Short Throw Lift 220V
Motorized tabletop screen — installation, control, and maintenance manual
Overview
The Short Throw Lift 220V is a floor-rising motorized projection screen that can sit on a cabinet or hang flat against a wall. This guide covers safety, accessories, anatomy, both installation scenarios, all five control methods, limit-height adjustment, electrical specifications, fabric maintenance, and common troubleshooting.
Safety Precautions
What's in the Box
Verify all of the following items are present before starting installation:
Included accessories — verify against the list below
- Power Cable — 1 pc
- IR Remote (Model AC-127) — 1 pc
- IR Receiver — 1 pc
- USB Wireless Trigger — 1 pc
- Adjustable Mounting Bracket — 2 pcs (optional, for wall install)
- Limit Adjustment Tool — 1 pc
- Allen Key — 1 pc
- M5 Anti-Slip Nuts — 6 pcs
- ø5 × 40 mm Round Head Self-Tapping Screws — 10 pcs
- Plastic Expansion Tubes — 10 pcs
- Brush — 1 pc (for ALR fabric cleaning)
- Socket Screwdriver (10 mm) — 1 pc
- User Manual — 1 pc
Screen Anatomy
Main components and ports
Key parts
- Spring-Loaded Cover — opens when the screen extends, closes when it retracts.
- Fabric Support Bar, Upper / Lower Support Arms, Joint — the four-bar linkage that keeps fabric tension constant.
- Tab Tension — keeps the fabric edges flat.
- Casing & End Cap — the body that holds the motor, mechanism, and electronics.
- Level Adjustment Nob — under-casing screws for fine-tuning tilt.
Connection points (power-port side)
- Power Port
- Manual Control Button
- External Infrared Receiver jack
- 8P8C Communication Port (RJ45) — used for dry contact and RS485/RS232
Tabletop Installation (Scenario 1)
Lay the screen flat on the cabinet with at least 4 mm clearance between the casing and the wall.
Use the IR remote or manual button to raise the screen all the way.
The nobs are located on the underside of the casing — turn them to tilt the screen forward or backward until the fabric hangs vertically.
Tilt the screen using the Level Adjustment Nobs under the casing; maintain ≥4 mm to the wall.
Wall Installation (Scenario 2)
Bracket spacing by screen size
The two adjustable brackets must be spaced according to screen size. Use the recommended Distance A:
| Size (diagonal, 16:9) | Distance A (mm) |
|---|---|
| 92" | 1740 |
| 100" | 1920 |
| 110" | 2020 |
| 120" | 2240 |
| 133" | 2410 |
Measure Distance A along the wall, centered to where the screen will hang.
Step-by-step
Measure the total casing length and the desired height of the bottom of the screen. Mark a horizontal line at that height. The top edge of each adjustable bracket should align with this line. Reference Distance A for bracket spacing.
Drill four holes per bracket. Insert plastic expansion tubes, place each bracket flush against the wall, and secure with ø5 × 40 mm self-tapping screws.
The T-Nuts come pre-installed for front installation. For reverse installation, move them to the Reverse Mounting Holes. Slide the casing onto the brackets, position horizontally, and tighten the T-Nuts from underneath to lock.
Use the Allen key to make small tilt corrections (±1.5° adjustable) until the fabric hangs square.
T-Nut adjustment and the two installation orientations (front vs. reverse).
Control Methods
The Short Throw Lift 220V supports five control methods. The IR remote is paired at the factory; the others may require a one-time setup.
The Manual Control Button sits on the power-port side of the casing. Each press advances through the cycle below:
Press the button to cycle: Up → Stop → Down → Stop.
Remote layout — model AC-127.
Buttons
- Up — opens the decorative door and extends the screen to the set position.
- Stop — pauses motion.
- Down — retracts the screen and closes the decorative door.
- JOG UP / JOG DOWN — small step adjustments.
Pairing / Unpairing
The remote is paired at the factory. To re-pair:
- Disconnect the screen from power for at least 10 seconds, then reconnect.
- Within 10 seconds of reconnecting, press Up and Stop simultaneously.
- The motor will rotate forward, then backward, once — pairing succeeded.
Specs
- Frequency: 868 MHz
- Range: ~15 m
- Batteries: 2 × CR2032, 3 V
- IR sensor acceptance angle: 30°
Use the 8P8C (RJ45) port. Pins 4, 5, 7, and 8 are the dry-contact control lines (numbered from the left side of the connector):
RJ45 pinout and command assignment for dry contact.
| Pin | 4 | 5 | 7 | 8 |
|---|---|---|---|---|
| Function | Common | Up | Stop | Down |
The USB Wireless Trigger pairs with a projector's USB trigger output. When the projector powers on remotely, the screen extends automatically; when the projector powers off, the screen retracts. The trigger is pre-programmed at the factory.
USB Wireless Trigger — the small button is the Learning Button.
Pairing
- Disconnect power from the screen.
- Power on the USB Wireless Trigger.
- Power on the screen.
- Within 10 seconds, briefly press the Learning Button.
- Pairing complete.
Reverse extend / retract behavior
- Power on the USB Wireless Trigger.
- Press and hold the Learning Button for 5 seconds.
- The indicator light changes red → blue (or blue → red). Command swap complete.
The 8P8C (RJ45) port doubles as the serial control output. Pins 1 and 2 are the control lines:
- RS485: Pin 1 = D−, Pin 2 = D+
- RS232: See wiring diagram below for 8P8C → DB9 (P1) — Pin 2 → TXD (DB9 pin 3), Pin 1 → GND (DB9 pin 5).
RS232 wiring from 8P8C (RJ45) to DB9 (P1).
Port settings
| Baud rate | 2400 |
|---|---|
| Data bits | 8 |
| Parity | None |
| Stop bits | 1 |
| Flow control | None |
Example serial port configuration (Windows).
Hexadecimal control codes
| Command | Hex |
|---|---|
| Retract | FF EE EE EE DD |
| Stop | FF EE EE EE CC |
| Extend | FF EE EE EE EE |
| Set address (some controllers) | FF EE EE EE AA |
Limit Height Adjustment
If the installation requires a different retraction or extension height than the factory default, use the supplied Limit Adjustment Tool through the Limit Adjustment Hole on the casing.
Limit Adjustment Hole and the two knob locations on the motor.
Green knob — retraction height (lower limit)
- Clockwise: increase limit (raise)
- Counter-clockwise: decrease limit (lower)
Yellow knob — extension height (upper limit)
- Clockwise: decrease limit (lower)
- Counter-clockwise: increase limit (raise)
Electrical Specifications
| Voltage / Frequency | 110 V / 60 Hz or 220 V / 50 Hz (refer to the label on the product) |
|---|---|
| IR Remote Voltage | 3 V (2 × CR2032) |
| IR Remote Frequency | 868 MHz |
| IR Remote Range | ~15 m |
| Serial: Baud rate | 2400 |
| Serial: Data / Parity / Stop / Flow | 8 / None / 1 / None |
| Max RS485/RS232 wiring loop resistance | < 20 Ω |
Maintenance
Ultra short throw ALR fabric
- Use the supplied brush. Brush lightly and horizontally, along the texture of the screen, to lift dust and fine particles.
- For light-colored smudges, lift them with low-tack, residue-free tape.
Non-ALR regular throw fabric
- Use clean water with a mild detergent to gently wipe stains. Do not use corrosive cleaners.
- Only retract the screen once the fabric is completely dry.
Troubleshooting
- Swap the two control lines. This is the most common fix.
- Confirm baud rate 2400, 8 data bits, no parity, 1 stop bit, no flow control.
- Check that wiring loop resistance is under 20 Ω.
- Re-route the cable away from motors, fluorescent fixtures, and other strong interference sources.
- Confirm the indicator light on the remote flashes when a key is pressed. If not, replace the CR2032 batteries.
- Re-pair the remote: power-cycle the screen, then within 10 seconds press Up + Stop together. Watch for the motor to jog forward then backward.
- If using the external IR receiver, confirm it is plugged into the IR Receiver jack and that the receiver eye has a clear line of sight within ~15 m and 30°.
The black grid fabric surface is carved with an optical grating — angled micro-louvers that reflect a projector beam coming from below (ultra short throw) while absorbing ambient light from above. Side-incoming ambient light is rejected less, so place the projector below the screen and avoid bright side lighting.
Optical grating: UST projector light from below is reflected to the viewer; overhead ambient light is absorbed.
The screen uses a splicing process. A small curvature at the splice line is normal — it comes from the upper and lower tension sources — and does not affect the projected image.
Lower black drop ideal range: 250 – 350 mm. If the lower drop is outside this range, fabric flatness can suffer.
- Confirm at least 4 mm of clearance between the casing and the wall behind it.
- Fully extend the screen, then turn the Level Adjustment Nobs under the casing in small increments until the fabric hangs vertically.
- If wall-mounted, use the Allen key to adjust the bracket tilt within the ±1.5° range.
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