Siemens Presence detector - constant light UP 258E21 | KNX via Matter | BUILD10
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Siemens

Siemens Presence detector - constant light UP 258E21

KNX presence or motion detector for occupancy-based building automation.

Product type
Sensors & inputs
Model / SKU
5WG1 258-2EB21
KNX connection
KNX; consult the exact model documentation and ETS application

Connecting this device to Matter

This product uses KNX. A compatible bridge can expose selected functions to Matter through its IP connection. The KNX device itself does not become a Matter over Thread device.

Functions to map through a bridge

  • Occupancy

Selected native KNX functions can be mapped using a suitable Matter bridge. Additional probes, contacts, couplers, controlled equipment or temperature controllers may be required as described below. Exact device–bridge combinations have not been tested.

Commission the KNX installation in ETS, then configure the bridge with the required group addresses, data types and status feedback. Check the exact bridge firmware and your Matter platform. Native KNX functions, electrical ratings and Matter functions are separate specifications.

Function mapping is not a tested device–bridge pair or individual Matter certification for this KNX model. Protection functions and essential local automation should remain in the KNX installation.

Bridge options by function

These options match the product’s KNX functions to capabilities documented for a bridge. Open the bridge for its requirements and limitations.

1Home Voice & Visu

Function mapping, not a tested device–bridge pair

Occupancy

Proposed from documented KNX and bridge function types. Verify the exact ETS application, required command/status objects, KNX Secure access and receiving-app support. This model–bridge pair has not been physically tested.

View mapping source ↗

1Home Server KNX Pro

Function mapping, not a tested device–bridge pair

Occupancy

Proposed from documented KNX and bridge function types. Verify the exact ETS application, required command/status objects, KNX Secure access and receiving-app support. This model–bridge pair has not been physically tested.

View mapping source ↗

Atios KNX Bridge

Function mapping, not a tested device–bridge pair

Occupancy

Proposed from documented KNX and bridge function types. Verify the exact ETS application, required command/status objects, KNX Secure access and receiving-app support. This model–bridge pair has not been physically tested.

View mapping source ↗

Technical specifications

Presence

Registry model / order number
5WG1 258-2EB21
Dimensions with cover
Ø 88 × 63 mm
Protection rating
IP20
Bus connection
KNX bus terminal
Specifications with sources (4)

Dimensions with cover

Ø 88 × 63 mm

View specification source ↗

Protection rating

IP20

View specification source ↗

Bus connection

KNX bus terminal

View specification source ↗

limitations

This record refers to the older UP 258E21 OPTICONTROL OFFICE generation. The source is a 2014 technical document; do not substitute data or images from UP 258E22.

View specification source ↗

Sources & limitations

Product research reviewed: Nov 5, 2026. This is separate from price, stock and installation-test dates.

Model, firmware & function limitations (4)
  • Product identity and the native function are documented in the official KNX device registry. Matter applicability is an inference from the documented bridge function type, not an exact-SKU compatibility test. Verify the current manufacturer ETS application and required command/status objects before specification.
  • Current production status, availability and price have not been confirmed.
  • Official KNX registry model and function; proposed Matter mapping requires ETS object and bridge validation.
  • This record refers to the older UP 258E21 OPTICONTROL OFFICE generation. The source is a 2014 technical document; do not substitute data or images from UP 258E22.
Manufacturer documentation & sources (2)
  • KNX Association — Presence detector - constant light UP 258E21 ↗Reviewed Nov 5, 2026
  • Manufacturer technical product documentation ↗Reviewed Nov 5, 2026
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