CS01-FB/FS_ NB-IoT/LTE-M 4 Channels Current Sensor Converter

1. Introduction

1.1 What is NB-IoT/LTE-M 4 Channels Current Sensor Converter

The Dragino CS01-FB/FS is a NB-IoT/LTE-M 4 Channels Current Sensor Converter. It can convert the reading from current sensors and then upload to IoT server via NB-IoT or CAT-M1 network.

CS01-FB/FS can be used to monitor the machine running status and analyze power consumption trends.

The CS01-FB/FS supports maximum 4 current sensors. The current sensors are detachable and can be replaced with different scales.

CS01-FB/FS supports BLE configure and OTA update which make user easy to use.

CS01-FB/FS is powered by 8500mAh Li-SOCI2 battery or solar powered + 3000mAh Li-ion battery, it is designed for long-term use up to several years.

*make sure you have NB-IoT or CAT-M1 coverage locally.

1.2 Features

• NB-IOT Bands: B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B28/B66/B70/B85
• CAT-M1 / LTE-M Bands: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B27/B28/B66/B85
• Ultra-low power consumption
• Supports maximum 4 current sensors
• Support various current sensor Ratio: 50A, 100A etc.
• Monitor the machine running status
• Analyze power consumption trends
• Current Alarm
• Multiply Sampling and one uplink
• Support Bluetooth v5.1 remote configure and update firmware
• Uplink on periodically
• Downlink to change configure
• 8500mAh Li/SOCl2 Battery (CS01-FB)
• Solar panel + 3000mAh Li-ion battery (CS01-FS)
• Nano SIM card slot for NB-IoT SIM

1.3 Current Sensor Spec

The current sensor list below is not ship with CS01-FB/FS, user need to order seperately:

Model	Photo	Specification	Dimension(Unit:mm±0.5)
SCT013G-D-100		• Split core current transformer • Spec: 100A/50mA • φ16mm Aperture • Accuracy: ±1% *Wire length: 100cm; Wire length Accuracy: ±3cm
SCT024-300		• Split core current transformer • Spec: 300A/50mA • φ24mm Aperture • Accuracy: ±0.5% /Class 0.2 *Wire length: 100cm; Wire length Accuracy: ±3cm
SCT036-600		• Split core current transformer • Spec: 600A/50mA • φ36mm Aperture • Accuracy: ±0.5% / Class 0.2 *Wire length: 100cm; Wire length Accuracy: ±3cm

Note for Accuracy Specification:

The accuracy values listed in the table represent the current clamp's intrinsic accuracy only. For the CS01-FB/FS system, the overall measurement accuracy includes both the current clamp and the current sampling module. The current sampling module has an accuracy of ±1%. Therefore, the total system accuracy will be a combination of both.

1.4 Specification

Common DC Characteristics:

• Supply Voltage: Built-in Battery , 2.5v ~ 3.6v
• Operating Temperature: -40 ~ 85°C

NB-IoT Spec:

NB-IoT Module: nRF9151-NGFF

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: 14uA @ 3.3v
• Max transmit power: 350mA@3.3v

1.5 Applications

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

1.6 Sleep mode and working mode

Deep Sleep Mode: Sensor doesn't have any NB-IoT/CAT-M1 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.

1.7 Button & LEDs

Behavior on ACT	Function	Action
1~3s	Send an uplink	If sensor has already attached to NB-IoT/CAT-M1 network, sensor will send an uplink packet, blue led will blink once. Meanwhile, BLE module will be active and user can connect via BLE to configure device.
>3s	Active Device	Green led will fast blink 5 times. And then start to attach NB-IoT/CAT-M1 network. Once sensor is active, BLE module will be active and user can connect via BLE to configure device, no matter if device attach NB-IoT/CAT-M1 network or not.
x5	Deactivate Device	Red led will solid on for 5 seconds. Means device is in Deep Sleep Mode.
x1	Toggle Serial Communication	Press the ACT button once to activate the serial communication function, and Ready will be displayed in the serial tool. Press the ACT button once again to disable the serial communication function. The green led will turn on when the button is pressed, and then the red led will blink once to indicate that the serial communication has been disabled.

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.

1.8 BLE connection

CS01-FB/FS 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.

1.9 Pin Definitions , Switch & SIM Direction

CS01-FB/FS use the mother board which as below.

1.9.1 Jumper JP2

Power on Device when put this jumper.

Power off device when take out this jumper

1.9.2 BOOT MODE / SW1

This switch does not actually control the NRF9151 chip, so by default, please set this switch to “Flash”.

1.9.3 Reset Button

Press to reboot the device.

1.9.4 SIM Card Direction

See this link. How to insert SIM Card.

1.10 Mechanical

1.10.1 for FB version

1.10.2 for FS version

1.10.3 for FB2 version

1.10.4 Regarding the size of the sensor

100A:

300A:

600A:

2. Use CS01-FB/FS to communicate with IoT Server

2.1 Send data to IoT server via NB-IoT network

The CS01-FB/FS is equipped with a NB-IoT module, the pre-loaded firmware in CS01-FB/FS 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 CS01-FB/FS.

Below shows the network structure:

There are two version: -GE and -1T version of CS01-FB/FS. **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 CS01-FB/FS 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

1T Version: This version has 1NCE SIM card pre-installed and configure to send value to ThingsEye. User Just need to select the sensor type in ThingsEyeand Activate CS01-FB/FS and user will be able to see data in ThingsEye. See here for ThingsEye Config Instruction.

2.2 Payload Types

To meet different server requirement, CS01-FB/FS supports different payload type.

Includes:

• General JSON format payload.(Type=0)

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

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

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

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

2.3 Working Mode & Uplink Payload

2.3.3 General Json Format

{"IMEI":"355025936334455","IMSI":"460240275257959","Model":"CS01-FB","fcnt":"18","signal":"26","bat":3.49,"current1":0.024,"current2":0.004,"current3":0.002,"current4":0.002,"temp1":0.0,"temp2":0.0,"L1":"0","H1":"0","L2":"0","H2":"0","L3":"0","H3":"0","L4":"0","H4":"0","i_flag":"0","time":"2026-9-27T08:59:07Z","latitude":0.000000,"longitude":0.000000,"gps_time":"00/00/00,00:00:00","1":["0.02,0.00,0.00,0.00,2026-9-27T08:55:02Z"],"2":["0.02,0.00,0.00,0.00,2026-9-27T08:55:07Z"],"3":["0.02,0.00,0.00,0.00,2026-9-27T08:56:02Z"],"4":["0.02,0.00,0.00,0.00,2026-9-27T08:57:02Z"],"5":["0.02,0.00,0.00,0.00,2026-9-27T08:57:07Z"],"6":["0.02,0.00,0.00,0.00,2026-9-27T08:58:02Z"],"7":["0.02,0.00,0.00,0.00,2026-9-27T08:59:02Z"],"8":["0.02,0.00,0.00,0.00,2026-9-27T08:59:07Z"]}

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

Notice, from above payload:

• Current1, Current2, Current3, Current4, L1, H1, L2, H2, L3, H3, L4, H4, i_flag, Battery, Signal, time, latitude, longitude & gps_time 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): Current1, Current2, Current3, Current4, Sampling time.

**Device ID(IMEI):**355025936334455

**SIM Card ID(IMSI):**460240275257959

Model: CS01-FB or FS

Battery Info:

Check the battery voltage for CS01-FB/FS.

Ex1: 3.49V = 3490mV

Ex2: 2.889V = 2889mV

Signal Strength:

NB-IoT Network signal Strength.

Ex1: 26

0 -113dBm or less

1 -111dBm

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

31 -51dBm or greater

99 Not known or not detectable

i_flag:

GPIO_EXTI is used as Interrupt Pin.

This data field shows if this packet is generated by Interrupt Pin or not.

Note: The Interrupt Pin is a separate pin in the screw terminal.

Example:

0x00: Normal uplink packet.

0x01: Interrupt Uplink Packet.

L1:

When setting the current threshold alarm for Channel 1, if the current value is below the set threshold, this flag is set to 1; otherwise, it is set to 0.

H1:

When setting the current threshold alarm for Channel 1, this flag is set to 1 if the current value exceeds the set threshold; otherwise, it is set to 0.

L2:

When setting the current threshold alarm for Channel 2, if the current value falls below the set threshold, this flag is set to 1; otherwise, it is set to 0.

H2:

When setting the current threshold alarm for Channel 2, if the current value exceeds the set threshold, this flag is set to 1; otherwise, it is set to 0.

L3:

When setting the current threshold alarm for Channel 3, if the current value falls below the set threshold, this flag is set to 1; otherwise, it is set to 0.

H3:

When setting the current threshold alarm for Channel 3, if the current value exceeds the set threshold, this flag is set to 1; otherwise, it is set to 0.

L4:

When setting the current threshold alarm for Channel 4, if the current value falls below the set threshold, this flag is set to 1; otherwise, it is set to 0.

H4:

When setting the current threshold alarm for Channel 4, if the current value exceeds the set threshold, this flag is set to 1; otherwise, it is set to 0.

Latitude:

EX1: 0.000000 // Locating fails or is not enabled.

EX2: 22.705950 // Latitude is 22.705950

Longitude:

EX1: 0.000000 // Locating fails or is not enabled.

EX2: 114.242500 // Longitude is 114.242500

gps_time:

EX1: 00/00/00,00:00:00 // The value is "00/00/00,00:00:00" in JSON format. The initial GPS time is not refreshed if GPS positioning is disabled or fails.

EX2: 2024-07-01 15:23:09 // The location was determined at 2024-07-01 15:23:09

Current1:

Channel 1 for measuring AC current. Resolution 0.001A.

Ex1: 4.095A

EX2: 10.000A

Current2:

Channel 2 for measuring AC current. Resolution 0.001A.

Ex1: 4.082A

Ex2: 10.500A

Current3:

Channel 3 for measuring AC current. Resolution 0.001A.

Ex1: 4.156A

Ex2: 11.000A

Current4:

Channel 4 for measuring AC current. Resolution 0.001A.

Ex1: 0.002A

Ex2: 12.000A

TimeStamp:

Unit TimeStamp Example: 2026-9-27T09:23:08Z

3. Configure CS01-FB/FS

3.1 Configure Methods

CS01-FB/FS 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+MODEL : Get module information

ATZ : Trig a reset of the MCU

AT+DEUI : Get or set the Device ID

AT+SLEEP : Get or set the sleep status

AT+DEBUG : Set more info output

AT+SERVADDR: Get or Set the Server address

AT+TDC : Get or set the application data transmission interval in s

AT+INTMOD : Get or Set the trigger interrupt mode (0:input,1:falling or rising,2:falling,3:rising)

AT+APN : Get or set the APN

AT+AUNAME : Get or set the APN username

AT+APWD : Get or set the APN password

AT+3V3T : Get or Set extend the time of 3V3 power

AT+PROPORTION: Set the current proportion parameter

AT+PRO : Get or Set usage agreement (1:COAP,2:UDP,3:MQTT,4:TCP)

AT+RXDL : Get or Set the receiving time

AT+GETSENSORVALUE : Returns the current sensor measurement

AT+IPTYPE : Set the IPv4 or IPv6

AT+QSW : Power on and power off BG95 module

AT+MOD: Get or Set work mode

AT+ENCHANNEL: Get or set enable or disable of four channels

AT+CCAL: Get or set calibration value of current channel

AT+IOTMOD: Configure Network Category to be Searched for under LTE RAT

AT+CLOCKLOG: Enable or Disable Clock Logging

AT+TIMESTAMP : Get or Set UNIX timestamp in second

AT+UDPMOD: Get or set UDP working mode

AT+REDPT: Get or Set the function of reconnecting the network to send data

AT+SFNT: Get or set search for network time

MQTT Management

AT+CLIENT : Get or Set the MQTT clientID

AT+UNAME : Get or Set the MQTT Username

AT+PWD : Get or Set the MQTT password

AT+PUBTOPIC: Get or set MQTT publishing topic

AT+SUBTOPIC: Get or set MQTT subscription topic

AT+MQOS : Set the QoS level of MQTT

AT+TLSMOD : Get or Set the TLS mode

GPS

AT+GTIME : Extend the time to turn on GNSS

AT+QGPS : Turn off and on GPS

AT+QGTDC : Get or set GPS positioning interval in units of h

Information

AT+PWORD : Get or set the System password

AT+FDR : Reset Parameters to Factory Default

AT+CFG : Print all settings

AT+CDP : Read or Clear cached data

AT+LDATA : Get the last upload data

AT+GETLOG : Print serial port logs

AT+RANGE:Set or get the range of AC transformer

3.4 Test Uplink and Change Update Interval

By default, Sensor will send uplinks every 20 min.

User can use below commands to change the uplink interval.

AT Command: AT+TDC

Example: AT+TDC=7200 // Set Update Interval to 7200 seconds

Downlink Commands: 0x01

Format: Command Code (0x01) followed by 3 bytes.

Example: 12 hours= 43200 seconds 43200(D)=0xA8C0(H)

                Downlink Payload: `01 00 A8 C0`          // AT+TDC=43200, Set Update Interval to 12 hours.

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

3.5 Set the receiving time

Feature: Extend the receiving time

AT Command: AT+RXDL

Example: AT+RXDL=1000 // Set the receiving time delay to 1000ms

Downlink Commands: 0x03

Format: Command Code (0x03) followed by 3 bytes.

Example: Downlink Payload: 03 00 03 E8// AT+RXDL=1000

3.6 Reset

Feature: Trig a reset of the MCU.

AT Command: ATZ

Downlink Commands: 0x04FF

3.7 Set Power Output Duration

Control the output duration 3V3(pin of VBAT_OUT) . 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+3V3T

Command Example	Function	Response
AT+3V3T=?	Show 3V3 open time.	0 (default) OK
AT+3V3T=1000	Close after a delay of 1000 milliseconds.	OK
AT+3V3T=0	Always turn on the power supply of 3V3 pin.	OK
AT+3V3T=65535	Always turn off the power supply of 3V3 pin.	OK

Downlink Command: 0x07 Format: Command Code (0x07) followed by 3 bytes.

The first byte is 01,the second and third bytes are the time to turn on.

• Example 1: Downlink Payload: 07 01 00 00 ---> AT+3V3T=0
• Example 2: Downlink Payload: 07 01 01 F4 ---> AT+3V3T=500
• Example 3: Downlink Payload: 07 01 FF FF ---> AT+3V3T=65535

3.8 Trigger an uplink by external interrupt

CS01-FB/FS has an external trigger interrupt function. Users can use the GPIO_EXTI pin to trigger the upload of data packets.

AT command:

• AT+INTMOD // Set the trigger interrupt mode

• AT+INTMOD=0 // Disable Interrupt

• AT+INTMOD=1 // Trigger by rising and falling edge

• AT+INTMOD=2 // Trigger by falling edge

• AT+INTMOD=3 // Trigger by rising edge

Downlink Commands: 0x06

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

Example1: Downlink Payload: 06 00 00 01// AT+INTMOD=1

Example2: Downlink Payload: 06 00 00 03// AT+INTMOD=3

3.9 Set the QoS level

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

AT command:

• AT+MQOS=xx// 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

3.10 Clock logging(Takes effect only when AT+MOD=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=1,65535,1,8

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:**0x03

Format: Command Code (0x03) followed by 5 bytes.

• Example 1: Downlink payload:0x030116800105 // Same as AT+CLOCKLOG=1,5760,1,5
• Example 2: Downlink payload:0x030000000000 // Same as AT+CLOCKLOG=0,0,0,0

3.11 Set the TLS mode

Refer to this link (MQTT Connection to send data to MQTT platformto)to use the TLS mode.

**AT Command:**AT+TLSMOD

Example 1: AT+TLSMOD=0,0 // Disable TLS Mode.

Example 2: AT+TLSMOD=1,0 // No authentication

AT+TLSMOD=1,1 // Perform server authentication

AT+TLSMOD=1,2 // Perform server and client authentication if requested by the remote server

**Downlink command:**0x09

Format: Command Code (0x09) followed by 2 bytes.

Example1: Downlink Payload: 09 00 00// AT+TLSMOD=0,0

Example2: Downlink Payload: 09 01 02// AT+TLSMOD=1,2

3.12 Set the search network time

Feature: Get or Set the time to join the network(unit: minutes).

AT Command: AT+SFNT

Example: AT+SFNT=10 // Set the search time to 10 minutes.

Downlink command: 0x13

Format: Command Code (0x13) followed by 1 byte.

Example: Downlink Payload: 13 0A// AT+SFNT=10

3.13 Set GTIME open time

Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated.

AT Command: AT+GTIME

Example: AT+GTIME=30 // Set the GPS positioning time to 30 seconds

Downlink command: 0x10

Format: Command Code (0x10) followed by 2 bytes.

Example: Downlink Payload: 10 00 1E // AT+GTIME=30

3.14 Turn on/off GPS

AT Command: AT+QGPS

• Ex1: AT+QGPS=0 // Turn off GPS
• Ex2: AT+QGPS=1 // Turn on GPS

Downlink command: 0x11

Format: Command Code (0x11) followed by 1 byte.

Example: Downlink Payload: 11 01 // AT+QGPS=1

3.15 Set GPS positioning interval

Feature: Set GPS positioning interval (unit: hour).

When GPS is enabled, the node automatically locates and uplinks each time it passes GTDC time after activation.

AT Command: AT+QGTDC

Example: AT+QGTDC=24 // Set the GPS positioning interval to 24h.

Downlink command: 0x12

Format: Command Code (0x12) followed by 3 bytes.

Example: 24 hours: 24(D)=0x18(H)

Downlink Payload: 12 00 00 18 // AT+QGTDC=24

3.16 Set the search network time

Feature: Get or Set the time to join the network(unit: minutes).

AT Command: AT+CSQTIME

Example: AT+CSQTIME=10 // Set the search time to 10 minutes.

Downlink command: 0x13

Format: Command Code (0x13) followed by 1 byte.

Example: Downlink Payload: 13 0A// AT+CSQTIME=10

3.17 Set the alarm threshold

Feature, Get or set current alarm threshold. (Takes effect only when AT+MOD=1)

Note: the units of the third, fifth, seventh, and ninth parameters are mA.

AT Command: AT+CALARM

Command Example	Function	Parameter
AT+CALARM= 1,1,10000,0,20000,0,0,0,0	The first parameter enables or disables the threshold alarm.	0: Not Alarm 1: Alarm
	The second and third parameters set "current 1" below threshold alarm or above threshold alarm.	0,xx: Means if value <xx, Then Alarm 1,xx: Means if value >xx, Then Alarm eg:1,10000: if value >10000mA(10A), Then Alarm
	The fourth and fifth parameters set "current 2" below the threshold alarm or above the threshold alarm.	0,xx: Means if value <xx, Then Alarm 1,xx: Means if value >xx, Then Alarm eg:0,20000: if value <20000mA(20A), Then Alarm
	The sixth and seventh parameters set "current 3" below the threshold alarm or above the threshold alarm.	0,0: Means if value <xx, Then Alarm 0,0: Means if value >xx, Then Alarm eg:0,0: Disable this channel alarm
	The eighth and ninth parameters set "current 4" below the threshold alarm or above the threshold alarm.	0,0: Means if value <xx, Then Alarm 0,0: Means if value >xx, Then Alarm eg:0,0: Disable this channel alarm

Downlink Command: 0x0B

Format: Command Code (0x0B) followed by 17 bytes.

• Example 1: Downlink Payload: 0B 01 01 00 27 10 00 00 4E 20 00 00 00 00 00 00 00 00 ---> AT+CALARM=1,1,10000,0,20000,0,0,0,0 =>1(01),1(01),10000(00 27 10),0(00),20000(00 4E 20),0(00),0(00 00 00),0(00),0(00 00 00)
• Example 2: Downlink Payload: 0B 01 00 00 00 00 00 00 00 00 00 00 03 E8 01 00 07 D0 ---> AT+CALARM=1,0,0,0,0,0,1000,1,2000 =>1(01),0(00),0(00 00 00),0(00),0(00 00 00),0(00),1000(00 03 E8),1(01),2000(00 07 D0)
• Example 3: Downlink Payload: 0B 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ---> AT+CALARM=0,0,0,0,0,0,0,0,0 =>0(00),0(00),0(00 00 00),0(00),0(00 00 00),0(00),0(00 00 00),0(00),0(00 00 00)

Format: The first byte(Command Code ) is 0x0B, the last byte is 0x01 or 0x02, and the middle 9 bytes.

 When the last byte is 0x01, you can set the first, second, third, fourth and fifth parameters of the AT command.

• Example 1: Downlink Payload: 0B 01 01 00 27 10 00 00 4E 20 01 ---> AT+CALARM=1,1,10000,0,20000,0,0,0,0 =>1(01),1(01),10000(00 27 10),0(00),20000(00 4E 20)

  When the last byte is 0x02, you can set the first, sixth, seventh, eighth and ninth parameters of the AT command.

• Example 2: Downlink Payload: 0B 01 00 00 03 E8 01 00 07 D0 02 ---> AT+CALARM=1,0,0,0,0,0,1000,1,2000 =>1(01),0(00),1000(00 03 E8),1(01),2000(00 07 D0)

Format: Command Code (0x0B) followed by 9 bytes.

• Example 1: Downlink Payload: 0B 01 01 14 01 14 00 00 00 00 ---> AT+CALARM=1,1,20,1,20,0,0,0,0 (v1.0 version) =>1(01),1(01),20(14),1(01),20(14),0(00),0(00),0(00),0(00)
• Example 2: Downlink Payload: 0B 01 01 14 01 14 00 00 00 00 ---> AT+CALARM=1,1,20000,1,20000,0,0,0,0 (Versions after v1.1) =>1(01),1(01),20(14),1(01),20(14),0(00),0(00),0(00),0(00)
• Example 3: Downlink Payload: 0B 00 00 00 00 00 00 00 00 00 ---> AT+CALARM=0,0,0,0,0,0,0,0,0 =>0(00),0(00),0(00),0(00),0(00),0(00),0(00),0(00),0(00)

3.18 Set enable or disable of the measurement channel

This command can be used when user connects less than four current sensors. This command can turn off unused measurement channels to save battery life. AT Command: AT+ENCHANNEL

Command Example	Function	Response
AT+ENCHANNEL=?	Get enabled channels.	1,1,1,1 (default) OK
AT+ENCHANNEL=1,1,1,0	Channel 4 disabled.	OK
AT+ENCHANNEL=1,1,0,0	Channel 3 and 4 disabled.	OK

Downlink Command: 0x08

Format: Command Code (0x08) followed by 4 bytes.

The first byte means the first channel, the second byte means the second channel, the third byte means the third channel, and the fourth byte means the fourth channel.And 1 means enable channel, 0 means disable channel.

• Example 1: Downlink Payload: 08 01 01 01 01 ---> AT+ENCHANNEL=1,1,1,1 // All channels are enabled

• Example 2: Downlink Payload: 08 01 01 01 00 ---> AT+ENCHANNEL=1,1,1,0 // Channel 4 disabled

• Example 3: Downlink Payload: 08 01 01 00 00 ---> AT+ENCHANNEL=1,1,0,0 // Channel 3 and 4 disabled

3.19 Set the current proportion parameter

This command sets the processing multiplier of the actual value to get the displayed value.

The default current ratio parameter is 100, meaning the displayed value equals the actual value multiplied by 1, which is suitable for a standard 100A current transformer.

The valid range is 0 to 65535 (cannot be set to 0). If this value is set to 1000, the displayed value will be 10 times the actual value.

AT Command: AT+PROPORTION

Command Example	Function	Response
AT+PROPORTION=?	Get the current proportion parameter	100 (Default) OK
AT+PROPORTION=1	Set the displayed value to 1/100 of the actual value	OK
AT+PROPORTION=300	Setting the display value to 3 times the actual value	OK

Downlink Command: 0x0D

Format: Command Code (0x0D) followed by 2 bytes.

• Example 1: Downlink Payload: 0D 00 64 ---> AT+PROPORTION=100 // Set the displayed value to the actual value multiplied by 1, which is suitable for standard 100A current transformers.
• Example 2: Downlink Payload: 0D 01 2C ---> AT+PROPORTION=300 // Set the displayed value to the actual value multiplied by 3,which is suitable for standard 300A current transformers.
• Example 3: Downlink Payload: 0D 02 58 ---> AT+PROPORTION=600 // Set the displayed value to the actual value multiplied by 6,which is suitable for standard 600A current transformers.

Note: When using this command to set the current ratio parameter, it will simultaneously apply to all four channels. For example, setting AT+PROPORTION=300 means all four channels will use 300A CTs. If you need to use CTs with different measurement ranges across the four channels, please refer to FAQ 7.2.

3.20 Configure Network Category to be Searched for under LTE RAT.

NOTE

By default, the NB-IoT network is turned off, and only the LTE-M network is enabled. If a user needs to use the NB-IoT network, they must enable it themselves.

AT command: AT+IOTMOD=a,b,c

a: 0: Disenable eMTC; 1: Enable eMTC

b: 0: Disenable NB-IoT ; 1. Enable NB-IOT

c: Priority: If two network categories are enabled simultaneously, the device will give priority to the configured category.

Ext1: AT+IOTMOD=1,1,2 ----> Indicates that both eMTC and NB-IoT are enabled, with priority given to the NB-IoT network type.

3.21 Factory data reset

Two different restore factory Settings configurations.

AT command:

• AT+FDR// Reset Parameters to Factory Default.

3.22 Uplink log query

• AT command: AT+GETLOG

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

3.23 Get data

Feature: Get the current sensor data.

AT Command:

• AT+GETSENSORVALUE=0 // The serial port gets the reading of the current sensor
• AT+GETSENSORVALUE=1 // The serial port gets the current sensor reading and uploads it.

3.24 Print last few data entries

Feature: Print the last few data entries

AT command: AT+PLDTA

Command Example

4 bytes

AT+PLDTA=5 Print last 5 entries

Stop Tx events when read sensor data 0001 2026/9/28 09:07:33 3488 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 0002 2026/9/28 09:08:33 3484 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 0003 2026/9/28 09:09:33 3488 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 0004 2026/9/28 09:10:06 3484 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 0005 2026/9/28 09:10:33 3492 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 OK

Downlink Command:

No downlink commands for feature

3.25 Print data entries base on page

Feature: Print the sector data from start page to stop page.

AT command: AT+PDTA

Command Example

4 bytes

AT+PDTA=1,1 Print page 1 to 1

Stop Tx events when read sensor data E8000 2026/9/27 09:07:02 3492 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8010 2026/9/27 09:07:07 3484 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8020 2026/9/27 09:08:02 3492 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8030 2026/9/27 09:09:02 3492 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8040 2026/9/27 09:09:07 3484 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8050 2026/9/27 09:10:02 3492 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8060 2026/9/27 09:11:02 3484 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 E8070 2026/9/27 09:11:07 3488 I1=0.02 I2=0.00 I3=0.00 I4=0.00 trrig:false level:0 OK

Downlink Command:

No downlink commands for feature

3.26 Clear Flash Record

Feature: Clear flash storage for data log feature.

AT command: AT+CLRDTA

Command Example	Function	Response
AT+CLRDTA	Clear date record	Stop Tx events,Please wait for the erase to complete Clear all stored sensor data... Start Tx events OK

Downlink Command: 0x32

• Example: 0x32 00 // Same as AT+CLRDTA

4. Use Case

4.1 Monitor the power status of office

This is a case study for CS01-FB/FS current sensor. It shows how to use CS01 to monitor office power use status.

Click here for more: Case 1: Monitor the power status of office

5. Battery & Power Consumption

CS01-FB/FS use ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.

NOTE

To be updated

6. Firmware update

6.1 Over-the-Air (OTA) Firmware Update via HTTP

Note: Users can upload the firmware binary to any public HTTP server (not a local/private network address) that the device can access, then use the following method to upgrade

Perform the following steps:

① Place the firmware binary (e.g., S31-FB.bin) on an HTTP-accessible server.

② Use a serial port or send the following command to the device: AT+UPGRADE="<firmware_url>"

Example: AT+UPGRADE=1,"http://repo.dragino.com/release/NB/S31-FB.bin

After the node receives the upgrade command via downlink, it will perform the upgrade automatically as shown below:

6.2 Firmware Update via J-Link Interface

Use this method if OTA is not available or if the device is unresponsive.

Prerequisites:

• An ARM emulator (J-Link compatible)
• Firmware update tool: nRF Connect for Desktop

Note: During the installation of nRF Connect for Desktop, you will be prompted to install the J-Link driver. You must confirm the installation; otherwise, the J-Link external tool will not be recognized.

6.2.1 Hardware Connection

Remove the NRF9151 module from the motherboard and connect it to the J-Link as illustrated below:

NRF9151 Module Hardware Wiring:

6.2.2 Software Setup

Launch nRF Connect for Desktop.

Locate and download the Programmer tool from the available apps (see below):

After download, click OPEN to enter the Programmer interface.

6.2.3 Firmware Update Steps

Click "SELECT DEVICE" → Select "J-Link"

On the main screen, click "Add file", then click "Browse" and select the firmware you want to update in the pop-up window.

Click “Erase & Write” to begin the update

7. FAQ

7.1 Why can't current clamps measure current over range?

First, we take the SCT036-600 as an example to explain the specifications of the current clamp.

Meaning of *Spec: 600A/50mA :

• 600A: Indicates the rated primary current of the current transformer. This means the clamp is designed to measure up to 600A on the primary side under normal operating conditions.
• 50mA: Indicates the rated secondary output current. When 600A flows through the primary, the secondary will output 50mA.

Why can't you measure current over range:

Reduced accuracy: Exceeding the range will lead to increased measurement errors and inaccurate results.

Equipment damage: Excessive current may damage the sensor or circuit inside the current clamp.

Safety risks: Over-range measurement may cause overheating, short circuit and other problems, resulting in safety risks.

7.2 How to modify Payload to match 100A/300A/600A sensors respectively?

When using 300A or 600A current transformers, discrepancies may occur between the measured current values and actual readings due to parameter ratio inconsistencies

Users need to amplify the current readings in equal proportions:

When users use 300A transformers, they need to amplify the current readings by 3 times.

When users use 600A transformers, they need to amplify the current readings by 6 times.

There are two ways:

1. You can use the AT+PROPORTION command to simultaneously control the amplification of 4 channels to the same multiple. For specific usage, please refer to: AT+PROPORTION

2. If the 4 channels use sensors with different ranges, you need to change the output ratio in decoding. The operation is as follows:

When the user uses the json format, the user can create a new parameter in the application server and change the current reading x3/x6.

Example:

If you use the uplink when the format is JSON:

• var actual reading = current_chan1 * 3
• var actual reading2 = current_chan2 * 3

7.3 Why are the collected current values inaccurate?

When the current value collected by the node is inaccurate, please check whether the calibration value is set by the AT+CCAL command in the node. If so, please change the calibration value to 0, that is: AT+CCAL=0,0,0,0.

7.4 Why is there no LED response when I press the button on the solar panel model?

If the LED does not light up when you press the button, it may be because the battery has entered protection mode.

Solution: To reactivate the battery, simply expose the solar panel to direct sunlight. For more details, please refer to: Battery Protection State (Apply to Solar Panel + Li-ion battery)

7.5 Does this device support GPS positioning?

Yes. This device supports GPS function and can report latitude and longitude coordinates in the uplink payload.

For configuration and usage details, please refer to: Add Location Data on Uplink Packet

8. Order Info

Part Number: CS01-FB/FS

XX:

• GE: General version ( Exclude SIM card)

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

Notice: CS01-FB/FS doesn't include current sensor. User need to purchase seperately.

Reference Model for current sensor:

• SCT013G-D-100: 100A/50mA
• SCT024-300: 300A/50mA
• SCT036-600: 600A/50mA

9. Packing Info

Package Includes:

• CS01-FB/FS NB-IoT 4 Channels Current Sensor Converter

Dimension and weight: Package Size / pcs :

• For CS01-FB: mm
• For CS01-FS: mm

Weight / pcs :

• For CS01-FB: g
• For CS01-FS: g

Transformer size and weight:

Package Size / pcs :

• For SCT013G-D-100: 100*80*30 mm
• For SCT024-300: 69*50*107 mm
• For SCT036-600: 74*74*100 mm

Weight / pcs :

• For SCT013G-D-100: 80g
• For SCT024-300: 209 g
• For SCT036-600: 330 g

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