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1169	1169
1170	1170	=== 3.6.5 Relay Output ===
1171	1171
1172		-(((
1173	1173	The LT serial controller has two relay interfaces; each interface uses two pins of the screw terminal. User can connect other device’s Power Line to in serial of RO1_1 and RO_2. Such as below:
1174		-)))
1175	1175
1176	1176
1177	1177	[[image:image-20220524100215-9.png]]
1178	1178
	1177	+
1179	1179	[[image:image-20220524100215-10.png||height="382" width="723"]]
1180	1180
1181	1181
1182		-== 3.7 LEDs Indicators ==
1183	1183
1184		-[[image:image-20220524100748-11.png]]
1185	1185
1186		-= 4. Use AT Command =
1187	1187
1188		-== 4.1 Access AT Command ==
1189	1189
	1185	+1.
	1186	+11. LEDs Indicators
	1187	+
	1188	+(% border="1" style="background-color:#f7faff" %)
	1189	+|**LEDs**|**Feature**
	1190	+|**PWR**|Always on if there is power
	1191	+|**SYS**|After device is powered on, the SYS will **fast blink in GREEN** for 5 times, means RS485-LN start to join LoRaWAN network. If join success, SYS will be **on GREEN for 5 seconds. **SYS will **blink Blue** on every upload and **blink Green** once receive a downlink message.
	1192	+|**TX**|(((
	1193	+Device boot: TX blinks 5 times.
	1194	+
	1195	+Successful join network: TX ON for 5 seconds.
	1196	+
	1197	+Transmit a LoRa packet: TX blinks once
	1198	+)))
	1199	+|**RX**|RX blinks once when receive a packet.
	1200	+|**DO1**|
	1201	+|**DO2**|
	1202	+|**DO3**|
	1203	+|**DI2**|(((
	1204	+For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
	1205	+
	1206	+For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
	1207	+)))
	1208	+|**DI2**|(((
	1209	+For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
	1210	+
	1211	+For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
	1212	+)))
	1213	+|**DI3**|For LT-33222-L ONLY: ON when DI3 is low, LOW when DI3 is high
	1214	+|**DI2**|(((
	1215	+For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
	1216	+
	1217	+For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
	1218	+)))
	1219	+|**RO1**|
	1220	+|**RO2**|
	1221	+
	1222	+1. Use AT Command
	1223	+11. Access AT Command
	1224	+
1190	1190	LT supports AT Command set. User can use a USB to TTL adapter plus the 3.5mm Program Cable to connect to LT for using AT command, as below.
1191	1191
1192	1192	[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image029.png]]

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