Gateway V4 + Level Probe
This product is a ready-to-use bundle based on the Gateway V4 + Modbus (LOB-GW4-MODBUS-LS), shipped pre-configured together with a Modbus pressure / level probe. It runs the same firmware as the Modbus gateway, but differs in:
- a smaller (compact) housing, and
- only the 19 Ah battery option.
See the component list below for housing, battery and probe details.
Description
Gateway for remote monitoring of pressure and temperature values via NB-IoT, LTE-M or LoRaWAN. Suitable for indoor and weather-protected outdoor installations. Based on the Gateway V4 platform, this device combines all standard Gateway V4 features with integrated Modbus data acquisition, enabling easy connection of Modbus pressure sensors such as the KELLER Series 26X. This product variant is functionally equivalent to the Gateway V4 + Modbus, as both use the same firmware and offer the same core capabilities.
Features
All Gateway V4 Series platform features plus:
- Modbus ASCII / RTU reading via RS-485
Included Level Probe (KELLER Series 26X)
| Property | Value |
|---|---|
| Manufacturer | KELLER Druckmesstechnik AG |
| Measurement range | 0…15 mH₂O (≈ 1.5 bar hydrostatic pressure) |
| Accuracy | ± 0.25 % FSO at 25 °C · ± 0.1 % FSO on request |
| Long-term stability | ± 0.3 % FSO per year |
| Measurement principle | Relative pressure |
| Temperature sensor | Integrated in probe |
| Cable | 15 m, incl. M12 cable gland · other lengths on request |
This product is manufactured by Lobaro using the components listed below. Detailed information about the firmware and other components can be found in their respective descriptions.
Please use the links provided to access comprehensive product details.
| Component | Manual / Description | Additional note |
|---|---|---|
| Firmware | app-nrf91-origin | See here for available firmware updates |
| Housing | Compact housing | 114.30 mm (w) × 59.30 mm (l) × 26.80 mm (h) |
| Power Supply | Battery | (Li-SOCl2) 3.6 V, 19 Ah |
| External power supply (12 V or 230 V) | Please contact | |
| Optional Accessories | External Antenna (SMA) instead of | Please contact |
IP68 encapsulation with transparent, | ||
| LoCube Backplate Wall Mounting Kit | ||
| Pole Mounting Kit | ||
| Sensor | KELLER Series 26X | Lobaro article: #3000701 |
Product Identification
- Name: Wireless M-Bus Gateway V4 Level Sense
- Type: LOB-GW4-MODBUS-LS
This product is a bundle — both components have separate order codes:
| Component | Order code |
|---|---|
| Gateway V4 + Modbus (pre-configured) | 1200754-002 |
| KELLER PR26X Level Probe (0–16 m) | 3000701 |
LED Signal Patterns
The device uses the standard V4 LED signal patterns. See LED Signal Patterns for the full reference.
Battery Lifetime Estimator
Please contact our sales team.
Configuration
The device is shipped with default configuration parameters. Local changes can be made via the config port using the USB Config Adapter and the Lobaro Config Tool.
For step-by-step instructions, see the Configuration Methods guides:
- 🔌 Local Config via USB — connect directly to the device
- 📡 Remote Config via CoAP — over NB-IoT / LTE-M via Lobaro Platform
- 📻 Remote Config via LoRaWAN — via LoRaWAN downlink
- 🔗 Remote Config via MQTT — for 3rd party MQTT backends
Custom factory configuration is available on request — devices can be pre-configured at production for your specific deployment. Contact sales@lobaro.de when ordering.
Firmware Updates
The latest firmware can be found here:
- Download latest firmware
-
For further information on how to update the device, refer to: Firmware Update.
A remote firmware update over LoRaWAN is currently not possible.
Default Values are the firmware defaults. Depending on the application the device will be delivered with different settings, see section below.
Configuration Parameters
This product runs the app-nrf91-origin firmware. To avoid duplication, the parameters are documented centrally with the firmware component and are not repeated here:
- Common firmware parameters — general, wireless M-Bus, LTE and LoRaWAN settings shared by all V4 gateways
- Modbus Add-On parameters —
modbusCmdConf,addonAccumulateand other add-on specific settings
Application specific non-default values
The following parameters are configured in production to align with the application settings.
KELLER Series 26X (currently available)
| Name | Description | Value |
|---|---|---|
modbusCmdConf | Reads pressure (reg 2+3), temperature (reg 8+9), battery voltage and device temperature | R,9600,8N1:010300020002,010300080002,FA0400050001,FA0400040001 |
cmodeDurSec | Disable C1/T1 mode collection | 0 |
listenCron | Read interval (example: every hour) | 0 0 * * * * |
PowerOnDelay | Recommended for battery variants | 1500 |
KELLER Series 46X (discontinued)
KELLER Series 46X — discontinued, for reference only
| Name | Description | Value |
|---|---|---|
modbusCmdConf | Reads pressure (reg 2+3), temperature (reg 6+7), battery voltage and device temperature | R,9600,8N1:010300020002,010300060002,FA0400050001,FA0400040001 |
cmodeDurSec | Disable C1/T1 mode collection | 0 |
listenCron | Read interval (example: every hour) | 0 0 * * * * |
PowerOnDelay | Recommended for battery variants | 1500 |
Lobaro Pressure and Temperature Sensor (discontinued)
Lobaro Pressure and Temperature Sensor — discontinued, for reference only
| Name | Description | Value |
|---|---|---|
modbusCmdConf | Reads pressure (reg 16+17), temperature (reg 26+27), battery voltage and device temperature | R,9600,8N1:010300160002,010300260002,FA0400050001,FA0400040001 |
cmodeDurSec | Disable C1/T1 mode collection | 0 |
listenCron | Read interval (example: every hour) | 0 0 * * * * |
PowerOnDelay | Recommended for battery variants | 3000 |
Modbus Config Generator
The Modbus request syntax for modbusCmdConf complies with the Modbus specification, except that the 16-bit CRC at the end is omitted.
LoRaWAN Uplink Formats
- LoRaWAN Protocol — Status Packet (Port 1) and wM-Bus uplink formats
- Modbus Add-on LoRaWAN Uplinks
- 1-Wire / Temperature Add-on LoRaWAN Uplinks
Cellular Uplink (LTE)
Cellular uplink uses CoAP (with the Lobaro IoT Platform) or MQTT for third-party integration. The protocol details are documented centrally with the firmware:
The CoAP implementation details are not publicly disclosed and are intended for use exclusively with the Lobaro IoT Platform. If MQTT is not an option, please contact Lobaro directly.
Declaration of Conformity
 | Download CE declaration of conformity |