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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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317	317	* [1] RO1 relay channel is close and the RO1 LED is ON.
318	318	* [0] RO2 relay channel is open and RO2 LED is OFF;
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	317	+
320	320	**LT22222-L:**
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322	322	* [1] DI2 channel is high input and DI2 LED is ON;
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770	770	* (% 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	+
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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2000	2000	)))
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2003		-== 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
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2004	2004
2005		-If the device is not shut down, but directly powered off.
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2007		-It will default that this is a power-off state.
2008		-
2009		-In modes 2 to 5, DO RO status and pulse count are saved in flash.
2010		-
2011		-After restart, the status before power failure will be read from flash.
2012		-
2013	2013	= 6. Trouble Shooting =
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2015	2015