Dragino LT22222-L User Manual

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LT Series LoRa IO controller User Manual 1 / 42
LT Series LoRa IO Controller User Manual
Document Version: 1.4.2
Image Version: v1.4
Version
Description
Date
1.0
Release
2018-Sep-26
1.0.2
Add 8 channels mode for US915, AU915, CN470
2018-Oct-24
1.0.3
Add current measure photo
2018-Nov-2
1.0.4
Add Cayenne connection guide
2018-Nov-24
1.1
Add downlink trouble shooting, Add Hardware Source code link.
Add change log for v1.1. (related to Downlink, Payload part)
Add TTN payload format
2019-Jan-24
1.1.1
Add more info for 8 channel mode descript and troubleshooting while use
US915 and AU915
2019-Feb-21
1.1.2
Modify trouble shooting for upload via FlashLoader,
2019-Apr-26

Dragino LT22222-L Specifications

General

Model	LT22222-L
Category	Controller
Communication Protocol	LoRaWAN
LoRa Module	SX1276
Relay Max Switching Voltage	250V AC / 30V DC
Relay Max Switching Current	5A
Frequency Band	EU868, US915, AS923, AU915, IN865, KR920
MCU	STM32
Input	Digital
Output	2 x Relay Output
LoRaWAN Band	EU868, US915, AS923, AU915, IN865, KR920
LoRaWAN Class	A

Summary

Powering On the Device

Operation Modes and Network Setup

Example: Joining a LoRaWAN Network

Uplink Payload Structure

Downlink Payload Control

Explanation of downlink control types, type codes, and payload examples for device commands.

Interface Details

Using AT Commands

Accessing AT Commands

How to connect via USB-TTL adapter and use serial tools to access AT commands.

Common AT Command Sequences

Step-by-step AT command examples for ABP mode with different gateways.

Multi-channel ABP Mode (SX1301/LG308)

AT commands for ABP mode when using multi-channel gateways.

Single-channel ABP Mode (LG01/LG02)

AT commands for ABP mode with single-channel gateways like LG01/LG02.

Changing to Class A Mode

Frequently Asked Questions (FAQ)

How to Upgrade Firmware

Changing LoRa Frequency Bands/Region

Configuring 8-Channel Mode (US915, AU915, CN470)

Using AT+CHE command to configure 8-channel operation for specific frequency bands.

Single Channel Gateway Setup (LG01/LG02)

Steps to set up the LT for ABP mode and single frequency transmission with LG01/LG02.

Troubleshooting Common Issues

Downlink Issues

Guidance on debugging and resolving problems with downlink functionality.

Firmware Upload Problems

TTN Join Issues (US915/AU915)

Explanation of why TTN join might fail in specific bands due to channel mapping.