Comelit UT2020 Ultra Simplebus2 Audio/Video Module
The Comelit UT2020 is a wall-mounted audio/video module engineered to expand Simplebus2 entrance panel systems with live visitor identification and two-way conversation capability. This accessory integrates directly into Comelit Ultra entrance panels (flush 10mm or surface 35mm mount configurations) without requiring parent system reconfiguration or firmware updates. It addresses the retrofit scenario where existing Simplebus2 installations need remote visual verification at the entry point — adding camera and microphone capability to a doorway that previously relied on audio-only communication.
Key Features
- Fixed Wide-Angle Camera: 120° horizontal, 90° vertical field of view. Full-frame visitor identification at standard residential/commercial door distances; no pan/tilt or digital zoom.
- Two-Way Audio: Omnidirectional digital microphone with dual loudspeaker array. Captures visitor speech without precise positioning; delivers high-fidelity audio from door station back to interior unit.
- Compact Form Factor: 3.94" × 3.54" × 1.38" white housing. Flush (10mm) or surface (35mm) wall mounting — integrates aesthetically into standard residential/commercial entry trim.
- Twilight Sensor: Integrated photodiode automatically disables nameplate backlight during daylight hours, reducing LED power draw and extending backlight service life on battery-backed or 24/7 powered systems.
- Direct Simplebus2 Integration: No external power supply reconfiguration — works with existing Comelit 1210 or 1210A supply modules. Plug-and-play into Ultra entrance panel.
- Weatherproof Housing: White UV-stabilized polymer enclosure; suitable for covered porches and semi-exposed entries (not full outdoor/marine environments).
- 2-Year Manufacturer Warranty: Covers defects in materials and workmanship under normal residential/light commercial installation conditions.
Optical and Audio Performance
The UT2020 employs a fixed wide-angle lens (no motorized focus or zoom) optimized for entrance identification at 0.5–2 meter distances. The 120° × 90° field of view captures full-body visitor silhouettes and facial detail sufficient for name intercom verification but not forensic identification — do not oversell this module as a perimeter or long-range surveillance device. The omnidirectional digital microphone topology eliminates visitor mic-positioning friction common to single-point audio systems. Dual loudspeaker implementation provides balanced audio projection into the entry environment without feedback typical of single-speaker designs.
The twilight sensor is a passive photodiode; it does not measure lux quantitatively but rather toggles backlight on/off based on ambient brightness thresholds. In heavily shaded porches or interior vestibules with poor natural light, manual backlight control from the interior unit may be necessary to override sensor behavior.
Simplebus2 System Architecture
The UT2020 is electrically and logically part of the Simplebus2 architecture — a proprietary four-wire serial bus operating at 9600 baud, bridging entrance panels, interior handsets, and auxiliary modules. It does not support ONVIF, RTSP, or IP-based streaming; video and audio are confined to the Simplebus2 network and accessible only via registered Comelit handsets or authorized control panels. This design has security implications: no remote access via smartphone or cloud without a third-party Comelit IP gateway (sold separately). Verify your Comelit installation plan includes IP gateway infrastructure if remote visitor verification is a project requirement.
Installation and Deployment Constraints
The module requires a Comelit Ultra entrance panel (art. 1129, 1130, or later revisions) and a compatible power supply (Comelit 1210 or 1210A). Legacy Simplebus1 systems, non-Comelit intercom architectures, and non-Ultra entrance panels are not compatible. Installation is straightforward — disconnect the entrance panel, insert the UT2020 module into the dedicated video/audio slot, and reconnect power and Simplebus2 bus wires. No firmware update or dip-switch configuration required. Mounting requires standard dry-wall anchors (flush mount) or surface conduit clips (surface mount); a 35mm surface-mount box is recommended for retrofit applications where recessing the panel is impractical.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed the Comelit UT2020 in retrofit scenarios where a property manager wanted to upgrade audio-only Simplebus2 intercom to video-enabled without replacing the entire entrance panel infrastructure. The UT2020 solves that problem cleanly — it's a module swap with zero impact on the parent system topology or wiring. What differentiates it from generic CCTV doorbell cams is the native Simplebus2 integration: no separate IP network, no additional PoE switch, no cloud subscription or smartphone app architecture required. If your deployment is confined to a wired four-family building or small commercial lobby where audio/video verification is needed solely on interior handsets, this module is cost-effective and requires minimal technical lift to deploy. The trade-off is obvious: no mobile app access, no remote cloud archival, and no integration with third-party VMS platforms like Milestone or Genetec. The wide-angle fixed lens is sufficient for residential entry doors but will disappoint installers expecting zoom or PTZ capability. We've seen sites where the lack of lens motorization forced substitution of a full IP doorbell camera instead — evaluate your FOV and zoom requirements carefully before committing to UT2020.
Technical Highlights:
- Omnidirectional Microphone: Eliminates visitor mic-positioning friction and reduces audio quality complaints on retrofits. In noisy entry vestibules (lobbies with HVAC noise, high foot traffic), the digital signal processing maintains speech clarity better than mechanical passive mics, but is not a substitute for acoustic treatment.
- Dual Loudspeaker Array: Provides balanced audio projection and reduces feedback/howl compared to single-speaker entrance panels. On large commercial vestibules (>200 sq ft), the 85dB max SPL may be insufficient — verify decibel requirements against the datasheet before site assignment.
- Twilight Sensor: Reduces nameplate backlight LED power draw during daylight — measurable battery life extension on systems running on 24/7 backup power or solar. The threshold is fixed; there's no user adjustment via handset menu, so installation in heavily shaded sites may require manual backlight control.
- Fixed Optical Design: No motorized focus, no zoom, no digital pan/crop. 120° × 90° FOV is appropriate for 0.5–2m entry identification but inadequate for long-range perimeter or common-area surveillance. Visitors >3m from the lens will not provide sufficient facial detail for evidentiary purposes.
- Simplebus2-Native: Four-wire serial bus; no IP gateway or separate power supply beyond the parent Comelit 1210/1210A module. Deployment is wiring-simple but functionally closed — no ONVIF, no RTSP, no open-protocol streaming to third-party NVRs.
Deployment Considerations:
- Confirm entrance panel model (art. 1129, 1130, or later) and power supply SKU (1210 or 1210A) before ordering — the UT2020 is not backward-compatible with Simplebus1 or non-Ultra panel revisions, and mismatches will result in installation delays.
- The module does not support IP-based remote access without a separate Comelit IP gateway product (e.g., art. 4701 or later IP controller). If the project brief requires smartphone push notifications or cloud clip storage, plan for additional gateway hardware and licensing.
- Mount the module in covered entry environments (porches, vestibules, lobbies) — the white plastic housing is UV-stable but not rated for full sun exposure, rain, or salt spray. Verify NEMA/IP rating alignment with your site's environmental conditions.
- The wide-angle lens cannot provide evidentiary-quality zoom. If visitor identification beyond the immediate entry threshold is required, request a site survey to confirm focal distance and consider IP doorbell cameras with higher resolution or zoom capability as an alternative.
- Twilight sensor is passive and non-adjustable; in heavily shaded interiors, the backlight may remain off during low-light conditions. Test before final acceptance, and budget for manual override training if end-user control is needed.
The UT2020 is the right choice for property managers operating established Simplebus2 multiunit residences or small commercial sites who want to add visual entry verification without capital-intensive panel replacement or IP network buildout. For projects requiring mobile app access, cloud archival, or interoperability with third-party VMS platforms, a standalone IP doorbell camera or a Comelit system with integrated IP gateway will better serve the brief. Learn more in the Comelit catalog.
