Safety precautions
- Unpack the equipment carefully and save the original box and packing material for possible future shipment.
- Follow basic safety precautions to reduce the risk of fire, electrical shock and injury to persons.
- Do not dismantle the housing or modify the module. It may result in electrical shock or burn.
- Using supplies or parts not meeting the products’ specifications may cause damage, deterioration or malfunction.
- Refer all servicing to qualified service personnel.
- To prevent fire or shock hazard, do not expose the unit to rain, moisture or install this product near water.
- Do not put any heavy items on the extension cable in case of extrusion.
- Do not remove the housing of the device as opening or removing housing may expose you to dangerous voltage or other hazards.
- Install the device in a place with fine ventilation to avoid damage caused by overheat.
- Keep the module away from liquids.
- Spillage into the housing may result in fire, electrical shock, or equipment damage. If an object or liquid falls or spills on to the housing, unplug the module immediately.
- Do not twist or pull by force ends of the optical cable. It can cause malfunction.
- Do not use liquid or aerosol cleaners to clean this unit. Always unplug the power to the device before cleaning.
- Unplug the power cord when left unused for a long period of time.
- Information on disposal for scrapped devices: do not burn or mix with general household waste, please treat them as normal electrical wastes.
Product Introduction
The PT-PSW-21 is a professional 4K Scaler Switcher that scales HDMI/VGA video signal to an HDBaseT output by selecting output resolution from 720p to 4K via OSD.
The HDBaseT output supports bidirectional PoH and can connect to HDBaseT receiver up to a maximum of 70 meters (230 ft) (HDBaseT receiver sold separately).
With 1 IR In and 1 IR Out and 1 RS232, the IR and RS232 control signals can be transmitted bi-directionally between the PT-PSW-21 and a compatible HDBaseT receiver. It also works with the HDMI and VGA table grommets to switch source and output black screen for display (table grommets sold separately).
The PT-PSW-21 supports advanced built-in EDID management and is HDCP 2.2 compliant. Video and audio sources can be selected via front panel button, table grommets or RS232 commands by 3rd Party control device. Moreover, it features volume buttons to turn up/down the volume level.
Features
- Features 1 HDMI input and 1 VGA input with auxiliary audio input.
- The output resolution can be selected from 720p to 4k x 2k @30Hz 4:4:4 to assure preferred output.
- Transmits 4Kx2K up to 40m (131ft) or 1080p up to 70m (230ft) via HDBaseT port.
- Supports volume control via buttons.
- Supports HDMI/VGA table grommets to control source switching and black screen showing.
- Automatically switch based on video sensing.
- Supports RS232 pass through to communicate control signal between the scaler and the connected HDBaseT matrix or receiver.
- Allows the connected source and display to be controlled via bi-directional IR pass through remotely.
- Supports bidirectional PoH, the HDBaseT receiver can be powered by this scaler switcher, or this scaler switcher can be powered by compatible device via HDBaseT port.
- Supports advanced built-in EDID management.
Package List
- 1x PT-PSW-21 2x1 4K Scaler Switcher
- 2x Mounting Ears with 4 Screws
- 4x Plastic Cushions
- 1x Power Adapter (12VDC, 2A)
- 2x 3-pin Phoenix Connectors
Note: Please contact your distributor immediately if you found any damage or defect in the components.
Panel Description
Front Panel
| No. | Name | Description |
|---|---|---|
| ① | Power LED | Red when powered on. |
| ② | Signal LED | AUTO: Auto switching activity LED. HDMI: HDMI input activity LED. VGA: VGA input activity LED. |
| ③ | Auto Switching Selector | Press this to enter / exit auto switching mode. |
| ④ | Volume Down | Press this to decrease the output volume of scaler switcher and display. |
| ⑤ | Volume Up | Press this to increase the output volume of scaler switcher and display. |
| ⑥ | OUTPUT RES | Press this to enter On Screen Display menu (OSD) to select the output resolution. |
| ⑦ | FIRMWARE | Micro USB port, used for firmware update. |
Rear Panel
| No. | Name | Description |
|---|---|---|
| ① | 1-HDMI IN | HDMI input port, connect with HDMI source device. |
| ② | 2-VGA IN | VGA input port, connect with VGA source device. |
| ③ | AUDIO IN | VGA auxiliary audio input. |
| ④ | IR IN | Connect with IR receiver to control device via IR. |
| ⑤ | IR OUT | Connect with IR emitter to control source via IR. |
| ⑥ | RS232 | Serial port, connect a control device (PC) to control the PT-PSW-21. Control the third-party device from control device based on RS232 pass through. |
| ⑦ | GR1& GR2 | Two 3-pin terminal blocks for connecting with HDMI or VGA table grommet. |
| ⑧ | HDBaseT OUT | Connect with HDBaseT matrix or receivers via Cat5e/6/7 cable. |
| ⑨ | DC 12V | Conenct the including power adaptor. |
System Connection

Usage Precaution
- Verify all components and accessories included before installation.
- System should be installed in a clean environment with proper temperature and humidity (see page16 for limits).
- If the scaler switcher will be permanently mounted to a surface, attach the included mounting ears with the supplied screws.
- All of the power switches, plugs, sockets and power cords should be insulated and safe.
- All devices should be connected before power on.

System Diagram
DC 12VAUDIO IN2-VGA IN1-HDMI IN IR OUT RS232
Tx Rx
GR1 GR2IR IN
OBSM OBSM
HDBaseT OUT
Tx Rx
Blu-Ray
HDMI:
VGA:
IR:
Control:
HDBaseT:
Audio:
Projector
IR Receiver
Blu-Ray Remote
IR Emitter
PT-PSW-21
Laptop
SC-RGH
SC-RGV
Projector Remote IR Receiver
IR Emitter
PT-HDBT-701-RX
RS232 Control
RS232 Control Software
Connect the control device (PC) to the RS232 port of PT-PSW-21. The PT-PSW-21 can be controlled by sending RS232 commands via RS232 control software installed in PC. The RS232 port supports pass through function, in addition, RS232 commands can be transmitted bi-directionally between PT-PSW-21 and HDBaseT receiver, so it is able to control a third party device from local or remote. The baud rate supports 2400, 4800, 9600(default), 19200, 38400, 57600 or 115200.
Here take the software docklight as an example.
- Installation
Please download the latest Software Version from the link below:
https://docklight.de/download/Docklight.zip
Then follow the installation wizard for installation on Windows 7 and 10.
After the installation, Docklight can be run for the first time and should look like the below screen shot:
Registration is not necessary unless you wish to save settings on exit, so unless you wish to register click on "OK" to close the window.

The next pop-up window can also be closed with "Continue". An empty project is enough to send and receive commands easily (The default setting is always “Start with a blank project / blank script “) Click “Continue” to

close this window.
Click “OK” to close this window.
Now you are in the main view, where commands are sent and feedback is received. The next step is to select the correct COM port of the PC. To do this, double-click on "COM1" in the corresponding setup window.
In the following window, select the drop-down menu labeled "Send / Receive on Comm Channel", select the appropriate COM port and then click on "OK" at the bottom right corner.
All other settings can be left at default for most applications, but refer to device RS232 settings to be sure.

Double click on “COM1” to change to the right COM port.
In order to be able to send commands, open communication with the device by clicking on "Play". (1)
Then the keyboard function must be activated, so that commands can be written in the "communication window". (2)
Finally enter the command, for example "50701%". This is then confirmed by pressing "Enter" to send. Any response from the connected device will appear in red. (3)
Select the right COM port.

- Click “Play” to open the communication.
- Enable the keyboard type in function.
- Command sending area.
- Monitoring area, indicates if the command sent works.
- 1
- 2
- 3
RS232 Command
Communication protocol: RS232 Communication Protocol
Baud rate: 9600
Data bit: 8
Stop bit: 1
Parity bit: none
Note: All commands should be end with “<CR><LF>”.
System Configuration
| Command | Function | Feedback |
|---|---|---|
| SFUD | Software upgrading | Software Update |
| GET VER | Check the software version | Version Vx.x.x |
| FRST | Restore factory default | Factor Reset |
| WAKE | Wake up the system | Wake Up |
Signal Switching
| Command | Function | Feedback |
|---|---|---|
| SWIN H1 | Switch to HDMI input | Switch to hdmi |
| SWIN VG | Switch to VGA input | Switch to vga |
| AUTO 01 | Enable auto switching mode | Auto Switching |
| AUTO 00 | Disable auto switching mode | Manual Switching |
Audio Setting
| Command | Function | Feedback |
|---|---|---|
| AUMT S1 | Mute source audio | Audio Mute Source: Enable |
| AUMT S0 | Unmute source audio | Audio Mute Source: Disable |
| VOLS AP | Increase the source volume to xx (xx=0~60) | Source Volume: xx |
| VOLS AN | Decrease the source volume to xx (xx=0~60) | Source Volume: xx |
| VOLS xx | Set the source volume to xx (xx=0~60) | Source Volume: xx |
Output Resolution Selection
| Command | Function | Feedback |
|---|---|---|
| SRES 01 | Change output resolution to 3840x2160 | Resolution: 3840x2160 |
| SRES 02 | Change output resolution to 1920x1080 | Resolution: 1920x1080 |
| SRES 03 | Change output resolution to 1280x720 | Resolution: 1280x720 |
EDID Management
| Command | Function | Feedback |
|---|---|---|
| EDID DF | EDID default | EDID: Initial |
| EDID MN | Get the EDID data from display | EDID: Manage |
| EDID US | When the command applied, system prompts to upload the user-defined EDID file (.bin) from U-disk. | EDID: User |
Baudrate Setting
| Command | Function | Feedback |
|---|---|---|
| BAUD 115200 | Set the RS232 baudrate to 115200 | Set Baudrate 115200 |
| BAUD 57600 | Set the RS232 baudrate to 57600 | Set Baudrate 57600 |
| BAUD 38400 | Set the RS232 baudrate to 38400 | Set Baudrate 38400 |
| BAUD 19200 | Set the RS232 baudrate to 19200 | Set Baudrate 19200 |
| BAUD 9600 | Set the RS232 baudrate to 9600 | Set Baudrate 9600 |
| BAUD 2400 | Set the RS232 baudrate to 2400 | Set Baudrate 2400 |
| BAUD 4800 | Set the RS232 baudrate to 4800 | Set Baudrate 4800 |
Control Far-end Third Party Device
/+b:xxxxxxxxx — Send ASCII command to control far-end third party device from the scaler switcher to receiver based on RS232 pass-through function.
| b | Baud Rate |
|---|---|
| 0 | 2400 |
| 1 | 4800 |
| 2 | 9600 |
| 3 | 19200 |
| 4 | 38400 |
| 5 | 57600 |
| 6 | 115200 |
xxxxxxxxx is for ASCII data (max 48 Byte).
/+2:123456789 — Send the ASCII command “123456789” to control the third party device of which baud rate is 9600.
/-b:xx xx xx xx — Send HEX command to control far-end third party device from the scaler switcher to receiver based on RS232 pass-through function.
| b | Baud Rate |
|---|---|
| 0 | 2400 |
| 1 | 4800 |
| 2 | 9600 |
| 3 | 19200 |
| 4 | 38400 |
| 5 | 57600 |
| 6 | 115200 |
xx xx xx xx is for HEX data (max 48 Byte).
/-2:30 31 32 33 34 — Send the HEX command “30 31 32 33 34” to control the third party device of which baud rate is 9600.
Specification
| Input & Output | |
|---|---|
| Input | (1) HDMI; (1) VGA; (1) AUDIO |
| Input Connector | (1) Type A Female HDMI; (1) female VGA (15-pin); (1) 3.5mm mini jack |
| Output | (1) HDBaseT |
| Output Connector | (1) Female RJ45(with LED indicators) |
| Control | (1) IR IN; (1) IR OUT; (1) RS232; (1) GR1; (1) GR2 |
| Control Connector | (2) 3.5mm mini jacks; (3) 3-pin Phoenix connectors |
| General | |
| Input Resolution | HDMI: Up to 4K@60Hz 4:2:0, supports HDMI1.4, and HDCP2.2 compliant. VGA: Up to 1920x1200@60Hz. |
| Output Resolution | 3840x2160@30Hz,1920x1080@60Hz, 1080x720p@60hz, supports HDMI1.4, and HDCP1.4 compliant. |
| Transmission Distance | 4K≤40m; 1080p≤70m (High-qualified Cat5e/6/7 cable) |
| Bandwidth | 10.2Gbps |
| EDID | In-built EDID management |
| Power Supply | Input:100V~240V AC; Output:12VDC 2A |
| Power Consumption | 8w (max) |
| Operation Temperature | -10 ~ +40℃ (+14℉~ +104℉) |
| Storage Temperature | -15 ~ +55℃ (+5℉~ +131℉) |
| Relative Humidity | 10% ~ 90% |
| Dimension (W*H*D) | 195mm x 23.6mm x 100mm (640ft x 77ft x 328ft) |
| Net Weight (g) | 303g |
Panel Drawing
100 mm (328ft)
FWAUTO VGAHDMI
SOURCE / AUTO-3s OUTPUT RES
195 mm (640ft)
23.6 mm
77ft
Troubleshooting & Maintenance
| Problems | Potential Causes | Solutions |
|---|---|---|
| Output image with white noise. | Bad quality of the connecting cable. | Try another high quality cable. |
| Output image with white noise. | Fail or loose connection. | Make sure the connection is good. |
| No output image when switching. | No signal at the input / output end. | Check with oscilloscope or multimeter if there is any signal at the input/ output end. |
| No output image when switching. | Fail or loose connection. | Make sure the connection is good. |
| No output image when switching. | The switcher is broken. | Send it to authorized dealer for repairing. |
| POWER indicator doesn’t work or no respond to any operation. | Fail connection of power cord. | Make sure the power cord connection is good. |
| Static becomes stronger when connecting the video connectors. | Bad grounding. | Check the grounding and make sure it is connected well. |
| Cannot control the device by control device (e.g. a PC) through RS232 port. | Wrong RS232 communication parameters. | Make sure RS232 communication parameters are correct. |
| Cannot control the device by control device (e.g. a PC) through RS232 port. | Broken RS232 port. | Check with the authorized dealer. |
Note: If your problem persists after following the above troubleshooting steps, seek further help from authorized dealer or our technical support.
After-Sales Service
If there appear some problems when running the product, please check and deal with the problems referring to this user manual. Any transport costs are borne by the users during the warranty.
- Product Limited Warranty: The product will be free from defects in materials and workmanship for two years (The purchase invoice shall prevail). Proof of purchase in the form of a bill of sale or receipted invoice which is evidence that the unit is within the Warranty period must be presented to obtain warranty service.
- What the warranty does not cover (servicing available for a fee):
- Technical Support: For any questions or problems, contact your distributor or reseller and tell them the respective product name and version, the detailed failure situation as well as the formation of the cases.
- Warranty expiration.
- Factory applied serial number has been altered or removed from the product.
- Damage, deterioration or malfunction caused by:
- Normal wear and tear.
- Use of supplies or parts not meeting our specifications.
- No certificate or invoice as the proof of warranty.
- The product model showed on the warranty card does not match with the model of the product for repairing or had been altered.
- Damage caused by force majeure.
- Servicing not authorized by distributor.
- Any other causes which does not relate to a product defect.
- Delivery, installation or labor charges for installation or setup of the product.
Asking for Assistance
Technical Support:
Phone: +49 5971 800299 - 0
Fax: +49 5971 800299 - 99
Technical Support Hours:
8:30 AM to 5:00 PM Monday thru Thursday
8:30 AM to 4:00 PM Friday
Write to:
PureLink GmbH
Von-Liebig-Straße 10
D - 48432 Rheine
www.purelink.de
info@purelink.de
Legal & Compliance
Product identification
Model: PT-PSW-21 – manual version 1.0
Trademarks and disclaimer
Product model and logo are trademarks. All other company and product names mentioned are trademarks of their respective owners. All rights reserved. No part of this publication may be copied or reproduced without prior written permission. We reserve the right to make changes to the device, packaging or manual and accept no liability for misprints.
FCC
Statement This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. It has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a commercial installation.
Disposal of electrical and electronic equipment
WEEE reg. no.: DE 93847290
The crossed-out wheelie bin symbol on the product, packaging or in this manual means that electrical and electronic equipment must not be disposed of with household waste at the end of its life. Hand in old devices free of charge at a public collection point or return them to a distributor obliged to take them back. Remove batteries and lamps that can be removed without destroying the device before handing it in, and delete any personal data stored on the device. Details are regulated by national law. By returning old devices you help protect the environment.
Packaging
Dispose of packaging separately by material (paper/cardboard, plastics) via the local collection systems. Keep packaging material away from children – risk of suffocation. Packaging register LUCID: DE5958616449295.
