Commercial and industrial energy monitoring
Meter data from buildings and sites, kept during connection loss.
NOR Flash · store-and-forward
Energy & telemetry
Smart meter communication gateway
VIOT connects RS-485 meter networks to your Head-End system over 4G LTE Cat 1 or 2G, and keeps collecting when the connection drops.
What VIOT does
One gateway between the meters in the field and the system that reads them.
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Cellular connection
Falls back from 4G to 2G automatically, on a physical SIM or eSIM.
4G LTE Cat 1 / 2G GPRS-EDGE
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Multi-meter management
Reads more than ten smart meters through one or two RS-485 interfaces.
10+ meters per gateway
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Meter protocols
Readout, profile requests and OBIS. DLMS/COSEM is a software library, integrated per meter.
IEC 62056-21 Mode C
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Offline storage
Keeps collecting while offline and replays the records after reconnection, within the available memory.
128 MB NOR Flash
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Secure communication
Secure transport, with AES-256 payload encryption and LZ compression selected per request.
MQTT over TLS 1.3, ECDHE
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Meter scan and discovery
Scans the bus and finds the meters on it; newly added meters join the list on a rescan.
Discovery / rescan · up to 115,200 baud
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Dry contact input
One digital input, read as 1 when the contact is closed and 0 when it is open.
1 dry contact · all models
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Relay output
Latching relay with COM/NC contacts.
240 VAC / 5 A · U11B, U11C
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Cover monitoring
Opening the cover creates a timestamped event and alarm record.
Event log and alarm
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Timekeeping
The internal RTC stamps records, logs and scheduled readouts with the correct time.
RTC ±0.5 s/day · EN 62054-21
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Backup energy
When the supply drops, a rechargeable battery or supercapacitors power the device, depending on the model.
Battery (U11B) or 2 × 10 F supercapacitors
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Local service / remote management
Local service from a mobile application over USB Type-C or RS-485; firmware updates over the cellular network, with a return to the previous version.
USB Type-C / RS-485 · FOTA / OTA
How VIOT works
From the meter bus to your Head-End system.
Service from a laptop or tablet
Connect to VIOT over USB Type-C to configure it, read the meters, read and write its settings and set up the MQTT connection.
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Configuration
Set the APN, physical SIM or eSIM, RS-485 line and baud rate from one screen.
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Meter reading
Instant readings, OBIS codes, profile requests and line scans, listed meter by meter.
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Reading and writing settings
Read the settings on the device, change them and write them back; every command is acknowledged.
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MQTT settings
Enter the broker address, port, client ID, topic and TLS 1.3 settings.
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Schedules, logs and firmware
Edit CRON schedules, read logs and alarms, and update the firmware.
Screens are illustrative and show sample values.
Where VIOT fits
Application areas named in the datasheet.
Multi-meter installations
More than ten meters behind one gateway, on one or two RS-485 lines.
10+ meters · 1 or 2 RS-485
Smart metering and AMI
Advanced metering infrastructure with scheduled readouts from the field.
IEC 62056-21 Mode C · MQTT 5.0
Utility meter data collection
Remote electricity metering over the cellular network.
4G LTE Cat 1 / 2G · eSIM
VIOT models
Four configurations, set by the RS-485 ports, the relay and the backup energy.
| Model | RS-485 | Relay | Backup energy | NOR Flash |
|---|---|---|---|---|
| VIOT-U11B-128 | 1 | 1 | Rechargeable battery | 128 MB |
| VIOT-U11C-128 | 1 | 1 | 2 × 10 F supercapacitors | 128 MB |
| VIOT-U20C-128 | 2 | – | 2 × 10 F supercapacitors | 128 MB |
| VIOT-U10C-128 | 1 | – | 2 × 10 F supercapacitors | 128 MB |
Assembled variants use 128 MB NOR Flash. 32 MB and 64 MB are available by order, with no PCB redesign. All models: 12 V DC input, one dry contact input, USB Type-C, physical SIM or eSIM, external SMA antenna. Relay: latching, COM/NC, 240 VAC / 5 A.
Technical summary
From the VIOT datasheet.
Cellular and network
- Modes
- 4G LTE Cat 1 / 2G GPRS-EDGE
- LTE bands
- B1 / B3 / B5 / B7 / B8 / B20
- GSM bands
- 900 / 1800 MHz
- LTE Cat 1 peak rates
- 10 Mbps down / 5 Mbps up
- IP stack
- TCP/IP, IPv4 and IPv6
Meter interface
- Primary protocol
- IEC 62056-21 Mode C
- Additional library
- DLMS/COSEM, meter-specific integration
- Capacity
- 10+ meters per gateway
- RS-485 ports
- 1 or 2, by model
- Maximum baud rate
- 115,200 baud
Data management
- Scheduling
- CRON, directives, execute jobs
- Head-End link
- MQTT 5.0, TCP/IP
- Reliability
- Application ACK / retry
- Data memory
- 128 MB; 32/64 MB optional
- Log and alarm retention
- 90 days
Security
- Transport
- MQTT over TLS 1.3
- Payload encryption
- AES-256, request-selected
- Key agreement
- ECDHE
- Compression
- LZ, request-selected
- Access control
- IP whitelist, authorized-client checks
Device management
- Remote firmware
- FOTA / OTA over cellular
- Recovery
- Rollback to the previous working version
- Local service
- USB Type-C / RS-485
- Mobile application
- Read, configure and update
- Front panel
- Power, signal ×3, GSM / NET, IP, RS-485
Power and environment
- Supply voltage
- 10.8–13.2 V DC (12 V typ.)
- Supply current, power
- Max. 500 mA, max. 6 W
- Operating temperature
- −30 °C to +70 °C
- Relative humidity
- 0–93 % RH
- Protection
- IP40, IK06
- RTC accuracy
- ±0.5 s/day at nominal temperature
Data retention depends on record sizes, schedules, memory allocation and retry policies.
Why VIOT?
What the datasheet publishes, with the conditions.
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Stays connected
Automatic 4G to 2G fallback and automatic switching between physical SIM and eSIM.
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Keeps collecting
Scheduled collection continues offline and replays after reconnection, within available memory.
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Secure by request
MQTT over TLS 1.3, with encryption and compression modes identified in each request header.
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Maintained remotely
FOTA / OTA over cellular, with recovery to the previously working firmware version.
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Backup energy
A rechargeable battery or 2 × 10 F supercapacitors, depending on the model.
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Documented testing
EN 60068-2-1, -2, -30, -31; EN 62262; IEC 60529; EN IEC 62368-1; IEC 60695-11-10; EN 55032; EN 55035; EN 62054-21.
The listed standards identify the available testing and documentation scope; certificate numbers and laboratory identifiers are in the issued reports. CE and RED conformity declarations are not claimed in the datasheet.
Planning a meter data collection project?
Tell us your meters, their number and your Head-End system. We will help you choose a VIOT configuration.
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