Table of Contents:

• 1. Introduction
  • 1.1 What is SN50v3-NB NB-IoT Sensor Node
  • 1.2 ​Features
  • 1.3 Specification
  • 1.4 Applications
  • 1.5 Sleep mode and working mode
  • 1.6 Button & LEDs
  • 1.7 BLE connection
  • 1.8 Pin Definitions , Switch & SIM Direction
    • 1.8.1 Jumper JP2
    • 1.8.2 BOOT MODE / SW1
    • 1.8.3 Reset Button
    • 1.8.4 SIM Card Direction
• 2. Use SN50v3-NB to communicate with IoT Server
  • 2.1 Send data to IoT server via NB-IoT network
  • 2.2  Working Mode & Uplink Payload
    • 2.2.1  CFGMOD=1 (Default Mode)
    • 2.2.2  CFGMOD=2 (Distance Mode)
      • Connection of LIDAR-Lite V3HP:
    • 2.2.3  CFGMOD=3 (3 ADC + I2C)
    • 2.2.4  CFGMOD=4 (3 x DS18B20)
    • 2.2.5  CFGMOD=5 (Weight Measurement by HX711)
    • 2.2.6  CFGMOD=6 (Counting mode)
    • 2.2.7  CFGMOD=7 (3xADC + 3xDS18B20 mode)
    • 2.2.8  CFGMOD=8 (Three interrupts or three counting modes)
      • 2.2.8.a Three interrupts modes:
      • 2.2.8.b Three counting modes:
    • 2.2.9  CFGMOD=9 (Count+SHT31 mode)
    • 2.2.10  CFGMOD=10 (TMP117 Temperature Sensor Mode)
  • 2.3 ​Payload Types
    • 2.3.1 General Json Format(Type=5)
    • 2.3.2 HEX format Payload(Type=0)
    • 2.3.3 ThingsBoard Payload(Type=3)
    • 2.3.4 ThingSpeak Payload(Type=1)
  • 2.4 Test Uplink and Change Update Interval
  • 2.5 Multi-Samplings and One uplink
  • 2.6 Trggier an uplink by external interrupt
  • 2.7 +5V Output
  • 2.8 Analogue Digital Converter (ADC)
  • 2.9 Clock logging (Since firmware version v1.2.1)
    • Unix TimeStamp
    • Poll sensor value
    • Datalog Uplink payload
  • 2.10 Example Query saved historical records
  • 2.11 Uplink log query
  • 2.12 Scheduled domain name resolution
  • 2.13 Set the QoS level
  • 2.14 set CoAP option
  • 2.15 Get or Set Count value
  • 2.16 Set the downlink debugging mode(Since firmware v1.3.0)
  • 2.17 Domain name resolution settings(Since firmware v1.3.0)
• 3. Configure SN50v3-NB
  • 3.1 Configure Methods
  • 3.2  Serial Access Password
  • 3.3 AT Commands Set
• 4. Battery & Power Consumption
• 5. Firmware update
• 6.  Get and compile Software
• 7. FAQ
  • 7.1 How can I access the BC660K-GL AT Commands?
  • 7.2 Why can't the password access AT command after upgrade?
• 8. Order Info
• 9. ​Packing Info
• 10. Support
• 11. FCC Warning

1. Introduction

1.1 What is SN50v3-NB NB-IoT Sensor Node

SN50v3-NB is a Long Range NB-IoT Sensor Node.  It is designed to facilitate developers to quickly deploy industrial level NB-IoT solutions. It helps users to turn the idea into a practical application and make the Internet of Things a reality. It is easy to program, create and connect your things everywhere.

SN50v3-NB wireless part is based on NB model allows the user to send data and reach extremely long ranges at low data-rates.It provides ultra-long range spread spectrum communication and high interference immunity whilst minimising current consumption.It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, building automation, and so on.

SN50v3-NB uses STM32l0x chip from ST, STML0x is the ultra-low-power STM32L072xxxx microcontrollers incorporate the connectivity power of the universal serial bus (USB 2.0 crystal-less) with the high-performance ARM® Cortex®-M0+ 32-bit RISC core operating at a 32 MHz frequency, a memory protection unit (MPU), high-speed embedded memories (192 Kbytes of Flash program memory, 6 Kbytes of data EEPROM and 20 Kbytes of RAM) plus an extensive range of enhanced I/Os and peripherals.

SN50v3-NB is an open source product, it is based on the STM32Cube HAL drivers and lots of libraries can be found in ST site for rapid development.

SN50v3-NB supports different uplink methods including COAP, MQTT, MQTTs, UDP & TCP for different application requirement, and support uplinks to various IoT Servers.

SN50v3-NB supports BLE configure and OTA update which make user easy to use.

SN50v3-NB is powered by 8500mAh Li-SOCI2 battery, it is designed for long-term use up to several years.

SN50v3-NB has optional built-in SIM card and default IoT server connection version. Which makes it works with simple configuration.

1.2 ​Features

• NB-IoT Bands: B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B28/B66/B70/B85 @H-FDD
• Ultra-low power consumption
• Open-source hardware / software
• Multiply Sampling and one uplink
• Support Bluetooth v5.1 remote configure and update firmware
• Uplink via COAP, MQTT, MQTTs, TCP, or UDP
• Uplink on periodically
• Downlink to change configure
• 8500mAh Battery for long term use
• Nano SIM card slot for NB-IoT SIM

1.3 Specification

Common DC Characteristics:

• Supply Voltage: 2.5v ~ 3.6v
• Operating Temperature: -40 ~ 85°C

I/O Interface:

• Battery output (2.6v ~ 3.6v depends on battery)
• +5v controllable output
• 3 x Interrupt or Digital IN/OUT pins
• 3 x one-wire interfaces
• 1 x UART Interface
• 1 x I2C Interface

NB-IoT Spec:

NB-IoT Module: BC660K-GL

Support Bands:

• B1 @H-FDD: 2100MHz
• B2 @H-FDD: 1900MHz
• B3 @H-FDD: 1800MHz
• B4 @H-FDD: 2100MHz
• B5 @H-FDD: 860MHz
• B8 @H-FDD: 900MHz
• B12 @H-FDD: 720MHz
• B13 @H-FDD: 740MHz
• B17 @H-FDD: 730MHz
• B18 @H-FDD: 870MHz
• B19 @H-FDD: 870MHz
• B20 @H-FDD: 790MHz
• B25 @H-FDD: 1900MHz
• B28 @H-FDD: 750MHz
• B66 @H-FDD: 2000MHz
• B70 @H-FDD: 2000MHz
• B85 @H-FDD: 700MHz

Battery:

• Li/SOCI2 un-chargeable battery
• Capacity: 8500mAh
• Self Discharge: <1% / Year @ 25°C
• Max continuously current: 130mA
• Max boost current: 2A, 1 second

Power Consumption

• STOP Mode: 10uA @ 3.3v
• Max transmit power: 350mA@3.3v

1.4 Applications

• Smart Buildings & Home Automation
• Logistics and Supply Chain Management
• Smart Metering
• Smart Agriculture
• Smart Cities
• Smart Factory

1.5 Sleep mode and working mode

Deep Sleep Mode: Sensor doesn't have any NB-IoT activate. This mode is used for storage and shipping to save battery life.

Working Mode: In this mode, Sensor will work as NB-IoT Sensor to Join NB-IoT network and send out sensor data to server. Between each sampling/tx/rx periodically, sensor will be in IDLE mode), in IDLE mode, sensor has the same power consumption as Deep Sleep mode.

1.6 Button & LEDs

Note: When the device is executing a program, the buttons may become invalid. It is best to press the buttons after the device has completed the program execution.

1.7 BLE connection

SN50v3-NB support BLE remote configure and firmware update.

BLE can be used to configure the parameter of sensor or see the console output from sensor. BLE will be only activate on below case:

• Press button to send an uplink
• Press button to active device.
• Device Power on or reset.

If there is no activity connection on BLE in 60 seconds, sensor will shut down BLE module to enter low power mode.

1.8 Pin Definitions , Switch & SIM Direction

SN50v3-NB use the mother board which as below.

1.8.1 Jumper JP2

Power on Device when put this jumper.

1.8.2 BOOT MODE / SW1

1) ISP: upgrade mode, device won't have any signal in this mode. but ready for upgrade firmware. LED won't work. Firmware won't run.

2) Flash: work mode, device starts to work and send out console output for further debug

1.8.3 Reset Button

Press to reboot the device.

1.8.4 SIM Card Direction

See this link. How to insert SIM Card.

2. Use SN50v3-NB to communicate with IoT Server

2.1 Send data to IoT server via NB-IoT network

The SN50v3-NB is equipped with a NB-IoT module, the pre-loaded firmware in SN50v3-NB will get environment data from sensors and send the value to local NB-IoT network via the NB-IoT module.  The NB-IoT network will forward this value to IoT server via the protocol defined by SN50v3-NB.

Below shows the network structure:

There are two version: -GE and -1D version of SN50v3-NB.

GE Version: This version doesn't include SIM card or point to any IoT server. User needs to use AT Commands to configure below two steps to set SN50v3-NB send data to IoT server.

• Install NB-IoT SIM card and configure APN. See instruction of Attach Network.

• Set up sensor to point to IoT Server. See instruction of Configure to Connect Different Servers.  

Below shows result of different server as a glance.

Servers	Dash Board	Comments
Node-Red
DataCake
Tago.IO
General UDP	Raw Payload. Need Developer to design Dash Board
General MQTT	Raw Payload. Need Developer to design Dash Board
ThingSpeak
ThingsBoard

1D Version: This version has 1NCE SIM card pre-installed and configure to send value to DataCake. User Just need to select the sensor type in DataCake and Activate SN50v3-NB and user will be able to see data in DataCake. See here for DataCake Config Instruction.

2.2  Working Mode & Uplink Payload

2.2.1  CFGMOD=1 (Default Mode)

Here is the HEX format of the uplink payload for mode 1:

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

Device ID(f+IMEI): f863663062798914 = 863663062798914

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04:SN50v3-NB, 0x82=130=1.3.0

BAT:  0x0cdb = 3291 mV = 3.291V

Singal:  0x14 = 20

Model: 0x01 = 1

Temperature by DS18b20: 0x00f7 = 247/10=24.7

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

ADC: 0x0b94 =2964= 2964.00mv

Temperature by SHT20/SHT31: 0x010c = 268 = 26.8 °C

Humidity by SHT20/SHT31: 0x02db= 731 = 73.1 %rh

Timestamp: 673D9626 =1732089382= 2024-11-20 15:56:22

Connection mode of I2C sensor and DS18B20 temperature sensor:

Here is the JSON format of the uplink payload for mode 1:

Notice, from above payload:

• Mode, Battery, Signal, time, DS18B20_Temp, Digital_In, Interrupt, Interrupt_Level, adc1, Temperature & Humidity are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): Temperature, Humidity, ADC, DS18B20_Temp & Sampling time.

2.2.2  CFGMOD=2 (Distance Mode)

Here is the HEX format of the uplink payload for mode 2:

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

If the payload is  0xf863663062798914 f460083513507314 0482 0c7e 12 02 01b0 00 00 00 0ca8 00d8 673d9caf

where:

Device ID(f+IMEI): f863663062798914 = 863663062798914

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04:SN50v3-NB, 0x82=130=1.3.0

BAT:      0x0c7e = 3198mV = 3.198 V

Singal:  0x12 = 18

Model: 0x02 = 2

Temperature by DS18b20: 0x010b= 267 = 26.7  °

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

ADC: 0x0ca8 = 3240 mv

Distance by LIDAR-Lite V3HP/Ultrasonic Sensor: 0x00d8 = 216 cm

Timestamp: 0x673D9CAF = 1732091055 = 2024-11-20 16:24:15

Connection of LIDAR-Lite V3HP:

Connection to Ultrasonic Sensor:

Need to remove R1 and R2 resistors to get low power,otherwise there will be 240uA standby current.

Here is the JSON format of the uplink payload for mode 2:

Notice, from above payload:

• Mode, Battery, Signal, time, DS18B20_Temp, Digital_In, Interrupt, Interrupt_Level, adc1, Distance are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): Diatance , adc1, DS18B20_Temp& Sampling time.

2.2.3  CFGMOD=3 (3 ADC + I2C)

Here is the HEX format of the uplink payload for mode 3:

ADC1 uses pin PA4 to measure

ADC2 uses pin PA5 to measure

ADC3 uses pin PA8 to measure

(Suitable for motherboard version: LSN50 v3.3)

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

If the payload is : 0xf863663062798914 f460083513507314 0482 0cd8 0e 03 0b9b 00 00 00 0003 0115 0239 0000 673da2c4

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04:SN50v3-NB, 0x82=130=1.3.0

BAT:      0x0cd8 = 3288 mV = 3.288 V

Singal:  0x0e= 14

Model: 0x03 = 3

ADC1:  0x0b9b= 2971mV

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

ADC2: 0x0003 =3 mv

Temperature by SHT20/SHT31: 0x0115 = 277 = 27.7 °C

Humidity by SHT20/SHT31: 0x0239 =569 = 56.9 %rh

ADC3: 0x0000 = 0 mv

Timestamp: 0x673DA2C4 = 1732092612= 2024-11-20 16:50:12

Here is the JSON format of the uplink payload for mode 3:

Notice, from above payload:

• Mode, Battery, Signal, time, adc1, Digital_In, Interrupt, Interrupt_Level, adc2, temperature, humidity, adc3 are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): temperature, humidity,adc1, adc2, adc3 & Sampling time.

2.2.4  CFGMOD=4 (3 x DS18B20)

Here is the HEX format of the uplink payload for mode 4:

This mode has total 29 bytes. (Note: Time stamp field are added since firmware version v1.2.0)  As shown below:

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

If the payload is 0x f863663062798914 f460083513507314 0482 0cd6 11 04 0102 0003 00 00 00 0100 0102 673dade5

where:

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04:SN50v3-NB, 0x82=130=1.3.0

BAT: 0x0cd6 = 3286 mV = 3.286 V

Singal:  0x11 = 17

Model: 0x04 = 4

Temperature1 by DS18b20: 0x0102 = 258 = 25.8 °C

ADC: 0x0003 = 3 mv

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

Temperature2 by DS18b20: 0x0100 = 256 = 25.6°C

Temperature3 by DS18b20: 0x0102  = 258 = 25.8 °C

Timestamp: 0x673DADE5 = 1732095461= 2024-11-20 17:37:41

Here is the JSON format of the uplink payload for mode 4:

Notice, from above payload:

• Mode, Battery, Signal, time, DS18B20_Temp, adc1, Digital_In, Interrupt, Interrupt_Level, DS18B20_Temp2, DS18B20_Temp3 are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): ADC, DS18B20_Temp, DS18B20_Temp2, DS18B20_Temp3 & Sampling time.

2.2.5  CFGMOD=5 (Weight Measurement by HX711)

Here is the HEX format of the uplink payload for mode 5:

Notes about hardware connection:

1. Don't connect the HX711 module VCC to SN50v3-NB 3.3v VCC, in this case, the SN50v3-NB will always power on HX711 and the battery will run out soon.
2. HX711 support 5v VCC, but while connect the SN50v3-NB's +5V to HX711 VCC, the value from HX711 is not stable.
3. Connect SN50v3-NB +5V to HX711 VCC via a LDO module is stable.

Each HX711 need to be calibrated before used. User need to do below two steps:

1. Zero calibration. Don't put anything on load cell and run AT+WEIGRE to calibrate to Zero gram.
2. Adjust calibration factor (default value 400): Put a known weight thing on load cell and run AT+WEIGAP to adjust the Calibration Factor.

For example:

AT+WEIGAP =403.0

Response:  Weight is 401 g

Check the response of this command and adjust the value to match the real value for thing. 

This mode has total 27 bytes. (Note: Time stamp field are added since firmware version v1.2.0). As shown below:

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If the payload is 0x f863663062798914 f460083513507314 0482 0cce 15 05 0137 0b97 00 00 00 00f5 673e9440

where:

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04:SN50v3-NB, 0x82=130=1.3.0

BAT:      0x0cce = 3278mV = 3.278 V

Singal:  0x15 = 21

Model: 0x05 = 5

Temperature by DS18b20: 0x0137 = 311 = 31.1 °C

ADC: 0x0b97 = 2967 mv

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

Weigt by HX711: 0x00f5  = 245 g

Timestamp: 0x673E9440 = 1732154432 = 2024-11-21 10:00:32

Here is the JSON format of the uplink payload for mode 5:

Notice, from above payload:

• Mode, Battery, Signal, time, DS18B20_Temp, adc1, Digital_In, Interrupt, Interrupt_Level, weight are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): adc1, DS18B20_Temp, weight & Sampling time.

2.2.6  CFGMOD=6 (Counting mode)

Here is the HEX format of the uplink payload for mode 6:

If the cache upload mechanism is turned on, you will receive the payload shown in the figure below.

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT:      0x0ccb =3275mV =3.275V

Singal:  0x11 = 17

Model: 0x06 = 6

Pulse count:  0x00000000= 0

Timestamp:  0x673E9B1D = 1732156189= 2024-11-21 10:29:49

Here is the JSON format of the uplink payload for mode 6:

Notice, from above payload:

• Mode, Battery, Signal, time, count are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8 Command. Each entry includes (from left to right): Count & Sampling time.

2.2.7  CFGMOD=7 (3xADC + 3xDS18B20 mode)

Here is the HEX format of the uplink payload for mode 7:

In this mode, the uplink payload totals 161 bytes, including 25 bytes of real-time data and 16 bytes of timed acquisition data (8 groups are stored by default) (Note: Added since firmware version v1.2.4)

ADC1 uses pin PA4 to measure

ADC2 uses pin PA5 to measure

ADC3 uses pin PA8 to measure

(Suitable for motherboard version: LSN50 v3.3)

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If payload is:  0x f863663062798914 f460083513507314 0482 0cd8 12 07 00 00 00 0000 00eb 023c 00f4 00f8 00f3 673e9e7c

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT:      0x0cd8 = 3288 mV = 3.288 V

Singal:  0x12 =18

Model: 0x07 = 7

PA4_level: 0x00 =0

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

ADC1(PA4): 0x0000 = 0mV

ADC2(PA5):  0x00eb = 235mV

ADC3(PA8):  0x023c = 572mV

Temp1(PC13): 0x00f4 = 244/10 = 24.4℃

Temp2(PB9): 0x00f8 = 248/10 = 24.8℃

Temp3(PB8): 0x00f3  = 243/10 = 24.3℃

Timestamp: 0x673E9E7C = 1732157052 = 2024-11-21 10:44:12

Here is the JSON format of the uplink payload for mode 7:

Notice, from above payload:

• Mode, Battery, Signal, time, Digital_In, Interrupt, Interrupt_Level, adc1, adc2, adc3, DS18B20_Temp, DS18B20_Temp2, DS18B20_Temp3 are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): adc2, adc3, DS18B20_Temp, DS18B20_Temp2, DS18B20_Temp3 & Sampling time.

2.2.8  CFGMOD=8 (Three interrupts or three counting modes)

Here is the HEX format of the uplink payload for mode 8(a):

2.2.8.a Three interrupts modes:

In this mode, the uplink payload totals 124 bytes, including 20 bytes of real-time data and 12 bytes of timed acquisition data (8 groups are stored by default). (Note: Added since firmware version v1.2.4)

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If payload is: 0x f863663062798914 f460083513507314 0482 0cc3 11 08 0b9d 0102 00 00 01 01 00 00 673ea638

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT:  0x0cc3 = 3267 mV = 3.267 V

Singal:  0x11 = 17

Model:  0x08 = 8

ADC2(PA5): 0x0b9d = 2973mv

DS18B20_temp(PC13): 0x0102 = 258/10 = 25.8℃

Interrupt(PB15): 0x00 = 0

Interrupt_level(PB15): 0x00 = 0

Interrupt_pa4(PA4): 0x01 = 1 ,The uplink is triggered by an interrupt of the PA4 pin.

Interrupt_level_pa4(PA4): 0x01 = 1 ,The PA4 pin is triggered by a high level.

Interrupt_pa8(PA8): 0x00 = 0

Interrupt_level_pa8(PA8): 0x00 = 0

Timestamp: 0x673EA638 = 1732159032 = 2024-11-21 11:17:12

Here is the JSON format of the uplink payload for mode 8(a):

Notice, from above payload:

• Mode, Battery, Signal, Time, adc2(PA5), DS18B20_Temp, Interrupt(PB15), Interrupt_Level(PB15), interrupt_pa4, interrupt_level_pa4, interrupt_pa8, interrupt_level_pa8 are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right): adc2, DS18B20_Temp & Sampling time.

2.2.8.b Three counting modes:

Here is the HEX format of the uplink payload for mode 8(b):

In this mode, the uplink payload totals 158 bytes, including 22 bytes of real-time data and 16 bytes of timed acquisition data (8 groups are stored by default). (Note: Added since firmware version v1.2.4)

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If payload is : 0x f863663062798914 f460083513507314 0482 0cd4 10 08 00000005 0000000a 00000014 673eaa0d

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT: 0x0cd4 = 3284 mV = 3.284 V

Singal:  0x10 = 16

Model: 0x08 = 8

count1(PB15): 0x00000005 = 5

count2(PA4): 0x0000000a = 10

count3(PA8): 0x00000014 = 20

Timestamp: 0x673EAA0D = 1732160013 = 2024-08-31 13:37:40

Here is the JSON format of the uplink payload for mode 8(b):

Notice, from above payload:

• Mode, Battery, Signal, time, count1, count2, count3 are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8  Command. Each entry includes (from left to right):  count1, count2, count3 & Sampling time.

2.2.9  CFGMOD=9 (Count+SHT31 mode)

Here is the HEX format of the uplink payload for mode 9:

In this mode, the uplink payload totals 123 bytes, including 19 bytes of real-time data and 12 bytes of timed acquisition data (8 groups are stored by default)(Note: Added since firmware version v1.2.4)

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If payload is: 0x f863663062798914 f460083513507314 0482 0cc9 11 09 00 0000001b 010d 022c 673eacca

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT:  0x0cc9 = 3273 mV = 3.273 V

Singal:  0x11 = 17

Model: 0x09 = 9

digital in: 0x00 = 0( 0:low level; 1:high level)

count(PA8): 0x0000001b = 27

Temp(sht31): 0x010d = 269/10 = 26.9℃

Hum(sht31): 0x022c = 556/10 = 55.6%rh

Timestamp: 0x673EACCA = 1732160714 = 2024-11-21 11:45:14

Here is the JSON format of the uplink payload for mode 9:

Notice, from above payload:

• Mode, Battery, Signal, time, digital_in, count, temperature, humidity are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8 Command. Each entry includes (from left to right): temperature, humidity, count & Sampling time.

2.2.10  CFGMOD=10 (TMP117 Temperature Sensor Mode)

Here is the HEX format of the uplink payload for mode 10:

In this mode, the uplink payload totals 106 bytes, including 18 bytes of real-time data and 10 bytes of timed acquisition data (8 groups are stored by default)(Note: Added since firmware version v1.2.4)

If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NB sensor uplink data.

If payload is: 0x f863663062798914 f460083513507314 0482 0cdd 10 0a 010e 0000 00 00 0a01 673eaf5c

Device ID(f+IMEI): f863663062798914 = 863663062798914 

SIM Card ID(f+IMSI): f460083513507314 = 460083513507314

Version: 0x04: SN50v3-NB, 0x82=130=1.3.0

BAT: 0x0cdd = 3293 mV = 3.293 V

Singal:  0x10 = 16

Model: 0x0a = 10

DS18B20: 0x010e = 270/10 = 27.0℃

ADC1(PA4): 0x0000 = 0mV

Interrupt: 0x00 = 0

Interrupt_level: 0x00 =0

Temp(TMP117): 0x0a01 = 2561/100 = 25.61℃

Timestamp: 0x673EAF5C = 1732161372 = 2024-11-21 11:56:12

Here is the JSON format of the uplink payload for mode 10:

Notice, from above payload:

• Mode, Battery, Signal, time, DS18B20_Temp, adc1, interrupt, interrupt_level, temperature(TEM117) are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,1,8 Command. Each entry includes (from left to right): DS18B20_Temp, adc1, temperature(TEM117) & Sampling time.

2.3 ​Payload Types

To meet different server requirement, SN50v3-NB supports different payload type.

Includes:

• General JSON format payload. (Type=5)

• HEX format Payload. (Type=0)

• ThingSpeak Format. (Type=1)

• ThingsBoard Format. (Type=3)

User can specify the payload type when choose the connection protocol. Example:

AT+PRO=1,0            // Use COAP Connection & hex Payload

AT+PRO=1,5            // Use COAP Connection & Json Payload

AT+PRO=2,0            // Use UDP Connection & hex Payload

AT+PRO=2,5            // Use UDP Connection & Json Payload

AT+PRO=3,0            // Use MQTT Connection & Json Payload

AT+PRO=3,5            // Use MQTT Connection & Json Payload

AT+PRO=4,0            // Use TCP Connection & Json Payload

AT+PRO=4,5            // Use TCP Connection & Json Payload

2.3.1 General Json Format(Type=5)

This is the General Json Format. As below:

{"IMEI":"863663062798930","Model":"SN50V3-NB","mod":1,"battery":3.36,"signal":19,"DS18B20_Temp":-409.5,"digital_in":0,"interrupt":0,"interrupt_level":0,"adc1":2974,"temperature":26.9,"humidity":73.9,"1":[130.0,0.0,0,-409.5,"2024/05/24 01:20:14"],"2":[24.0,64.1,1,-409.5,"2024/05/24 00:53:05"],"3":[23.9,64.1,1,-409.5,"2024/05/24 00:38:05"],"4":[23.8,64.0,1,-409.5,"2024/05/24 00:23:05"],"5":[24.2,63.7,1,-409.5,"2024/05/24 00:08:05"],"6":[24.3,63.5,0,-409.5,"2024/05/23 23:53:05"],"7":[24.7,64.3,0,-409.5,"2024/05/23 23:38:05"],"8":[24.5,69.4,1,-409.5,"2024/05/23 23:23:05"]}

Notice, from above payload:

• Temperature , Humidity , Battery & Signal are the value at uplink time.

• Json entry 1 ~ 8 are the last 1 ~ 8 sampling data as specify by AT+CLOCKLOG=1,65535,15,8  Command. Each entry includes (from left to right): Temperature, Humidity, Sampling time.

2.3.2 HEX format Payload(Type=0)

This is the HEX Format. As below:

f863663062798930047b0d111301ffff0000000b92010b02d8664ff9770000f00105140000664feb4e0001f00100f00281664fe4f10001f00100ef0281664fe16d0001f00100ee0280664fdde90001f00100f2027d664fda650000f00100f3027b664fd6e10000f00100f70283664fd35d0001f00100f502b6664fcfd9

Note: Only hex payload contains PA4_level bytes, JSON payload does not contain PA4_level.

Version:

These bytes include the hardware and software version.

Higher byte: Specify Sensor Model: 0x04 for SN50v3

Lower byte: Specify the software version: 0x7b=123, means firmware version 1.2.3

BAT (Battery Info):

Ex1: 0x0d11 = 3345mV

Signal Strength:

NB-IoT Network signal Strength.

Ex1: 0x13 = 19

0        -113dBm or less

1        -111dBm

2...30 -109dBm... -53dBm

31      -51dBm or greater

99      Not known or not detectable

Temperature: 

If payload is: 0105H:  (0105 & 8000 == 0), temp = 0105H /10 = 26.1 degree

If payload is: FF3FH :  (FF3F & 8000 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.

(FF3F & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)

Humidity:   

Read:0295(H)=661(D)    Value:  661 / 10=66.1, So 66.1%

TimeStamp:   

Unit TimeStamp Example: 64d49439(H) = 1691653177(D)

Put the decimal value into this link(https://www.epochconverter.com/https://www.epochconverter.com/) to get the time.

2.3.3 ThingsBoard Payload(Type=3)

Type3 payload special design for ThingsBoard, it will also configure other default server to ThingsBoard.

{
    "topic": "2276492",
    "payload": {
        "IMEI": "863663062798930",
        "Model": "SN50V3-NB",
        "mod": 1,
        "battery": 3.3,
        "signal": 22,
        "DS18B20_Temp": -409.5,
        "digital_in": 0,
        "interrupt": 0,
        "interrupt_level": 0,
        "adc1": 2962,
        "temperature": 25.9,
        "humidity": 66.0,
        "1": [25.8, 65.5, 0, -409.5, "2024/05/27 03:29:46"],
        "2": [26.0, 67.6, 2968, -409.5, "2024/05/27 03:27:39"],
        "3": [26.2, 64.9, 2963, -409.5, "2024/05/27 03:26:39"],
        "4": [26.1, 65.7, 2961, -409.5, "2024/05/27 03:25:39"],
        "5": [26.2, 63.9, 2967, -409.5, "2024/05/27 03:25:15"],
        "6": [26.3, 63.9, 2971, -409.5, "2024/05/27 03:24:15"],
        "7": [25.7, 67.7, 2960, -409.5, "2024/05/27 03:20:27"],
        "8": [25.9, 64.4, 2963, -409.5, "2024/05/27 03:19:27"]
    }
}

2.3.4 ThingSpeak Payload(Type=1)

This payload meets ThingSpeak platform requirement. It includes only four fields. Form 1~8 are:

distance1, Battery, Signal, DS18B20_Temp, Interrupt_level, Interrupt, ADC,Temperature. This payload type only valid for ThingSpeak Platform.

Note: ThingSpeak has a maximum of eight fields, so the humidity curve is not on the graph.

As below:

field1=distance1 value&field2=battery value&field3=Signal value&field4=DS18B20_Temp value&field5=Interrupt_level value&field6=ADC value&field7=Temperature value&field8=Humidity value

2.4 Test Uplink and Change Update Interval

By default, Sensor will send uplinks every 2 hours 

User can use below commands to change the uplink interval.

AT+TDC=7200        // Set Update Interval to 7200s

User can also push the button for more than 1 seconds to activate an uplink.

2.5 Multi-Samplings and One uplink

Notice: The AT+NOUD feature is upgraded to Clock Logging, please refer Clock Logging Feature.

To save battery life, SN50v3-NB will sample temperature & humidity data every 15 minutes and send one uplink every 2 hours. So each uplink it will include 8 stored data + 1 real-time data. They are defined by:

• AT+TR=900        // The unit is seconds, and the default is to record data once every 900 seconds (15 minutes, the minimum can be set to 180 seconds)

• AT+NOUD=8     //  The device uploads 8 sets of recorded data by default. Up to 32 sets of record data can be uploaded.

The diagram below explains the relationship between TR, NOUD, and TDC more clearly:

2.6 Trggier an uplink by external interrupt

Feature, Set Interrupt mode for PB15,PA4,PA8.

AT command:AT+INTMOD

Example:

• AT+INTMOD=1,0,2   //Set the PB15 interrupt to be triggered by a rising or falling edge; set the PA4 interrupt function off and PA4 as a signal input pin; set the PA8 interrupt to be triggered by a falling edge.
• AT+INTMOD=0,1,3   //Set the PB15 interrupt function off and PB15 as a signal input pin; set the PA4 interrupt to be triggered by a rising or falling edge; set the PA8 interrupt to be triggered by a rising edge.

Downlink command: 0x06

Format: Command Code (0x06) followed by 3 byte.

Ex1: Downlink payload: 0x06010002   //Equal to AT+INTMOD=1,0,2

Ex2: Downlink payload: 0x06000103   //Equal to AT+INTMOD=0,1,3

2.7 +5V Output

Control the output duration 5V . Before each sampling, device will

1. first enable the power output to external sensor,

2. keep it on as per duration, read sensor value and construct uplink payload

3. final, close the power output.

AT command: AT+5VT

2.8 Analogue Digital Converter (ADC)

The ADC pins in SN50V3-NB can measure range from 0~Vbat, it use reference voltage from STM32. If user need to measure a voltage > VBat, please use resistors to divide this voltage to lower than VBat, otherwise, it may destroy the ADC pin.

Note: minimum VBat is 2.5v, when batrrey lower than this value. Device won't be able to send LoRa Uplink.

The ADC monitors the voltage on the PA0 line, in mV.

Ex: 0x021F = 543mv,

Note: If the ADC type sensor needs to be powered by SN50_v3, it is recommended to use +5V to control its switch.Only sensors with low power consumption can be powered with VDD.

The position of PA5 on the hardware after SN50 v3.3 is changed to the position shown in the figure below, and the collected voltage becomes one-sixth of the original.

2.9 Clock logging (Since firmware version v1.2.1)

Sometimes when we deploy lots of end nodes in field. We want all sensors sample data at the same time, and upload these data together for analyze. In such case, we can use clock loging feature.

We can use this command to set the start time of data recording and the time interval to meet the requirements of the specific collection time of data.

• AT command: AT+CLOCKLOG=a,b,c,d

a: 0: Disable Clock logging.   1: Enable Clock Logging

b: Specify First sampling start second: range (0 ~ 3599, 65535)         // Note: If parameter b is set to 65535, the log period starts after the node accesses the network and sends packets.

c: Specify the sampling interval: range (0 ~ 255 minutes)

d: How many entries should be uplink on every TDC (max 32)

Note: To disable clock recording, set the following parameters: AT+CLOCKLOG=1,65535,0,0

Example:

AT+CLOCKLOG=1,65535,1,5

After the node sends the first packet, data is recorded to the memory at intervals of 1 minute. For each TDC uplink, the uplink load will include: battery information + the last 5 memory records (payload + timestamp).

Note: Users need to synchronize the server time before configuring this command. If the server time is not synchronized before this command is configured, the command takes effect only after the node is reset.

• Downlink command: 0x0A  

Format: Command Code (0x0A) followed by 5 bytes.

• Example 1: Downlink Payload: 0A01FFFF0F08             // Set SHT record time: AT+CLOCKLOG=1,65535,15,8
• Example 1: Downlink Payload: 0A0104B00F08             // Set SHT record time: AT+CLOCKLOG=1,1200,15,8

Note: When entering the downlink payload, there must be no Spaces between bytes.

Unix TimeStamp

S31x-NB uses Unix TimeStamp format based on

User can get this time from link:  https://www.epochconverter.com/ :

Below is the converter example

So, 1725875962 means that the current time is Monday, September 9, 2024 at 9:59 AM.

Poll sensor value

User can poll sensor value based on timestamps from the server. Below is the downlink command.

Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period.

For example, downlink command 31 66DE 6384 66DE 7194

Is to check 2024/9/9 02:55:00 to 2024/9/9 03:55:00's data

Datalog Uplink payload

The Datalog poll reply uplink will use below payload format.

Retrieval data payload:

Function Description: This feature is only used when the clock logging feature is turned on. one uplink packet can send 64 groups of stored data totaling 512 bytes.

Example(For MQTT.fx):

If user sends below downlink command: 

Where : Start time: 60065F97 = time 24/9/9 02:55:00

             Stop time: 66DE6A8C= time 24/9/9 03:25:00

S31x-NB will uplink this payload.

0x0100024966de638b 0100024866de63c7 00ff024d66de6403 00ff024b66de643f 00ff024666de647b 0100024b66de64b7 00ff024f66de64f3 00ff024566de652f

Temp=0x0100/10=25.6℃

Hum=0x0249/10=58.5%rh

Unix time is 0x66de638b =1725850507s=24/9/9 02:55:00

2.10 Example Query saved historical records

• AT command: AT+CDP

This command can be used to search the saved history, recording up to 32 groups of data, each group of historical data contains a maximum of 100 bytes.

2.11 Uplink log query

• AT command: AT+GETLOG

This command can be used to query upstream logs of data packets.

2.12 Scheduled domain name resolution

This command is used to set up scheduled domain name resolution.

AT command:

• AT+DNSTIMER   // Unit: hour

After setting this command, domain name resolution will be performed regularly.

2.13 Set the QoS level

This command is used to set the QoS level of MQTT.

AT command:

• AT+MQOS    // 0~2

Downlink command: 0x07  

Format: Command Code (0x07) followed by 1 byte.

Ex1: Downlink payload: 0x0700   //AT+MQOS=0

Ex2: Downlink payload: 0x0701   //AT+MQOS=1

2.14 set CoAP option

This command sets the connection parameters of the COAP. 

AT command:

• AT+URI1~AT+URI4

Format:

• AT+URI1=CoAP option name, CoAP option length, "CoAP option value"

Example:

• AT+URI1=11,38,"i/faaa241f-af4a-b780-4468-c671bb574858"

2.15 Get or Set Count value

Feature,Get or set the count value and set the interrupt mode or count mode.(Note: Added since firmware version v1.2.4)

AT command:AT+EXT

Note: 

• There is no downlink command for this instruction, it can only be set through the serial port. 
• The format of AT instruction is: AT+EXT=0,0,0,1 or AT+EXT=0,0,0,0
• The last parameter of the current instruction sets the pin's operating mode to interrupt-triggered or count mode.(can only be set to 0 or 1)
• This command is valid only in mode 6 and mode 8.

2.16 Set the downlink debugging mode(Since firmware v1.3.0)

Feature: Set the conversion between the standard version and 1T version downlinks.

AT command: AT+DOWNTE

Example:

• AT+DOWNTE=0,1  //Set to standard version downlink, and enable downlink debugging.
• AT+DOWNTE=1,1  //Set to 1T version downlink, and enable downlink debugging.

Downlink Command:  

No downlink commands for feature

2.17 Domain name resolution settings(Since firmware v1.3.0)

Feature: Set dynamic domain name resolution IP.

AT command: AT+BKDNS

Example:

• AT+BKDNS=1,0        //Dynamic domain name resolution is disabled.
• AT+BKDNS=2,1        //The dynamic domain name resolution function is enabled and the automatic update time is set to 1 hour.
• AT+BKDNS=2,4,3.69.98.183,1883      //The dynamic domain name resolution function is enabled and the automatic update time is set to 4 hour, and manually set the ip address, if the domain name failed to resolve, it will directly use this ip to communicate. When the next domain name resolution is successful, it will be updated to the ip address of the successful resolution.

Downlink Command:  

No downlink commands for feature

3. Configure SN50v3-NB

3.1 Configure Methods

SN50v3-NB supports below configure method:

• AT Command via Bluetooth Connection (Recommended): BLE Configure Instruction.

• AT Command via UART Connection : See UART Connection.

3.2  Serial Access Password

After the Bluetooth or UART connection is successful, use the Serial Access Password to enter the AT command window.

The label on the box of the node will print the initial password: AT+PIN=xxxxxx, and directly use the six-digit password to access the AT instruction window.

If you need to change the password, use AT+PWORD=xxxxxx (6 characters), NB nodes only support lowercase letters.

Note: After entering the command, you need to add a line break, and you can also set automatic line breaks in the Bluetooth tool or UART connection tool.

3.3 AT Commands Set

AT+<CMD>?           : Help on <CMD>

AT+<CMD>                      : Run <CMD>

AT+<CMD>=<value>      : Set the value

AT+<CMD>=?          : Get the value

General Commands       

AT                    : Attention        

AT?                  : Short Help      

ATZ                  : Trig a reset of the MCU

AT+CFGMOD     : Working mode selection

AT+DEUI         : Get or set the Device ID

AT+PWORD    : Get or set the System password

AT+TDC          : Application Data Transmission Interval

AT+CFG          : Print all configurations

AT+5VT           : Set extend the time of 5V power   

AT+PRO          : Choose agreement

AT+APN          : Get or set the APN

AT+EXT           : Get or Set Count value

AT+RXDL            : Extend the sending and receiving time

AT+SERVADDR            :   Server Address

AT+WEIGRE              : Get weight or set weight to 0

AT+WEIGAP             : Get or Set the GapValue of weight

AT+CFGMOD           : Working mode selection

AT+INTMOD            : Set the trigger interrupt mode

AT+GETSENSORVALUE              : Returns the current sensor measurement

AT+CSQTIME            : Get or Set the time to join the network

AT+DNSTIMER      ：Regularly resolve domain names

AT+TLSMOD            : Get or Set the TLS mode

AT+CLOCKLOG   : Get or set SHT record time

AT+CDP             : Read or Clear cached data

AT+CUM              : Get or Set cache upload mechanism (0: Off 1: On)

AT+SERVADDR            :   Server Address

AT+DNSCFG         : Get or Set DNS Server

AT+MQOS            : Set the QoS level of MQTT

AT+SLEEP            : Get or Set the sleep mode

MQTT Management

AT+CLIENT               : Get or Set MQTT client

AT+UNAME              : Get or Set MQTT Username

AT+PWD                  : Get or Set MQTT password

AT+PUBTOPIC          : Get or Set MQTT publish topic

AT+SUBTOPIC          : Get or Set MQTT subscription topic

Information           

AT+FDR1             : Reset parameters to factory default values except for passwords

AT+FDR               : Factory Data Reset

AT+PWORD        : Serial Access Password

AT+LDATA           : Get the last upload data

AT+CDP               : Read or Clear cached data

AT+GETLOG       : Print serial port logs

COAP Management

AT+URI1            : Get or set CoAP option 1

AT+URI2            : Get or set CoAP option 2

AT+URI3            : Get or set CoAP option 3

AT+URI4            : Get or set CoAP option 4

4. Battery & Power Consumption

SN50v3-NB use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.

Battery Info & Power Consumption Analyze .

5. Firmware update

User can change device firmware to::

• Update with new features.

• Fix bugs. 

Firmware and changelog can be downloaded from : Firmware download link

Methods to Update Firmware:

• (Recommended way) OTA firmware update via BLE: Instruction.

• Update through UART TTL interface : Instruction.

6.  Get and compile Software

NBSN95 is an open-source project, developer can compile their firmware for customized applications. User can get the source code from:

• Software Source Code: https://github.com/dragino/SN50V3-NB
• Compile instruction:     http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Compile%20Instruction%20--%20STM32/
• Upgrade firmware instruction

7. FAQ

7.1 How can I access the BC660K-GL AT Commands?

User can access to BC660K-GL directly and send AT Commands.

See BC660K-GL AT Command set

7.2 Why can't the password access AT command after upgrade?

Refer to this link to view the password using STM32Cube Programmer.

8. Order Info

Part Number: SN50v3-NB-XX

XX: 

• GE: General version ( Exclude SIM card)

• 1T: with 1NCE * 10 years 500MB SIM card and Pre-configure to ThingsEye server

YY: The grand connector hole size

• M12: M12 hole

• M16: M16 hole

• M20: M20 hole

9. ​Packing Info

Package Includes:

• SN50v3-NB NB-IoT Sensor Node x 1

• External antenna x 1

Dimension and weight:

• Device Size: 13.0 x 5 x 4.5 cm

• Device Weight: 150g

• Package Size / pcs : 14.0 x 8x 5 cm

• Weight / pcs : 180g

10. Support

• Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.

• Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to Support@dragino.cc.

11. FCC Warning

Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

—Reorient or relocate the receiving antenna.

—Increase the separation between the equipment and receiver.

—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

—Consult the dealer or an experienced radio/TV technician for help.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator& your body.