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Last modified by Xiaoling on 2025/04/23 15:57
From version 40.34
edited by Xiaoling
on 2022/06/06 09:53
Change comment: There is no comment for this version
To version 40.35
edited by Xiaoling
on 2022/06/06 09:56
Change comment: There is no comment for this version

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261 261  
262 262  === 3.3.1 onfigure UART settings for RS485 or TTL communication ===
263 263  
264 +(((
264 264  RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
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265 265  
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266 266  **~1. RS485-MODBUS mode:**
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267 267  
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268 268  AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
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269 269  
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270 270  **2. TTL mode:**
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271 271  
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272 272  AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
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273 273  
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274 274  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.
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275 275  
276 276  (% border="1" style="background-color:#ffffcc; color:green; width:795px" %)
277 277  |(((
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278 278  **AT Commands**
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279 279  )))|(% style="width:285px" %)(((
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280 280  **Description**
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281 281  )))|(% style="width:347px" %)(((
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282 282  **Example**
283 283  )))
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284 284  |(((
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285 285  AT+BAUDR
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286 286  )))|(% style="width:285px" %)(((
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287 287  Set the baud rate (for RS485 connection). Default Value is: 9600.
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288 288  )))|(% style="width:347px" %)(((
289 289  (((
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290 290  AT+BAUDR=9600
291 291  )))
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292 292  
293 293  (((
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294 294  Options: (1200,2400,4800,14400,19200,115200)
295 295  )))
296 296  )))
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297 297  |(((
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298 298  AT+PARITY
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299 299  )))|(% style="width:285px" %)(((
300 300  (((
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301 301  Set UART parity (for RS485 connection)
302 302  )))
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303 303  
304 304  (((
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305 305  Default Value is: no parity.
306 306  )))
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307 307  )))|(% style="width:347px" %)(((
308 308  (((
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309 309  AT+PARITY=0
310 310  )))
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311 311  
312 312  (((
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313 313  Option: 0: no parity, 1: odd parity, 2: even parity
314 314  )))
315 315  )))
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316 316  |(((
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317 317  AT+STOPBIT
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318 318  )))|(% style="width:285px" %)(((
319 319  (((
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320 320  Set serial stopbit (for RS485 connection)
321 321  )))
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322 322  
323 323  (((
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324 324  Default Value is: 1bit.
325 325  )))
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326 326  )))|(% style="width:347px" %)(((
327 327  (((
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328 328  AT+STOPBIT=0 for 1bit
329 329  )))
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330 330  
331 331  (((
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332 332  AT+STOPBIT=1 for 1.5 bit
333 333  )))
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334 334  
335 335  (((
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336 336  AT+STOPBIT=2 for 2 bits
337 337  )))
338 338  )))
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339 339  
340 340  
341 341  === 3.3.2 Configure sensors ===