Dragino RS485-LN, RS485 User Manual

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Version

Description

Date

1.0

Release

2019-Dec-8

1.0.1

Improve product photos and network structure

2019-Dec-30

RS485-LN -- RS485 to LoRaWAN Converter User Manual

Document Version: 1.0.1

Image Version: v1.0

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1. Introduction .............................................................................................................................. 4

1.1 What is RS485-LN RS485 to LoRaWAN Converter ...................................................................... 4

1.2 Specifications .............................................................................................................................. 5

1.3 Features ...................................................................................................................................... 5

1.4 Applications ................................................................................................................................ 6

1.5 Firmware Change log ................................................................................................................. 7

2. Power ON Device ...................................................................................................................... 7

3. Operation Mode ....................................................................................................................... 8

3.1 How it works? ............................................................................................................................. 8

3.2 Example to join LoRaWAN network ............................................................................................ 8

3.3 Configure Commands to read data .......................................................................................... 11

3.4 Uplink Payload .......................................................................................................................... 14

3.5 Downlink Payload (control RS485 device) ................................................................................ 14

3.6 Buttons ..................................................................................................................................... 17

4. Use AT Command .................................................................................................................... 18

4.1 Access AT Command ................................................................................................................. 18

4.2 Common AT Command Sequence ............................................................................................. 20

4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ...................................................... 20

4.2.2 Single-channel ABP mode (Use with LG01/LG02) ........................................................... 20

5. FAQ ......................................................................................................................................... 20

5.1 How to upgrade the image? ..................................................................................................... 20

5.2 How to change the LoRa Frequency Bands/Region? ................................................................ 23

5.3 How to set up RS485-LN to work in other 8 channel mode in US915, AU915, CN470 bands? . 24

5.4 How to set up RS485-LN to work with Single Channel Gateway such as LG01/LG02? ............. 25

6. Trouble Shooting ..................................................................................................................... 27

6.1 Downlink doesn’t work, how to solve it? .................................................................................. 27

6.2 Why I can’t join TTN in US915 /AU915 bands? ......................................................................... 27

7. Order Info ............................................................................................................................... 27

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8. Packing Info ............................................................................................................................ 27

9. Support ................................................................................................................................... 28

10. Reference ................................................................................................................................ 29

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1. Introduction

1.1 What is RS485-LN RS485 to LoRaWAN Converter

The Dragino RS485-LN is a RS485 to LoRaWAN Converter. It converts the RS485 signal into

LoRaWAN wireless signal which simplify the IoT installation and reduce the

installation/maintaining cost.

RS485-LN allows user to monitor / control RS485 devices and reach extremely long ranges. It

provides ultra-long range spread spectrum communication and high interference immunity whilst

minimizing current consumption. It targets professional wireless sensor network applications

such as irrigation systems, smart metering, smart cities, smartphone detection, building

automation, and so on.

For data uplink, RS485-LN sends user-defined commands to RS485 devices and gets the return

from the RS485 devices. RS485-LN will process these returns according to user-define rules to get

the final payload and upload to LoRaWAN server.

For data downlink, RS485-LN runs in LoRaWAN Class C. When there downlink commands from

LoRaWAN server, RS485-LN will forward the commands from LoRaWAN server to RS485 devices.

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1.2 Specifications

Hardware System:

 STM32L072CZT6 MCU
 SX1276/78 Wireless Chip
 Power Consumption (exclude RS485 device):

 Idle: 32mA@12v
 20dB Transmit: 65mA@12v

Interface for Model:

 RS485
 Power Input 7~ 24V DC.

LoRa Spec:

 Frequency Range:

 Band 1 (HF): 862 ~ 1020 Mhz

 Band 2 (LF): 410 ~ 528 Mhz
 168 dB maximum link budget.
 +20 dBm - 100 mW constant RF output vs.
 +14 dBm high efficiency PA.
 Programmable bit rate up to 300 kbps.
 High sensitivity: down to -148 dBm.
 Bullet-proof front end: IIP3 = -12.5 dBm.
 Excellent blocking immunity.
 Low RX current of 10.3 mA, 200 nA register retention.
 Fully integrated synthesizer with a resolution of 61 Hz.
 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
 Built-in bit synchronizer for clock recovery.
 Preamble detection.
 127 dB Dynamic Range RSSI.
 Automatic RF Sense and CAD with ultra-fast AFC.
 Packet engine up to 256 bytes with CRC.

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1.3 Features

 LoRaWAN Class A & Class C protocol (default Class C)
 Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865/RU864
 AT Commands to change parameters
 Remote configure parameters via LoRa Downlink
 Firmware upgradable via program port
 Support multiply RS485 devices by flexible rules
 Support Modbus protocol

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1.4 Applications

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

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1.5 Firmware Change log

RS485-LN Image files – Download link

Image v1.0

 Release

2. Power ON Device

The RS485-LN can be powered by 7 ~ 24V DC power source. Connection as below

 Power Source VIN to RS485-LN VIN+
 Power Source GND to RS485-LN VIN-

Once there is power, the RS485-LN will be on.

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3. Operation Mode

3.1 How it works?

The RS485-LN is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join

network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the

network server and power on the RS485-LN. It will auto join the network via OTAA.

In case user can’t set the OTAA keys in the network server and has to use the existing keys from

server. User can use AT Command to set the keys in the devices.

3.2 Example to join LoRaWAN network

Here shows an example for how to join the TTN Network. Below is the network structure, we use

our LG308 as LoRaWAN gateway here.

The RS485-LN in this example connected to two RS485 devices for demonstration, user can

connect to other RS485 devices via the same method. The connection is as below:

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The LG308 is already set to connect to TTN network . So what we need to now is only configure

the TTN:

Step 1: Create a device in TTN with the OTAA keys from RS485-LN.

Each RS485-LN is shipped with a sticker with unique device EUI:

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