that a maximum of 1 A will flow when you short your C1 or C2 connection to COM through the meter. Your screen should move when you do this test. Correct any errors before connecting up the 510W.


Web Interface Configuration

See the following article for more information on accessing your AT-UHD-SW-510W web interface.

In the web UI, the relay settings are on the Display page.


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"Enable Momentary Relay" will switch between a relay pulse and a relay toggle when the display button is pressed. The relay pulse duration can also be configured here. Check your screen manual for the appropriate pulse duration.


Velocity Control

You can use Velocity macros to control the relay on your AT-UHD-SW-510W/MS52W. A common use-case is to have an event macro trigger the screen when the room turns on or off.

To use a momentary pulse using external control, you will have to program a pulse as separate relay on and off commands separated by a delay:




You can use the "Set Relay" command to close the relay.




Set the delay after the on pulse before running the relay off command.




This is the completed screen down command with a 1 second momentary pulse. You can use the same type of macro for the screen up command for the room off event. Use relay 1 for that macro.


Other Control Methods

You can use the API to send relay commands over RS-232 and Telnet. You can find the API on the product page resources tab.

Use the following API command:

Relay:State:Set X Y

Where X is the relay and Y is the state, 0 or 1 for off and on. You will have to manually toggle the relay on and off with the appropriate delay to achieve a momentary pulse.


Article ID: KB01634

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