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1167	1167
1168	1168	[[image:1653357648330-671.png||height="155" width="733"]]
1169	1169
	1170	+=== 3.6.5 Relay Output ===
1170	1170
1171		-
1172		-1.
1173		-11.
1174		-111. Relay Output
1175		-
	1172	+(((
1176	1176	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	+)))
1177	1177
1178		-[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image027.png]]
1179	1179
	1177	+[[image:image-20220524100215-9.png]]
1180	1180
1181		-[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image028.png]]
	1179	+[[image:image-20220524100215-10.png||height="382" width="723"]]
1182	1182
1183	1183
	1182	+== 3.7 LEDs Indicators ==
1184	1184
	1184	+[[image:image-20220524100748-11.png]]
1185	1185
	1186	+= 4. Use AT Command =
1186	1186
1187		-1.
1188		-11. LEDs Indicators
	1188	+== 4.1 Access AT Command ==
1189	1189
1190		-(% border="1" style="background-color:#f7faff" %)
1191		-|**LEDs**|**Feature**
1192		-|**PWR**|Always on if there is power
1193		-|**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.
1194		-|**TX**|(((
1195		-Device boot: TX blinks 5 times.
1196		-
1197		-Successful join network: TX ON for 5 seconds.
1198		-
1199		-Transmit a LoRa packet: TX blinks once
1200		-)))
1201		-|**RX**|RX blinks once when receive a packet.
1202		-|**DO1**|
1203		-|**DO2**|
1204		-|**DO3**|
1205		-|**DI2**|(((
1206		-For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
1207		-
1208		-For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
1209		-)))
1210		-|**DI2**|(((
1211		-For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
1212		-
1213		-For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
1214		-)))
1215		-|**DI3**|For LT-33222-L ONLY: ON when DI3 is low, LOW when DI3 is high
1216		-|**DI2**|(((
1217		-For LT-22222-L: ON when DI2 is high, LOW when DI2 is low
1218		-
1219		-For LT-33222-L: ON when DI2 is low, LOW when DI2 is high
1220		-)))
1221		-|**RO1**|
1222		-|**RO2**|
1223		-
1224		-1. Use AT Command
1225		-11. Access AT Command
1226		-
1227	1227	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.
1228	1228
1229	1229	[[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image029.png]]

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