NB-IoT Communication•LTE NB1/2, Cat-M1
•LTE- FDD: B1/3/4/5/8/12/13/14/18/19/20/25/26/27 /28/66/71(Global Band) /85
•GSM850, EGSM900, DCS1800, PCS1900
•Build-In Spring-Type ANT. / SMA for external ANT.
•LTE Signal Indication: RSSI, SINR, RSRP, RSRQ
Modbus RS485 Connection, Relay DO•One 2-wire RS485-A, RS485-B
•Modbus Function Code: 01,02,03,04,05,06
•Register Data Type: Unsigned Int/Int, Unsigned Short/Short, Float, ASCII for function Code 03,04
•RTU Serial Baud Rate: 1200~9600bps
•One Dry Relay Control for Ext. Device Power-Up
•Spring Type, Screw-less cable connector
•Modbus Polling with DMA access, prevent RTU Device Polling Time-Out
Rugged and Multiple Operation Modes for Industrial Application•Standard, Sleeping power saving, Alert Quick reporting with threshold setting
•Outdoor IP68 Weatherproof Enclosure
•-40 ~ 70°C / 90%H Environment Operating Temperature
•Compliance IEC 61000-6-2/-6-4 Heavy Industrial EMC
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Windows© Configuration Tools•Configuration through USB interface
•Menu type, Non-Install Utility Tool
•Multifunction Set/Test: Base Station, Cloud Server, RTU
•Modbus Device, Register Setting- 20 Devices, 140 Registers (Max), 70 Registers (Floating Data Format), Byte-Swapping
•USB, Serial Com port simulation
•100 event logs- System Power on (Sys_on), Base-Station Fail (BS_F), , Server Fail (S_F)
•Text Configure file Download / Upload
•Far-End Device Alive Check – ICMP Ping at GSM Mode
Screw-less wiring, Wide Range Power
Network and Protocols
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SCB111-485-NB-DC
The SCB111-485-NB-DC gateway enables communication between RS485 RTU devices and cloud servers via CAT M1 or NB-IoT networks. It transmits data securely in JSON format using the MQTT protocol with AES128-bit encryption. Supporting three modes—standard, power-saving sleep, and alert—it adapts to various IoT needs. Configurable via MicroUSB and Windows utility, the gateway connects up to 20 Modbus slave devices, polls 30 Modbus registers, and sends data to the cloud in four MQTT messages. Compact and IP68-rated, it operates in harsh outdoor conditions (-40 to 70°C). Both internal and external antennas are supported for flexible deployment, and remote firmware updates (ThingsMaster OTA/FOTA) simplify large-scale operations.
Ready Total Solution for IoT
Friendly User Configuration Utility
Various Function TABs•Modbus RTU Serial, Cellular
•MQTT, TCP Transparent
•Security-SSL
•RTU Device / Register/ Alert Setting
•System operating mode
•System Maintenance – System Log
Configuration Upload/Download
Multiple Operating Mode- Standard, Alert, Sleeping
Standard Mode•Keep Connection always
•System publish interval time follows MQTT setting
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Sleeping Mode
•System wake-up and Trigger-On Relay to enable external circuit.
•RTU register polling will keep a standby timer for RTU ready.
•System publish register value in a publish interval time.
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Alert Mode
•System working in sleeping
• mode, wake up polling RTU data.
•Check the RTU value exceeds the threshold value. Once the register value exceeds the condition value, then the system changes to standard mode and performs MQTT publish without sleeping
Converts RAW data and Publish, Judgement
System Event log, Configuration File backup & Restore
| Technology | |
| Standard | 3GPP Release 14 NB-IoT
Modbus RTU, TCP, MQTT/ MQTTs, HTTP/ HTTPs |
| Cellular Properties | |
| Data Rate |
Cat. M1: 529Kbps (DL)/1119Kbps(UL) Cat. NB2: 136Kbps(DL)/ 150Kbps(UL) |
| Band Information |
Global version Cat.M1 (LTE-FDD):B1/2/3/4/5/8/12/13/14/18/19/20/26/27/28/66/---/ 85 Cat.NB2 (LTE-FDD):B1/2/3/4/5/8/12/13/--- /18/19/20/26/---/28/66/71/85 GSM850/ EGSM900/ DCS1800/ PCS1900 |
| Radio RX Sensitivity |
Cat.M1: -103 dBm (Min.) Cat.NB2: -113dBm (Min.) |
| Radio TX Power |
Cat.M1/ NB2: 20 (+/- 2.7) dBm GSM/EGSM:33 (+/- 2) dBm DCS/PCS: 30 (+/- 2) dBm |
| LTE Indication (Utility) |
Connected Band, Operating Mode: M1/NB RSRQ: Signal Receive Quality measured, Unit dB RSRP: Signal Received Power for Cat-M1, NB1/NB2, Unit dBm RSSI: Received Signal Strength Indicator, Unit dBm SINR: Signal to Interference plus Noise Ratio, -20~30 dB |
| Management | |
| System Management |
1 x Micro USB 2.0 internal port for System Utility Configuration Event Log: 100 Entries, supports download file, Erase Data Log Configuration Upload / Download |
| Network | IPv4/IPv6 |
| Software Utility |
SCB111-485 utility, executed at Windows system without Pre-installation |
| Event Log |
100 Event Entries, Power On, Base_Station_Fail, MQTT_Server_Fail |
| Ping Alive Check |
Support Ping function for the Far-End device alive check in GSM mode. |
| Configuration Backup |
Configuration Download/Upload via Utility in Text file. Parameter Includes: RTU Port, IoT Parameters, MQTT Parameters, RTU Tag/ Register |
| Operation Modes |
•Standard Mode: LTE Communication keep alive
•Sleeping Mode: provides energy saving feature and supports Wake up Interval timer, Standby Timer to enable RTU polling, and Publish Interval Timer.
•Alert Mode: working in sleeping /power saving mode, and once the register value is over the threshold value then changes to Standard mode with more frequent publish.
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| Alert |
Provides Hi/Low Threshold with simultaneous operation of multiple register values and performs logical operations using AND or OR. |
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MQTT Modbus |
Connects RTU devices handle up to 20 and handle 30 registers with a process capability of 60 bytes. Modbus Register Data Format: Short/ Unsigned Short/ Integer /Unsigned Integer /Float / ASCII for Modbus function code 03, 04 and Byte-Swap function - Big-Endian, Little-Endian MQTT Publish: Relay State Modbus Function Code 01: Read Coil-Read Output Control bit Modbus Function Code 02: Read Discreet-Read Input bit, Read Input bit Modbus Function Code 03: Read Holding Register – Read Output word Modbus Function Code 04: Read Input Registers – Read Input Word MQTT Subscribe: after system published, the system change to subscribe mode until next publish. After subscribing control, the system will publish ECHO message to MQTT server. The available functions as following: •Relay Control On/Off
•Modbus Function Code 05: Write Single Coils – Write one bit output
•Modbus Function Code 06: Write single Register – Write one word output
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RS485/ TCP Transparent |
Bi-Directional data transparent between TCP Server and Modbus RTU Device During the TCP Transparent Mode, the LTE keeps connection without suspend |
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FOTA (Firmware OTA) COTA (Configure OTA) |
The firmware upgrade over the air (FOTA) function is only available at MQTT operating mode by the HTTP get command. The device subscribes the FOTA command from the MQTT Cloud server. The Modbus RTU configuration support upgrade through the HTTP get command (COTA) Support 2 Flash-ROM segments to ensure the system doesn’t crash by power interruption during the FOTA. |
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SSL |
MQTTs/HTTPs/TCP supports Validate Certificate, Mutual Authentication |
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LED Indication |
LTE TX/RX (G) : second blinking (no register), blinking slow (registered), fast flashing (LTE communication) LTE State (G): On ( LTE module ready), Off (LTE module off) (For power saving will be removed) Power: On (Power ready) (For Power Saving will be removed) |
| Interface (Internal) | |
| SIM Socket | 1x Nano-SIM Socket |
| USB | 1x Micro USB for configuration & firmware upgrade, switch by internal jumper |
| Antenna |
SCB111-485: 1x 3dBi internal Antenna SCB111-485-SMA: Waterproof SMA Connector |
| Relay Output |
On-Board Screw-less, Spring Type Terminal Connector (20~24AWG) – 2 Conductors Internal Dry Relay Output (DO), Rating: 30VDC/1A |
| RS485 |
On-Board Screw-less, Spring Type Terminal Connector (20~24AWG) – 2 Conductors 2-Wire RS485A, RS485B with isolation Baud Rate:1200, 2400,4800, 9600bps DMA Polling Time: 120 Seconds /Cycle (Maximum) with 140 Registers Routing Polling (Modbus RTU time-out 200ms) |
| Power Input |
On-Board Screw-less, Spring Type Terminal Connector (20~24AWG) – 2 Conductors Earth Ground (E.G.) - 1 Conductor Power Input: DC24V (Rating 9~30V) Power Consumption: 3W / DC 24V ( Maximum), 260uA@ Power Saving mode
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| PG9 Connector | 4-8mm diameter IP68 |
| Mechanical | |
| Installation |
Wall Mounting with 2 Mounting holes |
| Dimension | 90*50*42 mm (without mounting holes) |
| Ingress Protection | IP 68 Plastic Enclosure |
| Weight |
100g |
| Environmental | |
| Operating Temperature |
-40°C~70°C, 0% ~ 90%, Non-Condensing |
| Storage Temperature |
-40°C~80°C, 0% ~ 90%, Non-Condensing |
| Reliability & Warranty | |
| MTBF | > 200,000 Hours |
| Warranty | 3 Year |
| Model | Description |
| SCB111-485-DC |
Industrial Smart Modbus RS485 Gateway, NBIoT, LTE Cat. M1, 1 Nano-SIM, Global Band, DO ,9~30Vdc, Internal Spring type Antenna |
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SCB111-485-SMA |
Industrial Smart Modbus RS485 Gateway, NBIoT, LTE Cat. M1, 1 Nano-SIM, Global Band, DO ,9~30Vdc, SMA Connector |