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220	220	[[image:1652953568895-172.png||height="232" width="724"]]
221	221
	222	+== 3.3 Configure Commands to read data ==
222	222
223		-
224		-
225		-1.
226		-11. Configure Commands to read data
227		-
	224	+(((
228	228	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	+)))
229	229
	228	+=== 3.3.1 onfigure UART settings for RS485 or TTL communication ===
230	230
231		-1.
232		-11.
233		-111. Configure UART settings for RS485 or TTL communication
234		-
235	235	RS485-BL can connect to either RS485 sensors or TTL sensor. User need to specify what type of sensor need to connect.
236	236
237		-1. RS485-MODBUS mode:
	232	+**~1. RS485-MODBUS mode:**
238	238
239	239	AT+MOD=1 ~/~/ Support RS485-MODBUS type sensors. User can connect multiply RS485 , Modbus sensors to the A / B pins.
240	240
	236	+**2. TTL mode:**
241	241
242		-1. TTL mode:
243		-
244	244	AT+MOD=2 ~/~/ Support TTL Level sensors, User can connect one TTL Sensor to the TXD/RXD/GND pins.
245	245
246		-
247	247	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.
248	248
249		-
250		-|**AT Commands**|**Description**|**Example**
251		-|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	+(((
252	252	AT+BAUDR=9600
	257	+)))
253	253
	259	+(((
254	254	Options: (1200,2400,4800,14400,19200,115200)
255	255	)))
256		-|AT+PARITY|(((
	262	+)))
	263	+|(((
	264	+AT+PARITY
	265	+)))|(% style="width:285px" %)(((
	266	+(((
257	257	Set UART parity (for RS485 connection)
	268	+)))
258	258
	270	+(((
259	259	Default Value is: no parity.
260		-)))|(((
	272	+)))
	273	+)))|(% style="width:347px" %)(((
	274	+(((
261	261	AT+PARITY=0
	276	+)))
262	262
	278	+(((
263	263	Option: 0: no parity, 1: odd parity, 2: even parity
264	264	)))
265		-|AT+STOPBIT|(((
	281	+)))
	282	+|(((
	283	+AT+STOPBIT
	284	+)))|(% style="width:285px" %)(((
	285	+(((
266	266	Set serial stopbit (for RS485 connection)
	287	+)))
267	267
	289	+(((
268	268	Default Value is: 1bit.
269		-)))|(((
	291	+)))
	292	+)))|(% style="width:347px" %)(((
	293	+(((
270	270	AT+STOPBIT=0 for 1bit
	295	+)))
271	271
	297	+(((
272	272	AT+STOPBIT=1 for 1.5 bit
	299	+)))
273	273
	301	+(((
274	274	AT+STOPBIT=2 for 2 bits
275	275	)))
	304	+)))
276	276
277	277
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