Last modified by Karry Zhuang on 2025/03/06 16:34
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From version < 15.2 >
edited by Xiaoling
on 2022/05/19 17:47
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edited by Xiaoling
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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
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167 167  
168 168  [[image:1652953414711-647.png||height="337" width="723"]]
169 169  
170 +(((
170 170  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 +)))
171 171  
174 +(((
172 172  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 +)))
173 173  
178 +(((
174 174  **Step 1**: Create a device in TTN V3 with the OTAA keys from RS485-BL.
180 +)))
175 175  
182 +(((
176 176  Each RS485-BL is shipped with a sticker with unique device EUI:
184 +)))
177 177  
178 178  [[image:1652953462722-299.png]]
179 179  
188 +(((
180 180  User can enter this key in their LoRaWAN Server portal. Below is TTN V3 screen shot:
190 +)))
181 181  
192 +(((
182 182  Add APP EUI in the application.
194 +)))
183 183  
184 184  
185 185  
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207 207  
208 208  [[image:1652953568895-172.png||height="232" width="724"]]
209 209  
222 +== 3.3 Configure Commands to read data ==
210 210  
211 -
212 -
213 -1.
214 -11. Configure Commands to read data
215 -
224 +(((
216 216  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 +)))
217 217  
228 +=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
218 218  
219 -1.
220 -11.
221 -111. Configure UART settings for RS485 or TTL communication
222 -
223 223  RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
224 224  
225 -1. RS485-MODBUS mode:
232 +**~1. RS485-MODBUS mode:**
226 226  
227 227  AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
228 228  
236 +**2. TTL mode:**
229 229  
230 -1. TTL mode:
231 -
232 232  AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
233 233  
234 -
235 235  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.
236 236  
237 -
238 -|**AT Commands**|**Description**|**Example**
239 -|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 +(((
240 240  AT+BAUDR=9600
257 +)))
241 241  
259 +(((
242 242  Options: (1200,2400,4800,14400,19200,115200)
243 243  )))
244 -|AT+PARITY|(((
262 +)))
263 +|(((
264 +AT+PARITY
265 +)))|(% style="width:285px" %)(((
266 +(((
245 245  Set UART parity (for RS485 connection)
268 +)))
246 246  
270 +(((
247 247  Default Value is: no parity.
248 -)))|(((
272 +)))
273 +)))|(% style="width:347px" %)(((
274 +(((
249 249  AT+PARITY=0
276 +)))
250 250  
278 +(((
251 251  Option: 0: no parity, 1: odd parity, 2: even parity
252 252  )))
253 -|AT+STOPBIT|(((
281 +)))
282 +|(((
283 +AT+STOPBIT
284 +)))|(% style="width:285px" %)(((
285 +(((
254 254  Set serial stopbit (for RS485 connection)
287 +)))
255 255  
289 +(((
256 256  Default Value is: 1bit.
257 -)))|(((
291 +)))
292 +)))|(% style="width:347px" %)(((
293 +(((
258 258  AT+STOPBIT=0 for 1bit
295 +)))
259 259  
297 +(((
260 260  AT+STOPBIT=1 for 1.5 bit
299 +)))
261 261  
301 +(((
262 262  AT+STOPBIT=2 for 2 bits
263 263  )))
304 +)))
264 264  
306 +=== 3.3.2 Configure sensors ===
265 265  
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 +)))
266 266  
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 +)))
267 267  
268 -1.
269 -11.
270 -111. Configure sensors
271 -
272 -Some sensors might need to configure before normal operation. User can configure such sensor via PC or through RS485-BL AT Commands AT+CFGDEV.
273 -
274 -
275 -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.
276 -
277 -|**AT Commands**|**Description**|**Example**
278 -|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" %)(((
279 279  This command is used to configure the RS485/TTL devices; they won’t be used during sampling.
280 280  
281 -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,
282 282  
283 -m: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
284 -)))|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
285 285  
286 286  Detail of AT+CFGDEV command see [[AT+CFGDEV detail>>path:#AT_CFGDEV]].
287 287  
328 +=== 3.3.3 Configure read commands for each sampling ===
288 288  
289 -
290 -
291 -
292 -1.
293 -11.
294 -111. Configure read commands for each sampling
295 -
330 +(((
296 296  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 +)))
297 297  
298 -
334 +(((
299 299  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 +)))
300 300  
301 -
338 +(((
302 302  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 +)))
303 303  
304 -
342 +(((
305 305  This section describes how to achieve above goals.
344 +)))
306 306  
307 -
346 +(((
308 308  During each sampling, the RS485-BL can support 15 commands to read sensors. And combine the return to one or several uplink payloads.
348 +)))
309 309  
310 -
350 +(((
311 311  **Command from RS485-BL to Sensor:**
352 +)))
312 312  
354 +(((
313 313  RS485-BL can send out pre-set max 15 strings via **AT+COMMAD1**, **ATCOMMAND2**,…, to **AT+COMMANDF** . All commands are of same grammar.
356 +)))
314 314  
315 -
358 +(((
316 316  **Handle return from sensors to RS485-BL**:
360 +)))
317 317  
362 +(((
318 318  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 +)))
319 319  
366 +* (((
367 +**AT+DATACUT**
368 +)))
320 320  
321 -* **AT+DATACUT**
322 -
370 +(((
323 323  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 +)))
324 324  
374 +* (((
375 +**AT+SEARCH**
376 +)))
325 325  
326 -* **AT+SEARCH**
327 -
378 +(((
328 328  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 +)))
329 329  
330 -
382 +(((
331 331  **Define wait timeout:**
384 +)))
332 332  
386 +(((
333 333  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 +)))
334 334  
335 -
390 +(((
336 336  After we got the valid value from each RS485 commands, we need to combine them together with the command **AT+DATAUP**.
392 +)))
337 337  
338 -
339 339  **Examples:**
340 340  
341 341  Below are examples for the how above AT Commands works.
342 342  
343 -
344 344  **AT+COMMANDx : **This command will be sent to RS485/TTL devices during each sampling, Max command length is 14 bytes. The grammar is:
345 345  
400 +(% border="1" class="table-bordered" %)
346 346  |(((
347 347  **AT+COMMANDx=xx xx xx xx xx xx xx xx xx xx xx xx,m**
348 348  
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355 355  
356 356  In the RS485-BL, we should use this command AT+COMMAND1=01 03 0B B8 00 02,1 for the same.
357 357  
358 -
359 359  **AT+SEARCHx**: This command defines how to handle the return from AT+COMMANDx.
360 360  
415 +(% border="1" class="table-bordered" %)
361 361  |(((
362 362  **AT+SEARCHx=aa,xx xx xx xx xx**
363 363  
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375 375  
376 376  The valid data will be all bytes after 1E 56 34 , so it is 2e 30 58 5f 36 41 30 31 00 49
377 377  
378 -[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image013.png]]
433 +[[image:1652954654347-831.png]]
379 379  
380 380  
381 381  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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1653266934636-343.png
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