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19	19	== 1.1 What is LT Series I/O Controller ==
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22	22	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	+
51	51	== 1.2  Specifications ==
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163	163	* (((
164	164	Packet engine up to 256 bytes with CRC.
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166	166
167	167	== 1.3 Features ==
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174	174	* Firmware upgradable via program port
175	175	* Counting
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177	177	== 1.4  Applications ==
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179	179	* Smart Buildings & Home Automation
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183	183	* Smart Cities
184	184	* Smart Factory
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186	186	== 1.5 Hardware Variants ==
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188	188	(% border="1" style="background-color:#f7faff; width:500px" %)
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196	196	* 1 x Counting Port
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199	199	= 2. Power ON Device =
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201	201	The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
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314	314	* [1] RO1 relay channel is close and the RO1 LED is ON.
315	315	* [0] RO2 relay channel is open and RO2 LED is OFF;
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317		-
318	318	**LT22222-L:**
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320	320	* [1] DI2 channel is high input and DI2 LED is ON;
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768	768	* (% 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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772	772	=== 3.4.1 Common Commands ===
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774	774	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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	2015	+== 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
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	2017	+If the device is not shut down, but directly powered off.
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	2019	+It will default that this is a power-off state.
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	2021	+In modes 2 to 5, DO RO status and pulse count are saved in flash.
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	2023	+After restart, the status before power failure will be read from flash.
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2005	2005	= 6. Trouble Shooting =
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