How to change key date on Rossweiner heatplus opto

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Direct answer to the question • On a Rossweiner Heatplus Opto heat-cost allocator the “key date” Stichtag is a protected calibrationbilling parameter. • It cannot be changed from the front push-button or by the tenantowner. • It can only be re-programmed by an authorised metering technician using an infrared opto-head and RossweinerQUNDIS “Q Suite” or equivalent service software, after unsealing the device in service mode. • Therefore the correct procedure is to contact the property manager or the metering service company and request a technician visit; any attempt to change the date yourself is regarded as tampering and will invalidate the meter for billing. --- Detailed problem analysis 1. Purpose of the key date • Heat-cost allocators integrate consumption continuously. • Once per year on the key date the current register is copied to “previous period”, then reset to zero – guaranteeing that all devices in a building cover exactly the same billing interval. • Because this value is the legal basis for invoicing in the EU under MID 201432EU and in Germany under Heizkostenverordnung, metrological integrity is mandatory. 2. Hardware firmware restrictions • Heatplus Opto uses a sealed microcontroller with two memories: running register volatile and annual registers NV-EEPROM. • The optical port IrDA 38 kHz, 2400 Bd is the only write channel. • The front button cycles through a fixed, read-only display loop current value → last period → segment test → key date, e.g. “31.12” but never enters a parameter menu. 3. Service-level change workflow a. Technician fits an IrDA opto-head Rossweiner QUNDIS EWE512 or compatible onto the window. b. Launches Q Suite or OEM service program on a laptophand-held terminal. c. Authenticates with “Installer” or “Service” password higher level than “Reader”. d. Reads current parameter set → edits “Stichtag” format DD-MM → writes back. e. Software forces a checksum and logs the intervention date, technician ID. f. The device’s tamper flag is updated; a new metrological seal number is stored. g. Procedure must be repeated on all allocators in the same billing group. 4. Why user access is blocked • Prevents deliberate or accidental data manipulation. • Ensures all flats in a building are billed on the same 365 d window. • Required by MID, DIN EN 834835 and national law; broken seals invalidate evidence in billing disputes. --- Current information and trends • Rossweiner devices are now produced under the QUNDIS umbrella; service software versions ≥ Q Suite 5.0 support Heatplus Opto parameterisation. • Recent models are read remotely via OMS-wireless; key date can be shifted from the backend but still only by accounts with service credentials. • Sector trend: remote over-the-air configuration with cryptographic signing OMS Generation 5, LoRaWAN, but user self-programming remains legally excluded. --- Supporting explanations and details • Reading the programmed key date yourself 1. Press button once → current reading. 2. Press again → previous period reading often shown with “M”. 3. Continue until display shows a date e.g. “30.09” – that is the key date. • Typical opto-head specification – 9600 Bd half-duplex; galvanically isolated; USB-powered; LED current 20 mA. – ISOIEC 11544 modulation, wavelength 870 nm. • Example of parameter record in Q Suite Stichtag = “31.12”; Stichtag Alt = “30.09”; Radio Mode = OMS Mode5; AES-Key = xxxxxxxx. --- Ethical and legal aspects • Under German HeizkostenV §53 altering a sealed measuring instrument without authorisation constitutes an administrative offence. Similar provisions exist across the EU under MID. • A landlord must guarantee correct metering; tenants have the right to demand correction, but not to intervene themselves. --- Practical guidelines 1. Document any suspected wrong key date photo of display. 2. Notify landlordproperty manager in writing. 3. They open a ticket with the contracted metering service ista, Techem, Brunata-Metrona, QUNDIS partner, etc.. 4. Technician visits, re-programmes all devices, issues protocol. 5. Verify new date via display after visit. Potential challenges & mitigation • Building access: arrange apartment availability. • Out-of-sync devices: insist on whole-building re-parameterisation. • Cost allocation: usually borne by landlord as part of operating costs. --- Possible disclaimers or additional notes • Very early Heatplus non-Opto models from the 1990s lack optical programming; they must be factory-re-flashed – replacement is cheaper. • Some wireless variants support OTA shift only once per calendar year; beyond that a site visit is unavoidable. • If your device shows error codes Err 1, Err 2 the issue is likely sensor failure, not key date. --- Suggestions for further research • Review RossweinerQUNDIS “Service Manual Heatplus Opto V4.1” – available to certified partners. • Study DIN EN 834835 for technical requirements of heat allocators. • Follow developments in OMS Gen 5 remote meter configuration and cybersecurity AES-128 vs. AES-256 migration. --- Brief summary The key date in a Rossweiner Heatplus Opto is a legally relevant, factory-sealed setting. For security and compliance reasons it is not user-adjustable. Changing it requires an authorised technician equipped with an infrared opto-head and Q Suite service software, who must re-programme every allocator in the building and document the action. If the displayed key date is incorrect, the proper route is to inform your property manager and arrange a service visit; any attempt at self-programming constitutes tampering and can invalidate billing.

Rossweiner Heatplus Opto key date change procedure – technician access, QUNDIS Q Suite, legal aspects

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