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19	19	== 1.1 What is LT Series I/O Controller ==
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24	24	The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
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53		-
54	54	== 1.2  Specifications ==
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165	165	)))
166	166	* (((
167	167	Packet engine up to 256 bytes with CRC.
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169		-
170		-
171		-
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173	173
174	174	== 1.3 Features ==
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181	181	* Firmware upgradable via program port
182	182	* Counting
183	183
184		-
185		-
186		-
187	187	== 1.4  Applications ==
188	188
189	189	* Smart Buildings & Home Automation
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193	193	* Smart Cities
194	194	* Smart Factory
195	195
196		-
197		-
198		-
199	199	== 1.5 Hardware Variants ==
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201	201	(% border="1" style="background-color:#f7faff; width:500px" %)
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327	327	* [1] RO1 relay channel is close and the RO1 LED is ON.
328	328	* [0] RO2 relay channel is open and RO2 LED is OFF;
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	317	+
330	330	**LT22222-L:**
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332	332	* [1] DI2 channel is high input and DI2 LED is ON;
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779	779
780	780	* (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
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	771	+
782	782	=== 3.4.1 Common Commands ===
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784	784	They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
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2013		-== 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
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2014	2014
2015		-If the device is not shut down, but directly powered off.
2016		-
2017		-It will default that this is a power-off state.
2018		-
2019		-In modes 2 to 5, DO RO status and pulse count are saved in flash.
2020		-
2021		-After restart, the status before power failure will be read from flash.
2022		-
2023	2023	= 6. Trouble Shooting =
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