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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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166	166	* (((
167	167	Packet engine up to 256 bytes with CRC.
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	167	+
174	174	== 1.3 Features ==
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176	176	* LoRaWAN Class A & Class C protocol
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182	182	* Counting
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185		-
186		-
187	187	== 1.4  Applications ==
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189	189	* Smart Buildings & Home Automation
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194	194	* Smart Factory
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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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213		-
214	214	= 2. Power ON Device =
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216	216	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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332	332	* [1] RO1 relay channel is close and the RO1 LED is ON.
333	333	* [0] RO2 relay channel is open and RO2 LED is OFF;
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335		-
336	336	**LT22222-L:**
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338	338	* [1] DI2 channel is high input and DI2 LED is ON;
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493	493	Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
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779	779	== 3.4 ​Configure LT via AT or Downlink ==
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781	781	User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
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2022		-== 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
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2024		-If the device is not shut down, but directly powered off.
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2026		-It will default that this is a power-off state.
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2028		-In modes 2 to 5, DO RO status and pulse count are saved in flash.
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2030		-After restart, the status before power failure will be read from flash.
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2032	2032	= 6. Trouble Shooting =
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