Changes for page RS485-LN – RS485 to LoRaWAN Converter User Manual

Last modified by Karry Zhuang on 2025/03/06 16:34

From version < 17.2 >

edited by Xiaoling
on 2022/05/19 18:05

To version < 15.4 >

edited by Xiaoling
on 2022/05/19 17:48

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@@ -219,185 +219,142 @@
  [[image:1652953568895-172.png||height="232" width="724"]]
--== 3.3 Configure Commands to read data ==
--(((
++
++
++1.
++11. Configure Commands to read data
++
  There are plenty of RS485 and TTL level devices in the market and each device has different command to read the valid data. To support these devices in flexible, RS485-BL supports flexible command set. User can use [[AT Commands or LoRaWAN Downlink>>path:#AT_COMMAND]] Command to configure how RS485-BL should read the sensor and how to handle the return from RS485 or TTL sensors.
--)))
--=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
++1.
++11.
++111. Configure UART settings for RS485 or TTL communication
++
  RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
--**~1. RS485-MODBUS mode:**
++1. RS485-MODBUS mode:
  AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
--**2. TTL mode:**
++1. TTL mode:
++
  AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
++
  RS485-BL default UART settings is **9600, no parity, stop bit 1**. If the sensor has a different settings, user can change the RS485-BL setting to match.
--(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
--|(((
--**AT Commands**
--)))|(% style="width:285px" %)(((
--**Description**
--)))|(% style="width:347px" %)(((
--**Example**
--)))
--|(((
--AT+BAUDR
--)))|(% style="width:285px" %)(((
--Set the baud rate (for RS485 connection). Default Value is: 9600.
--)))|(% style="width:347px" %)(((
--(((
++
++|**AT Commands**|**Description**|**Example**
++|AT+BAUDR|Set the baud rate (for RS485 connection). Default Value is: 9600.|(((
  AT+BAUDR=9600
--)))
--(((
  Options: (1200,2400,4800,14400,19200,115200)
  )))
--)))
--|(((
--AT+PARITY
--)))|(% style="width:285px" %)(((
--(((
++|AT+PARITY|(((
  Set UART parity (for RS485 connection)
--)))
--(((
  Default Value is: no parity.
--)))
--)))|(% style="width:347px" %)(((
--(((
++)))|(((
  AT+PARITY=0
--)))
--(((
  Option: 0: no parity, 1: odd parity, 2: even parity
  )))
--)))
--|(((
--AT+STOPBIT
--)))|(% style="width:285px" %)(((
--(((
++|AT+STOPBIT|(((
  Set serial stopbit (for RS485 connection)
--)))
--(((
  Default Value is: 1bit.
--)))
--)))|(% style="width:347px" %)(((
--(((
++)))|(((
  AT+STOPBIT=0 for 1bit
--)))
--(((
  AT+STOPBIT=1 for 1.5 bit
--)))
--(((
  AT+STOPBIT=2 for 2 bits
  )))
--)))
--=== 3.3.2 Configure sensors ===
--(((
--Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands (% style="color:#4f81bd" %)**AT+CFGDEV**.
--)))
--(((
--When user issue an (% style="color:#4f81bd" %)**AT+CFGDEV**(%%) command, Each (% style="color:#4f81bd" %)**AT+CFGDEV**(%%) equals to send a command to the RS485 or TTL sensors. This command will only run when user input it and won’t run during each sampling.
--)))
--(% border="1" style="background-color:#ffffcc; color:green; width:806px" %)
--|**AT Commands**|(% style="width:418px" %)**Description**|(% style="width:256px" %)**Example**
--|AT+CFGDEV|(% style="width:418px" %)(((
++1.
++11.
++111. Configure sensors
++
++Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands AT+CFGDEV.
++
++
++When user issue an AT+CFGDEV command, Each AT+CFGDEV equals to send a command to the RS485 or TTL sensors. This command will only run when user input it and won’t run during each sampling.
++
++|**AT Commands**|**Description**|**Example**
++|AT+CFGDEV|(((
  This command is used to configure the RS485/TTL devices; they won’t be used during sampling.
--AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,
++AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
--mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
--)))|(% style="width:256px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
++m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
++)))|AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
  Detail of AT+CFGDEV command see [[AT+CFGDEV detail>>path:#AT_CFGDEV]].
--=== 3.3.3 Configure read commands for each sampling ===
--(((
++
++
++
++1.
++11.
++111. Configure read commands for each sampling
++
  RS485-BL is a battery powered device; it will sleep most of time. And wake up on each period and read RS485 / TTL sensor data and uplink.
--)))
--(((
++
  During each sampling, we need to confirm what commands we need to send to the sensors to read data. After the RS485/TTL sensors send back the value, it normally includes some bytes and we only need a few from them for a shorten payload.
--)))
--(((
++
  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
--)))
--(((
++
  This section describes how to achieve above goals.
--)))
--(((
++
  During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
--)))
--(((
++
  **Command from RS485-BL to Sensor:**
--)))
--(((
  RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
--)))
--(((
++
  **Handle return from sensors to RS485-BL**:
--)))
--(((
  After RS485-BL send out a string to sensor, RS485-BL will wait for the return from RS485 or TTL sensor. And user can specify how to handle the return, by **AT+DATACUT or AT+SEARCH commands**
--)))
--* (((
--**AT+DATACUT**
--)))
--(((
++* **AT+DATACUT**
++
  When the return value from sensor have fix length and we know which position the valid value we should get, we can use AT+DATACUT command.
--)))
--* (((
--**AT+SEARCH**
--)))
--(((
++* **AT+SEARCH**
++
  When the return value from sensor is dynamic length and we are not sure which bytes the valid data is, instead, we know what value the valid value following. We can use AT+SEARCH to search the valid value in the return string.
--)))
--(((
++
  **Define wait timeout:**
--)))
--(((
  Some RS485 device might has longer delay on reply, so user can use AT+CMDDL to set the timeout for getting reply after the RS485 command is sent. For example, AT+CMDDL1=1000 to send the open time to 1000ms
--)))
--(((
++
  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
--)))
++
  **Examples:**
  Below are examples for the how above AT Commands works.
++
  **AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
--(% border="1" class="table-bordered" %)
  |(((
  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
@@ -410,9 +410,9 @@
  In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
++
  **AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
--(% border="1" class="table-bordered" %)
  |(((
  **AT+SEARCHx=aa,xx xx xx xx xx**
@@ -430,7 +430,7 @@
  The valid data will be all bytes after 1E 56 34 , so it is 2e 30 58 5f 36 41 30 31 00 49
--[[image:1652954654347-831.png]]
++[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image013.png]]
 . For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49

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