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From version < 54.2 >
edited by Xiaoling
on 2022/05/24 10:02
To version < 55.2 >
edited by Xiaoling
on 2022/05/24 10:10
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1169 1169  
1170 1170  === 3.6.5 Relay Output ===
1171 1171  
1172 +(((
1172 1172  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 +)))
1173 1173  
1174 1174  
1175 1175  [[image:image-20220524100215-9.png]]
1176 1176  
1177 -
1178 1178  [[image:image-20220524100215-10.png||height="382" width="723"]]
1179 1179  
1180 1180  
1182 +== 3.7 LEDs Indicators ==
1181 1181  
1184 +[[image:image-20220524100748-11.png]]
1182 1182  
1186 += 4. Use AT Command =
1183 1183  
1188 +== 4.1 Access AT Command ==
1184 1184  
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 -
1225 1225  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.
1226 1226  
1227 1227  [[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image029.png]]
image-20220524100748-11.png
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