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220	220	[[image:1652953568895-172.png||height="232" width="724"]]
221	221
222		-== 3.3 Configure Commands to read data ==
223	223
224		-(((
	223	+
	224	+
	225	+1.
	226	+11. Configure Commands to read data
	227	+
225	225	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		-)))
227	227
228		-=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
229	229
	231	+1.
	232	+11.
	233	+111. Configure UART settings for RS485 or TTL communication
	234	+
230	230	RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
231	231
232		-**~1. RS485-MODBUS mode:**
	237	+1. RS485-MODBUS mode:
233	233
234	234	AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
235	235
236		-**2. TTL mode:**
237	237
	242	+1. TTL mode:
	243	+
238	238	AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
239	239
	246	+
240	240	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.
241	241
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		-(((
	249	+
	250	+|**AT Commands**|**Description**|**Example**
	251	+|AT+BAUDR|Set the baud rate (for RS485 connection). Default Value is: 9600.|(((
256	256	AT+BAUDR=9600
257		-)))
258	258
259		-(((
260	260	Options: (1200,2400,4800,14400,19200,115200)
261	261	)))
262		-)))
263		-|(((
264		-AT+PARITY
265		-)))|(% style="width:285px" %)(((
266		-(((
	256	+|AT+PARITY|(((
267	267	Set UART parity (for RS485 connection)
268		-)))
269	269
270		-(((
271	271	Default Value is: no parity.
272		-)))
273		-)))|(% style="width:347px" %)(((
274		-(((
	260	+)))|(((
275	275	AT+PARITY=0
276		-)))
277	277
278		-(((
279	279	Option: 0: no parity, 1: odd parity, 2: even parity
280	280	)))
281		-)))
282		-|(((
283		-AT+STOPBIT
284		-)))|(% style="width:285px" %)(((
285		-(((
	265	+|AT+STOPBIT|(((
286	286	Set serial stopbit (for RS485 connection)
287		-)))
288	288
289		-(((
290	290	Default Value is: 1bit.
291		-)))
292		-)))|(% style="width:347px" %)(((
293		-(((
	269	+)))|(((
294	294	AT+STOPBIT=0 for 1bit
295		-)))
296	296
297		-(((
298	298	AT+STOPBIT=1 for 1.5 bit
299		-)))
300	300
301		-(((
302	302	AT+STOPBIT=2 for 2 bits
303	303	)))
304		-)))
305	305
306	306
307	307