HDMI over Cat5 Video Extender with Audio - RS232 and IR Control

Extend an HDMI® source with audio, RS232 and IR over Cat5 cabling

Product ID: ST121UTPHDEU

  • 80m (260ft) maximum cat5 (or better) cable distance
  • Extends HDMI or DVI video with control signal over a single CAT5/5e/6/6a/7 UTP/STP cable
  • Supports bi-directional RS-232 and IR communication
View More
  • Supports resolutions up to 1080p / 60Hz / 48 bit
  • RS-232 interface supports up to 115200bps full-duplex data rate
  • No software or drivers required
  • Audio transmission supports Dolby TrueHD, DTS-HD MA
  • High-Speed HDMI and HDCP compliant
600,92 € EUR exc VAT
751,15 € EUR inc VAT
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Where To Buy


The ST121UTPHDEU HDMI Audio Video Extender over Cat5 with RS232 and IR extends an HDMI (or DVI) source signal up to 80 meters (260 feet) using a standard Cat5 or better UTP/STP cable, giving you the freedom to optimize the placement of your display without sacrificing image quality. Compliance with High-Speed HDMI as well as HDCP ensures that even the latest devices will be able to pass a signal with support for full 1080p resolutions and the accompanying digital audio.

This HDMI A/V extender also features bi-directional RS232 serial and Infrared (IR) interfaces allowing you to communicate with and control your media source from either end of the connection.

Comprised of a transmitter and receiver unit this HDMI, RS232 and IR extender kit is a complete, cost-effective solution for digital signage, trade-show demo stations or video conferencing.

Backed by a 2-year warranty and free lifetime technical support.

The Advantage

  • Cat5 extension design allows you to make use of existing Cat 5 or better wiring infrastructure
  • Integrated bi-directional RS232 and IR interfaces allow you to communicate with, monitor and control your source device from either end of the connection
  • Support for full 1080p resolution with accompanying digital audio lets you display your content the way its meant to be seen and heard


Ideal for digital signage applications in financial, educational, medical and business sectors

Perfect for video conferencing solutions in boardrooms and office settings

Place the display in a convenient viewing area, while the system equipment is placed elsewhere in a clean and secure environment

Optimize placement of your demo stations at trade-shows and in auditoriums

Sending Video images and serial data to a projector and controlling it from your desk

Extend your display across harsh environment industrial sites

Technical Specifications

Warranty Information
Warranty 2 Years
Audio Yes
Cabling Cat 5 UTP or better
Daisy-Chain No
Industry Standards High Speed HDMI and HDCP compliant
Ports 1
Audio Specifications Supports Dolby TrueHD, DTS-HD MA
IR Interface Bi-directional
38Khz / ±10° / 5M
Max Distance 80 m / 260 ft
Maximum Data Transfer Rate HDMI - 3.4Gbps
RS232 - 115200bps baud
Maximum Digital Resolutions 1080p @ 60Hz, 48-bit
Wide Screen Supported Yes
Local Unit Connectors 1 - DB-9 (9 pin, D-Sub) Female
1 - HDMI (19 pin) Female
1 - RJ-45 Female
Remote Unit Connectors 1 - DB-9 (9 pin, D-Sub) Male
1 - HDMI (19 pin) Female
1 - RJ-45 Female
OS Compatibility OS Independent
LED Indicators 1 - IR Receive (Blue)
1 - IR Transmit (Red)
1 - Power (Solid Green when power present)
1 - RJ45 Link (Solid Green when link present)
Input Voltage 230 AC
Output Current 2A
Output Voltage 5 DC
Power Consumption (In Watts) 1200mA (max)
Power Source 2 AC Adapters Included
Humidity 0-95%
Operating Temperature 0°C to 55°C (32°F to 131°F)
Storage Temperature -20°C to 85°C (-4°F to 185°F)
Physical Characteristics
Color Black
Enclosure Type Steel
Product Height 30 mm [1.2 in]
Product Length 130 mm [5.1 in]
Product Weight 1000 g [35.3 oz]
Product Width 88 mm [3.5 in]
Packaging Information
Shipping (Package) Weight 1.1 kg [2.4 lb]
What's in the Box
Included in Package 1 - Transmitter Unit
1 - Receiver Unit
2 - IR Emitter Cable
2 - IR Receiver Cable
2 - Power Adapter
1 - User Manual
Supports any operating system.
No additional drivers or software required.


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