Last modified by Karry Zhuang on 2025/03/06 16:34
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From version < 15.1 >
edited by Xiaoling
on 2022/05/19 17:46
To version < 18.1 >
edited by Xiaoling
on 2022/05/23 08:48
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Title
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1 -RS485-BL – Waterproof RS485 to LoRaWAN Converter
1 +RS485-LN – RS485 to LoRaWAN Converter
Content
... ... @@ -167,203 +167,237 @@
167 167  
168 168  [[image:1652953414711-647.png||height="337" width="723"]]
169 169  
170 -
170 +(((
171 171  The RS485-BL in this example connected to two RS485 devices for demonstration, user can connect to other RS485 devices via the same method.
172 +)))
172 172  
173 -
174 +(((
174 174  The LG308 is already set to connect to [[TTN V3 network >>url:https://www.thethingsnetwork.org/]]. So what we need to now is only configure the TTN V3:
176 +)))
175 175  
178 +(((
176 176  **Step 1**: Create a device in TTN V3 with the OTAA keys from RS485-BL.
180 +)))
177 177  
182 +(((
178 178  Each RS485-BL is shipped with a sticker with unique device EUI:
184 +)))
179 179  
180 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image005.png]]
186 +[[image:1652953462722-299.png]]
181 181  
182 -
183 -
184 -
188 +(((
185 185  User can enter this key in their LoRaWAN Server portal. Below is TTN V3 screen shot:
190 +)))
186 186  
192 +(((
187 187  Add APP EUI in the application.
194 +)))
188 188  
189 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image006.png]]
190 190  
191 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image007.png]]
192 192  
193 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image008.png]]
194 194  
195 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image009.png]]
199 +[[image:image-20220519174512-1.png]]
196 196  
201 +[[image:image-20220519174512-2.png||height="328" width="731"]]
197 197  
203 +[[image:image-20220519174512-3.png||height="556" width="724"]]
198 198  
205 +[[image:image-20220519174512-4.png]]
199 199  
200 -
201 -
202 -
203 -
204 -
205 -
206 -
207 -
208 -
209 -
210 -
211 -
212 -
213 213  You can also choose to create the device manually.
214 214  
215 -|(((
216 -
217 -)))
209 +[[image:1652953542269-423.png||height="710" width="723"]]
218 218  
219 -
220 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image010.png]]
221 -
222 222  Add APP KEY and DEV EUI
223 223  
224 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image011.png]]
213 +[[image:1652953553383-907.png||height="514" width="724"]]
225 225  
226 226  
216 +(((
227 227  **Step 2**: Power on RS485-BL and it will auto join to the TTN V3 network. After join success, it will start to upload message to TTN V3 and user can see in the panel.
218 +)))
228 228  
229 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image012.png]]
220 +[[image:1652953568895-172.png||height="232" width="724"]]
230 230  
222 +== 3.3 Configure Commands to read data ==
231 231  
232 -
233 -
234 -1.
235 -11. Configure Commands to read data
236 -
224 +(((
237 237  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.
226 +)))
238 238  
228 +=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
239 239  
240 -1.
241 -11.
242 -111. Configure UART settings for RS485 or TTL communication
243 -
244 244  RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
245 245  
246 -1. RS485-MODBUS mode:
232 +**~1. RS485-MODBUS mode:**
247 247  
248 248  AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
249 249  
236 +**2. TTL mode:**
250 250  
251 -1. TTL mode:
252 -
253 253  AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
254 254  
255 -
256 256  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.
257 257  
258 -
259 -|**AT Commands**|**Description**|**Example**
260 -|AT+BAUDR|Set the baud rate (for RS485 connection). Default Value is: 9600.|(((
242 +(% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
243 +|(((
244 +**AT Commands**
245 +)))|(% style="width:285px" %)(((
246 +**Description**
247 +)))|(% style="width:347px" %)(((
248 +**Example**
249 +)))
250 +|(((
251 +AT+BAUDR
252 +)))|(% style="width:285px" %)(((
253 +Set the baud rate (for RS485 connection). Default Value is: 9600.
254 +)))|(% style="width:347px" %)(((
255 +(((
261 261  AT+BAUDR=9600
257 +)))
262 262  
259 +(((
263 263  Options: (1200,2400,4800,14400,19200,115200)
264 264  )))
265 -|AT+PARITY|(((
262 +)))
263 +|(((
264 +AT+PARITY
265 +)))|(% style="width:285px" %)(((
266 +(((
266 266  Set UART parity (for RS485 connection)
268 +)))
267 267  
270 +(((
268 268  Default Value is: no parity.
269 -)))|(((
272 +)))
273 +)))|(% style="width:347px" %)(((
274 +(((
270 270  AT+PARITY=0
276 +)))
271 271  
278 +(((
272 272  Option: 0: no parity, 1: odd parity, 2: even parity
273 273  )))
274 -|AT+STOPBIT|(((
281 +)))
282 +|(((
283 +AT+STOPBIT
284 +)))|(% style="width:285px" %)(((
285 +(((
275 275  Set serial stopbit (for RS485 connection)
287 +)))
276 276  
289 +(((
277 277  Default Value is: 1bit.
278 -)))|(((
291 +)))
292 +)))|(% style="width:347px" %)(((
293 +(((
279 279  AT+STOPBIT=0 for 1bit
295 +)))
280 280  
297 +(((
281 281  AT+STOPBIT=1 for 1.5 bit
299 +)))
282 282  
301 +(((
283 283  AT+STOPBIT=2 for 2 bits
284 284  )))
304 +)))
285 285  
306 +=== 3.3.2 Configure sensors ===
286 286  
308 +(((
309 +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**.
310 +)))
287 287  
312 +(((
313 +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.
314 +)))
288 288  
289 -1.
290 -11.
291 -111. Configure sensors
292 -
293 -Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands AT+CFGDEV.
294 -
295 -
296 -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.
297 -
298 -|**AT Commands**|**Description**|**Example**
299 -|AT+CFGDEV|(((
316 +(% border="1" style="background-color:#ffffcc; color:green; width:806px" %)
317 +|**AT Commands**|(% style="width:418px" %)**Description**|(% style="width:256px" %)**Example**
318 +|AT+CFGDEV|(% style="width:418px" %)(((
300 300  This command is used to configure the RS485/TTL devices; they won’t be used during sampling.
301 301  
302 -AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
321 +AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,
303 303  
304 -m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
305 -)))|AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
323 +mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
324 +)))|(% style="width:256px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
306 306  
307 307  Detail of AT+CFGDEV command see [[AT+CFGDEV detail>>path:#AT_CFGDEV]].
308 308  
328 +=== 3.3.3 Configure read commands for each sampling ===
309 309  
310 -
311 -
312 -
313 -1.
314 -11.
315 -111. Configure read commands for each sampling
316 -
330 +(((
317 317  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.
332 +)))
318 318  
319 -
334 +(((
320 320  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.
336 +)))
321 321  
322 -
338 +(((
323 323  To save the LoRaWAN network bandwidth, we might need to read data from different sensors and combine their valid value into a short payload.
340 +)))
324 324  
325 -
342 +(((
326 326  This section describes how to achieve above goals.
344 +)))
327 327  
328 -
346 +(((
329 329  During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
348 +)))
330 330  
331 -
350 +(((
332 332  **Command from RS485-BL to Sensor:**
352 +)))
333 333  
354 +(((
334 334  RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
356 +)))
335 335  
336 -
358 +(((
337 337  **Handle return from sensors to RS485-BL**:
360 +)))
338 338  
362 +(((
339 339  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**
364 +)))
340 340  
366 +* (((
367 +**AT+DATACUT**
368 +)))
341 341  
342 -* **AT+DATACUT**
343 -
370 +(((
344 344  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.
372 +)))
345 345  
374 +* (((
375 +**AT+SEARCH**
376 +)))
346 346  
347 -* **AT+SEARCH**
348 -
378 +(((
349 349  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.
380 +)))
350 350  
351 -
382 +(((
352 352  **Define wait timeout:**
384 +)))
353 353  
386 +(((
354 354  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
388 +)))
355 355  
356 -
390 +(((
357 357  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
392 +)))
358 358  
359 -
360 360  **Examples:**
361 361  
362 362  Below are examples for the how above AT Commands works.
363 363  
364 -
365 365  **AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
366 366  
400 +(% border="1" class="table-bordered" %)
367 367  |(((
368 368  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
369 369  
... ... @@ -376,9 +376,9 @@
376 376  
377 377  In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
378 378  
379 -
380 380  **AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
381 381  
415 +(% border="1" class="table-bordered" %)
382 382  |(((
383 383  **AT+SEARCHx=aa,xx xx xx xx xx**
384 384  
... ... @@ -396,7 +396,7 @@
396 396  
397 397  The valid data will be all bytes after 1E 56 34 , so it is 2e 30 58 5f 36 41 30 31 00 49
398 398  
399 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image013.png]]
433 +[[image:1652954654347-831.png]]
400 400  
401 401  
402 402  1. For a return string from AT+COMMAND1:  16 0c 1e 56 34 2e 30 58 5f 36 41 30 31 00 49
1652954654347-831.png
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