CPL03-FB/FS NB-IoT/LTE-M Pulse Contact Sensor

1. Introduction

1.1 What is CPL03-FB/FS NB-IoT/LTE-M Pulse/Contact Sensor

The Dragino CPL03-FB/FS is a NB-IoT/LTE-M Contact Sensor for Internet of Things solution. It detects dry contact status, open time, open counts, and then upload to IoT server via NB-IoT or CAT-M1 network.

The CPL03-FB/FS will send periodically data every day as well as for each dry contact action. It also counts the contact open times and calculate last open duration. User can also disable the uplink for each open/ close event, instead, device can count each open event and uplink periodically.

CPL03-FB/FS supports open alarm feature, user can set open alarm for instant notice.

CPL03-FB/FS is designed for outdoor use. It has a weatherproof enclosure and industrial level battery to work in low to high temperatures.

CPL03-FB/FS supports different uplink methods including MQTT, MQTTs, UDP or TCP for different application requirement, and support uplinks to various IoT Servers.

CPL03-FB/FS supports BLE configure and OTA update which make user easy to use.

CPL03-FB/FS is powered by 8500mAh Li-SOCI2 battery or solar powered + Li-ion battery, it is designed for long-term use up to several years.

CPL03-FB/FS has optional built-in SIM card and default IoT server connection version. Which makes it works with simple configuration.

1.2 Features

• For -NB Bands: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B28/B66/B71/B85
• CAT-M1 / LTE-M Bands: B1/B2/B3/B4/B5/B8/B12/B13/B18/B19/B20/B25/B26/B27/B28/B66/B85
• Upload water flow volume
• Open/Close detect
• Open/Close statistics
• Open Alarm Feature
• IP protection level: IP67
• Multiply Sampling and one uplink
• Uplink via MQTT, MQTTs, TCP or UDP
• Support Bluetooth v5.1 remote configure and update firmware
• Uplink on periodically
• Downlink to change configure
• 8500mAh Li/SOCl2 Battery (CPL03-FB)
• Solar panel + 3000mAh Li-ion battery (CPL03-FS)
• Nano SIM card slot for NB-IoT SIM

1.3 Specification

Common DC Characteristics:

• Supply Voltage: 3.0v ~ 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
• B26 @H-FDD: 876MHz
• B28 @H-FDD: 750MHz
• B65 @H-FDD: 2155MHz
• B66 @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

1.3 Applications

• Open/Close Detection
• Pulse meter application
• Dry Contact Detection

1.4 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.

1.5 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 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.

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.

1.6 BLE connection

CPL03-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.

1.7 Pin Definitions , Switch & SIM Direction

1.7.1 Jumper JP2

Power on Device when put this jumper.

1.7.2 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

1.7.3 Reset Button

Press to reboot the device.

1.7.4 SIM Card Direction

See this link. How to insert SIM Card.

1.8 Mechanical

1.8.1 For FB version

1.8.2 For FS version

2. Use CPL03-FB/FS to communicate with IoT Server

2.1 Send data to IoT server via NB-IoT network

The CPL03-FB/FS is equipped with a NB-IoT module, the pre-loaded firmware in CPL03-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 CPL03-FB/FS.

Below shows the network structure:

There are two version: -GE and -1T version of CPL03-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 CPL03-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 ThingsEye and Activate CPL03-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, CPL03-FB/FS supports different payload type.

Includes:

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 General Json Format(Type=0)

2.3.1 AT+CFGMOD=1(Real-Time Open/Close Status)

{"IMEI":"355025936334919","IMSI":"901405125152948","Model":"CPL03-FB","fcnt":"2","work_mode":1,"signal":"29","bat":3.48,"count_mode":0,"tdc_send_flag":1,"trigger_mode":0,"alarm":0,"pa8_level_status":1,"count":0,"door_duration":0,"time":"2026-10-13T08:49:34Z","latitude":0.000000,"longitude":0.000000,"gps_time":"00/00/00,00:00:00","1":["0,0,1,0,0,0,2026-10-13T08:43:33Z"],"2":["0,0,1,0,0,0,2026-10-13T08:44:33Z"],"3":["0,0,1,0,0,0,2026-10-13T08:45:33Z"],"4":["0,0,1,0,0,0,2026-10-13T08:46:33Z"],"5":["0,0,1,0,0,0,2026-10-13T08:47:33Z"],"6":["0,0,1,0,0,0,2026-10-13T08:48:33Z"],"7":["0,0,1,0,0,0,2026-10-13T08:49:33Z"],"8":["0,0,1,0,0,0,2026-10-13T08:49:34Z"]}

Notice, from above payload

• work mode, count_mode, tdc_send flag, trigger mode, alarm, pa8 level status, count time, door duration, 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): count_mode, tdc_send flag, trigger mode, alarm, pa8 level status, count time, door durationv & Sampling time.

• Count mod: Default=0

0: Uplink total open door times since factory

1 : Uplink total open door times since last uplink.

• TDC send flag

When the flag is 1, it means sending packets at normal time intervals.

Otherwise, it is a packet sent at non-TDC time.

• Work mod

0: CPL03-FB-Real-Time Open/Close Status mode.

1: CPL03-FB-3 pulse mode.

• Trigger mod

0: The pulse count will increment by one after a close to open event and the last duration is for the open event.

1: The pulse count will increment by one after a open to close event and the last duration is for the close event.

Alarm

See Alarm Base on Timeout

• pa8 level status

0: The PA8 pin level is low.

1: The PA8 pin level is high.

count

Total pulse/counting base on dry contact trigger event

Range (3 Bytes) : 0x000000 ~ 0xFFFFFF . Max: 16777215

Door duration

1) AT+TTRMOD1=0: Dry Contact last open duration.(Unit: sec)

2) AT+TTRMOD1=1: Dry Contact last close duration.(Unit: sec)

Time & GPS Time

Time Example: 2026-10-14T01:24:25Z

Latitude:

Example: 22.706150

Longitude:

Example: 114.242830

2.3.2 AT+CFGMOD=2(3 pulse mode)

{"IMEI":"355025936334919","IMSI":"901405125152948","Model":"CPL03-FB","fcnt":"1","work_mode":2,"signal":"29","bat":3.48,"calc_flag":0,"count_mode":0,"tdc_send_flag":0,"count1":0,"count2":0,"count3":0,"time":"2026-10-14T02:55:32Z","latitude":0.000000,"longitude":0.000000,"gps_time":"00/00/00,00:00:00","1":["0,0,0,0,0,2026-10-14T02:48:36Z"],"2":["0,0,0,0,0,2026-10-14T02:49:36Z"],"3":["0,0,0,0,0,2026-10-14T02:50:36Z"],"4":["0,0,0,0,0,2026-10-14T02:51:36Z"],"5":["0,0,0,0,0,2026-10-14T02:52:36Z"],"6":["0,0,0,0,0,2026-10-14T02:53:36Z"],"7":["0,0,0,0,0,2026-10-14T02:54:36Z"],"8":["0,0,0,0,0,2026-10-14T02:55:32Z"]}

Notice, from above payload

• work mode, calc flag, count_mode, tdc send flag, count time1, count time2, count time3, 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): calc flag, count_mode, count time1, count time2, count time3, Sampling time.

Max COUNT for each port is 16777215. Exceed this number will reset to 1.

Count mod: Default=0

0: Uplink total count times since factory

1: Uplink total count times since last FPORT=2 uplink.

• TDC send flag

When the flag is 1, it means sending packets at normal time intervals.

Otherwise, it is a packet sent at non-TDC time.

• Work mod

0: Real-Time Open/Close Status mode.

1: 3 x pulse counting mode.

• Calculate Flag

The calculate flag is a user define field, IoT server can use this filed to handle different meter with different pulse factor. For example, if there are 100 water meters, meter 1 ~50 are 1 liter/pulse and meter 51 ~ 100 has 1.5 liter/pulse.

User can set calculate flag to 1 for meter 1~50 and 2 for meter 51 ~ 100, So IoT Server can use this field for calculation.

Default value: 0.

Range: 0 ~ 7

Refer: Set Calculate Flag

• COUNT1(PA8 of pin)

Range Max: 16777215.Exceed this number will reset to 1.

• COUNT2(PA4 of pin)

Range Max: 16777215.Exceed this number will reset to 1.

• COUNT3(PB15 of pin)

Range Max: 16777215.Exceed this number will reset to 1.

3. Configure CPL03-FB/FS

3.1 Configure Methods

CPL03-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), -FB/FS 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+? : Help on

AT+ : Run

AT+= : Set the value

AT+=? : Get the value

General Commands

AT+MODEL : Get module information

AT+CFGMOD : Working mode selection

AT+DEUI : Get or set the Device ID

AT+CFG : Print all settings

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+5VT : Get or Set extend the time of 5V power

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

AT+RXDL : Get or Set the receiving time

AT+EXT : Get or Set Count value

AT+TTRIG : Get or Set Alarm Base on Timeout

AT+TTRALARM : Get or Set TTRIG of Alarm interval (unit: minute)

AT+DISALARM : Enable/Disable Alarm for open/close

AT+TTRMOD1 : Get or Set the trigger interrupt mode(PA8)(0:falling,1:rising)

AT+TTRMOD2 : Get or Set the trigger interrupt mode(PA4)(0:falling,1:rising)

AT+TTRMOD3 : Get or Set the trigger interrupt mode(PB15)(0:falling,1:rising)

AT+COUNTMOD : Get or Set the count mode of CPL03-FB

AT+CALCFLAG : Get or Set the calculate flag

AT+CLRC : Clear current door open count

AT+GETSENSORVALUE : Returns the current sensor measurement

AT+SLEEP : Get or Set the sleep mode

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

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

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

Information

AT+FDR : Reset Parameters to Factory Default

AT+PWORD : Get or set the System password

AT+LDATA : Get the last upload data

AT+PDTA: Print the sector data from start page to stop page

AT+PLDTA: Print the last few sets of data

AT+CLRDTA: Clear the storage, record position back to 1st

AT+GETLOG : Print serial port logs

ATZ : Trig a reset of the MCU

AT+UDPMOD: Get or set UDP working mode

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

AT+QCOPS: Get or set operator code

AT+DEBUG: Get or Set the debug mode

AT+UPGRADE : OTA upgrade.

3.4 Mode switching

3.4.1 Real-Time Open/Close Status

Default working mode

AT Command: AT+CFGMOD=1

Downlink Command: 0x02 01

The wiring of the Real-Time Open/Close Status mode is as follows：

3.4.1.1 Set Alarm Base on Timeout

It only takes effect when AT+CFGMOD=1.

CPL03-FB/FS can monitor the timeout for a status change, this feature can be used to monitor some events such as door opening too long etc. Related Parameters are:

1. Keep Status: Status to be monitor

Keep Status = 1: Monitor Close to Open event

Keep Status = 0: Monitor Open to Close event

2. Keep Time: Timeout to send an Alarm

Range 0 ~ 65535 seconds.

If keep time = 0, Disable Alarm Base on Timeout feature.

If keep time > 0, device will monitor the keep status event and send an alarm when status doesn’t change after timeout.

• AT Command: AT+TTRIG

AT+TTRIG=1,30 --> When the Keep Status change from connect to disconnect, and device remains in disconnect status for more than 30 seconds. CPL03-FB/FS will send an uplink packet, the Alarm bit (the second bit of 1^st byte of payload) on this uplink packet is set to 1.

AT+TTRIG=0,0 --> Default Value, disable timeout Alarm.

• Downlink Command: 0x0F

Format: Command Code (0x0F) followed by 8 bytes, each parameter after 0F takes 4 bytes.

Example: Downlink payload: 0x0F 00 00 00 01 00 00 00 1E // AT+TTRIG=1,30 30(D)=0x1E(H)

3.4.1.2 TTRIG timeout status alarm

Feature: Set TTRIG of Alarm interval. (unit: minute)

It only takes effect when AT+CFGMOD=1. It needs to be used with AT+TTRIG . When TTRIG times out and causes an alarm, and the status does not change subsequently, an alarm packet will be sent at the alarm interval.

AT Command: AT+TTRALARM

Example:

• AT+TTRALARM=0 // disable continuous alarm
• AT+TTRALARM=60 // Set the alarm interval to 60 minutes (unit: minutes)

Downlink Command: 0x0A

Example:

• Downlink payload: 0x0A 00 // AT+TTRALARM=0
• Downlink payload: 0x0A 3C // AT+TTRALARM=60, 60(D)=0x3C(H)

3.4.1.3 Clear current door open count

Feature: Manually Clear current door open count

AT Command: AT+CLRC // Clear current open count and the duration of the last open

Downlink Command: 0xA1 00 // AT+CLRC

3.4.1.4 Enable / Disable Alarm

Feature: Enable/Disable Alarm for open/close event. Default value 0.

AT Command: AT+DISALARM

Command Example	Function	Response
AT+DISALARM=1	End node will only send packets in TDC time.	OK
AT+DISALARM=0	End node will send packets in TDC time or status change for door sensor	OK

Downlink Command: 0x0B

Example: Downlink payload: 0x0B 00// AT+DISALARM=0

3.4.2 pulse mode

To use this working mode, you need to set AT+CFGMOD=2.

AT Command: AT+CFGMOD=2

Downlink Command: 0x02 02

The wiring of the three pulse counting mode are as follows：

For AT+CFGMOD=2:

3.4.2.1 Port1,Port2,Port3 count mode

• Port1: Get or Set the trigger interrupt mode(PA8)

AT Command: AT+TTRMOD1 0: Signal falling edge(Default), 1: Signal raising edge

         Ex1: AT+TTRMOD1=0   // Count and trigger from close to open (falling edge), default.

         Ex2: AT+TTRMOD1=1   // Count and trigger from open to close (rising edge).

Downlink Command: 0x0C

         Example: 0x0C00     // AT+TTRMOD1=0

• Port2: Get or Set the trigger interrupt mode(PA4)

AT Command: AT+TTRMOD2 0: Signal falling edge(Default), 1: Signal raising edge

         Ex1: AT+TTRMOD2=0   // Count and trigger from close to open (falling edge), default.

         Ex2: AT+TTRMOD2=1   // Count and trigger from open to close (rising edge).

Downlink Command: 0x0D

         Example: 0x0D01     // AT+TTRMOD2=1

• Port3: Get or Set the trigger interrupt mode(PB15)

AT Command: AT+TTRMOD3 0: Signal falling edge(Default), 1: Signal raising edge

         Ex1: AT+TTRMOD3=0   // Count and trigger from close to open (falling edge), default.

         Ex2: AT+TTRMOD3=1   // Count and trigger from open to close (rising edge).

Downlink Command: 0x0E

         Example: 0x0E00     // AT+TTRMOD3=0

3.4.2.2 Set the calculate flag

Feature: Set the calculate flag (Range is 0 to 7), It only takes effect when AT+CFGMOD=2.

AT Command:AT+CALCFLAG=aa ( Default : 0 )

         Example: AT+CALCFLAG=2

Downlink Command: 0xA3

         Example: 0xA3 02     // AT+CALCFLAG=2

3.4.2.3 Set Count value

Feature: Manually set the count number

In Real-Time Open/Close Status mode work mode, the Total_pulse set by the "AT+SETCNT=1,xx" command.

In 3 x pulse counting mode work mode, the Port1_Total_pulse(PA8) set by the "AT+SETCNT=1,xx" command.

AT Command: AT+SETCNT

        AT+SETCNT=1,aa

        AT+SETCNT=2,aa

        AT+SETCNT=3,aa

Downlink Command:

• 0x21 xx xx xx xx

• 0x22 xx xx xx xx

• 0x23 xx xx xx xx

There is a downlink instruction to clear the count: 0xA1 00, when the user downlinks 0xA1 00, the count of Port1, Port2 and Port3 clears to 0.

3.5 Count Mod

Feature: Manually set the count mode.

AT Command: AT+COUNTMOD

• 0: Accumulative (Default),

• 1: Reset after uplink.

Example: AT+COUNTMOD=0

Downlink Command: 0xA2

Example: 0xA2 00 // AT+COUNTMOD=0

3.6 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 Command: 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.

3.7 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 Command: 0x03

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

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

3.8 Reset

Feature: Trig a reset of the MCU.

AT Command: ATZ

Downlink Command: 0x04FF

3.9 +5V

Feature: Set extend the time of 5V power.

AT Command: AT+5VT

Example: AT+5VT=2000 // Set extend the time of 5V power to 2000 ms

Downlink Command: 0x05

Format: Command Code (0x05) followed by 3 bytes.

Example: Downlink Payload: 05 00 07 D0// AT+5VT=2000

3.10 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: 0x07 00 // AT+MQOS=0

Ex2: Downlink payload: 0x07 01 // AT+MQOS=1

3.11 Clock logging

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 8 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: 0x08

Format: Command Code (0x08) followed by 5 bytes.

• Example 1: Downlink Payload: 08 01 FFFF 0F 08 // Set SHT record time: AT+CLOCKLOG=1,65535,15,8

• Example 2: Downlink Payload: 08 01 04B0 0F 08 // Set SHT record time: AT+CLOCKLOG=1,1200,15,8

Note

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

3.12 Set the TLS mode

Refer to this link (MQTT Connection to send data to Tago.io)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

3.13 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+GNSST=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+GPS=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+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

3.17 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.

3.18 Factory data reset

Two different restore factory Settings configurations.

AT command:

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

3.19 Uplink log query

• AT command: AT+GETLOG

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

3.20 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	AT+PLDTA=5 0001 2026/10/14 08:22:07 3484 status_data=8 count1=0 count2=0 count3=0 0002 2026/10/14 08:23:07 3484 status_data=8 count1=0 count2=0 count3=0 0003 2026/10/14 08:24:07 3484 status_data=8 count1=0 count2=0 count3=0 0004 2026/10/14 08:25:07 3492 status_data=8 count1=0 count2=0 count3=0 0005 2026/10/14 08:26:07 3488 status_data=8 count1=0 count2=0 count3=0 OK

Downlink Command:

No downlink commands for feature

3.21 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

E8000 2026/10/14 02:46:36 3488 status_data=8 count1=0 count2=0 count3=0 E8010 2026/10/14 02:47:36 3484 status_data=8 count1=0 count2=0 count3=0 E8020 2026/10/14 02:48:36 3492 status_data=8 count1=0 count2=0 count3=0 E8030 2026/10/14 02:49:36 3484 status_data=8 count1=0 count2=0 count3=0 E8040 2026/10/14 02:50:36 3488 status_data=8 count1=0 count2=0 count3=0 E8050 2026/10/14 02:51:36 3484 status_data=8 count1=0 count2=0 count3=0 E8060 2026/10/14 02:52:36 3484 status_data=8 count1=0 count2=0 count3=0 E8070 2026/10/14 02:53:36 3488 status_data=8 count1=0 count2=0 count3=0 OK

Downlink Command:

No downlink commands for feature

3.22 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. Battery & Power Consumption

CPL03-FB 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

5.1 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., CPL03-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=http://repo.dragino.com/release/NB/CPL03-FB.bin

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

5.2 Firmware Update through UART TTL interface

• Firmware and changelog can be downloaded from : Firmware download link

• For detailed instructions on how to perform an update via USB TTL, please refer to this link: UART Upgrade for -FB/-FS/-FE models

6. FAQ

6.1 How can I access the BG95-NGFF AT Commands?

User can access to BG95-NGFF directly and send AT Commands.

See BG95-NGFF AT Command set

6.2 How to Connect Dry contacts or Wet Contacts

CPL03-FB/FS can only be connected to dry contacts by default, and the wiring method is to connect the two ports of dry contacts to the VDD pin and pulse input pin of CPL03-FB/FS respectively.

If you want to connect a wet contact, you need to change the original wiring method. The wiring method is that the GND of the wet contact is connected to the GND of CPL03-FB/FS, and the pulse output is connected to the pulse pin, but the pulse output voltage of the wet contact must be less than 3.6V.

6.3 What is the maximum total number of pulses for CPL03? What happens after the maximum total number of pulses is reached?

The maximum total number of pulses for CPL03 is 16777215.

The count is reset when the maximum total number of pulses is reached.

6.4 General Manual for -FB , -FS models

Users can follow the instructions in this link to see how to configure to connect to different servers.

6.5 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)

6.6 Why does the CPL03-FB have 6 wires externally but only 4 inside the terminal block?

The CPL03-FB is designed to support three dry contact inputs. Each dry contact requires two connections: one to a pulse input pin and one to VDD.

At the field sensor side, all six wires are available:

• Pulse Input 1: White wire → PA8 & Black → VDD
• Pulse Input 2: Red wire → PA4 & Yellow → VDD
• Pulse Input 3: Green wire → PB15 & Orange → VDD

At the device side, only four wires are terminated:

To simplify field wiring and avoid connecting multiple wires to the same VDD terminal (which can be difficult due to the small screw terminal size), the yellow and orange wires are internally connected (soldered) to the black wire at the device end. This means only one wire (Black) needs to be connected to the VDD, while the other end of the cable still provides six individual wires for easy connection to three dry contacts.

This design improves terminal block connection reliability and simplifies installation.

6.7 CPL03 detects the NPN circuit and outputs the count value

In this example, **PA8 **is used as the pulse input pin

connection diagram

When PA8 detects a pulse, the count value will increase

6.8 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

7. Order Info

Part Number: CPL03-FB-XX

XX:

• GE: General version ( Exclude SIM card)

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

8. Packing Info

Package Includes:

• CPL03-FB NB-IoT/LTE-M Pulse/Contact sensor x 1

• External antenna x 1

Dimension and weight:

• Device Size: cm

• Device Weight: g

• Package Size / pcs : cm

• Weight / pcs : g

9. 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.