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- Page 1 LTC2 LoRaWAN Temperature Transmitter User Manual Document Version: 1.1 Image Version: v1.0 Version Description Date Release 2021-May-17 Correct Index 2021-Jul-5 LTC2 LoRaWAN Temperature Transmitter 1 / 32...
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Page 2: Table Of Contents
How it works? ..........................8 Quick guide to connect to LoRaWAN server (OTAA) ..............8 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2......... 8 2.3.2 Step 2: Power on LTC2 ....................12 Uplink Payload .......................... 13 2.4.1... - Page 3 How to use AT Command to configure LTC2 ................28 How to connect a customized PT100 cable? ................29 What is the frequency range of LTC2 LoRa part? ..............31 How to change the LoRa Frequency Bands/Region? ..............31 Trouble Shooting ........................31 Order Info ..........................
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Page 4: Introduction
LTC2 is LoRaWAN v1.0.3 compatible. Each LTC2 is pre-load with a set of unique keys for LoRaWAN registration, register these keys to local LoRaWAN server and it will auto connect after power on. -
Page 5: Applications
1.4 Hardware Change log LTC2 v1.0: Release. 1.5 Pin Definitions and Switch 1.5.1 Jumper JP2 ( Power ON) Put a jumper on JP2 will power on the LTC2. 1.5.2 LED The LED will flash in below case. 1) Send an uplink packet... -
Page 6: Pt100 Interfaces
There are two independent channels to connect 2 x PT100 probes. Each channel has 3-wire connection for 3-wire PT100 probes. 1.5.4 Reset Button Press this button will reboot the LTC2 1.6 Probe Variant LTC2 provide default probe version. See below for the variant: Model Photo Description LTC2-SI Standard IP68 Probe Version ➢... - Page 7 LTC2-FT Flat Type Version ➢ LTC2 with 1 x Flat Type PT100 probe. ➢ Installation: Attached ➢ Cable Length : 2m ➢ PT100 Class : Class A ➢ Probe Dimension: 8*25mm ➢ Measure Range: -50 ~ 200 °C ➢...
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Page 8: How To Use Ltc2
2. How to use LTC2? 2.1 Connect to PT100 sensors LTC2 has different probe option provided for ordering, if user has LTC2 with probe, just skip this step. If user want to connect to a 3 party PT100 probe, please see... - Page 9 Below is TTN screen shot: ➢ Create Application first. ➢ Manually Add a LoRaWAN End Device device. Choose OTAA MAC v1.0.3 Input the OTAA keys for LTC2. LTC2 LoRaWAN Temperature Transmitter 9 / 32...
- Page 10 Each LTC2 is shipped with a sticker with the default device EUI as below: ➢ Input these keys to device portal. ➢ Choose the Frequency band for this end node. LTC2 LoRaWAN Temperature Transmitter 10 / 32...
- Page 11 ➢ Input APP Key in this page as well. Add payload formatter So TTNv3 knows how to parse the LTC2 upload value. The payload for TTN can be found at below link: https://www.dragino.com/downloads/downloads/LoRa_End_Node/LTC2/Decoder/ LTC2 LoRaWAN Temperature Transmitter 11 / 32...
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Page 12: Step 2: Power On Ltc2
LTC2 is power off when ship from factory. Put a Jumper on JP2 to power on the device. After power on, LTC2 will auto join to TTN network via the LoRaWAN coverage by DLOS8. After join success, LTC2 will start to update message to IoT server. -
Page 13: Uplink Payload
➢ Unix Time Request:1: Request server downlink Unix time, 0 : N/A. In this mode, LTC2 will set this bit to 1 every 10 day to request a time SYNC. (AT+SYNCMOD to set this) ➢... -
Page 14: Datalog Feature
System timestamp=0x6073E967= 1618209127(UTC) 2.5 Datalog Feature LTC2 will auto get the time from LoRaWAN server during Join, and each uplink will then include a timestamp. When user want to retrieve sensor value, user can send a poll command from the IoT platform to ask sensor to send value in the required time slot. -
Page 15: Set Device Time
Once LTC2 Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and server will reply with (DeviceTimeAns) to send the current time to LTC2. If LTC2 fails to get the time from server, LTC2 will use the internal time and wait for next time request (AT+SYNCTDC to set time request period, default is 10 days). -
Page 16: Poll Sensor Value
For example, downlink command 31 60A06E90 60A07CA0 0A Is to check 2021/5/16 01:00:00 to 2021/5/16 02:00:00’s data Uplink Internal =10s，means LTC2 will send one packet every 10s. range 5~255s. LTC2 LoRaWAN Temperature Transmitter 16 / 32... -
Page 17: Datalog Uplink Payload
2.5.4 Datalog Uplink payload When server senser a datalog polling to LTC2, LTC2 will reply with one or more uplink messages as reply. Each uplink message includes multiply data entries value. Each entry has the same payload format as normal uplink payload. -
Page 18: Alarm Mode
Channel1 temp=0x0B49/100=28.89℃ Channel2 temp=0x8001/100=-327.67℃ System timestamp=0x60A072B8= 1621127864(UTC) 2.6 Alarm Mode LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately. Detail commands see: Enable Alarm Mode. Config Alarm Sampling Time. -
Page 19: Configure Ltc2 Via At Command Or Lorawan Downlink
✓ General system settings like: uplink interval. ✓ LoRaWAN protocol & radio related command. They are same for all Dragino Device which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki: http://wiki.dragino.com/index.php?title=End_Device_Downlink_Command ➢ Commands special design for LTC2 These commands only valid for LTC2, as below: 3.1 Set Transmit Interval Time... -
Page 20: Set External Sensor Mode
AT+EXT=? Get current EXT settings AT+EXT=1 Set EXT to 0b(0001) AT+EXT=2 Set EXT to 0b(0010) AT+EXT=3 Set EXT to 0b(0011) Downlink Command: 0xA2 Total bytes: 2 bytes Example: 0xA201: same as AT+EXT=1 LTC2 LoRaWAN Temperature Transmitter 20 / 32... -
Page 21: Quit At Command
SYNCMOD is set to 1 by default. If user want to set a different time from LoRaWAN server, user need to set this to 0. AT Command: Command Example Function Enable Sync system time via LoRaWAN MAC Command AT+SYNCMOD=1 (DeviceTimeReq) Downlink Command: LTC2 LoRaWAN Temperature Transmitter 21 / 32... -
Page 22: Set Time Sync Interval
Feature: Enable Alarm Mode. AT Command: Total bytes: 2 Example: 0xA500:AT+WMOD=0(default) 0xA501:AT+WMOD=1(alarm mode) Downlink Command: See Poll Sensor Value. 3.10 Alarm check time Feature: The time interval to check sensor value for Alarm. AT Command: LTC2 LoRaWAN Temperature Transmitter 22 / 32... -
Page 23: Set Alarm Threshold
Feature: Set Calibrate value for PT100 cable. Detail of use of this command please see connect to a customized PT100 Probe. AT Command: Total bytes: 5 Example: AT+RCABLE=296,300 Channel 1 rcable=0x0128/1000=0.296R Channel 2 rcable=0x012C/1000=0.300R Downlink Command: → Same as AT+RCABLE=296,300 0xA80128012C LTC2 LoRaWAN Temperature Transmitter 23 / 32... -
Page 24: Poll Calibrate Value
3.13 Poll Calibrate Value Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server. AT Command: No AT Command. Downlink Command: Example:A901 End nodes will send racable config to server Like uplink payload: 010128012C 3.14... -
Page 25: Print Last Few Data Entries
Feature: Clear flash storage for data log feature. AT Command: AT+CLRDTA Command Example Function Response Clear all stored sensor data… AT+CLRDTA Clear date record Downlink Command: 0xA3 ➢ Example: 0xA301 //Same as AT+CLRDTA LTC2 LoRaWAN Temperature Transmitter 25 / 32... -
Page 26: Battery & How To Replace
And make sure the positive and negative pins match. 4.3 Power Consumption Analyze Dragino Battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval. -
Page 27: Firmware Change Log And Upload Firmware
And the Life expectation in difference case will be shown on the right. 5. Firmware Change Log and Upload Firmware User can use ST-Link v2 to upgrade firmware into LTC2 for bug fix or new features. The hardware connection for upgrade firmware is as below: Connection: ✓... -
Page 28: Faq
6. FAQ 6.1 How to use AT Command to configure LTC2 LTC2 supports AT Command set. User can use a USB to TTL adapter plus the Program Cable to connect to LTC2 for using AT command, as below. Connection: ✓... -
Page 29: How To Connect A Customized Pt100 Cable
6.2 How to connect a customized PT100 cable? The LTC2 has two channels means it can connect 2 x PT100 cables. Besides use the PT100 cables provided by Dragino, User can connect their PT100 probes. When connect to a user PT100 probe, we recommend that user do a calibration to eliminate the effect from the cables so to get the best accuracy. - Page 30 --> Calibrate Channel 1 with 0.296R Or use LoRaWAN downlink command (0xA8 Code) to set: 0xA801280000 User can use 0xA9 downlink command to poll the current calibration value. Step 4: Connect the PT100 to LTC2 LTC2 LoRaWAN Temperature Transmitter 30 / 32...
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Page 31: What Is The Frequency Range Of Ltc2 Lora Part
(white wire ) connect to the left pin of Channel -1. 6.3 What is the frequency range of LTC2 LoRa part? Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:... -
Page 32: Packing Info
US915: LoRaWAN US915 band ✓ IN865: LoRaWAN IN865 band ✓ CN470: LoRaWAN CN470 band 9. Packing Info Package Includes: ✓ LTC2 LoRaWAN Temperature Transmitter x 1 Dimension and weight: ✓ Device Size: ✓ Device Weight: ✓ Package Size: ✓ Packege Weight: 10. Support ➢...
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