Changes for page LT-22222-L -- LoRa I/O Controller User Manual

Last modified by Saxer Lin on 2025/04/15 17:24

From version < 77.1 >

edited by Edwin Chen
on 2022/06/02 15:25

To version < 68.16 >

edited by Xiaoling
on 2022/05/25 15:20

Change comment: There is no comment for this version

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@@ -1,1 +1,1 @@
--XWiki.Edwin
++XWiki.Xiaoling

Content

@@ -16,7 +16,7 @@
  == 1.1 What is LT Series I/O Controller ==
  (((
--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.
++The Dragino LT series I/O Modules are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as: analog current Input, analog voltage input, relay output, digital input and digital output etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
  )))
  (((
@@ -24,7 +24,7 @@
  )))
  (((
--The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
++The LT I/O Controllers is aiming to provide a simple plug and play, low cost installation by using LoRaWAN wireless technology.
  )))
  (((
@@ -41,8 +41,6 @@
  (((
  [[image:1653295757274-912.png]]
--
--
  )))
  == 1.2  Specifications ==
@@ -153,8 +153,6 @@
  )))
  * (((
  Packet engine up to 256 bytes with CRC.
--
--
  )))
  == 1.3 Features ==
@@ -199,7 +199,6 @@
  [[image:1653297104069-180.png]]
--
  = 3. Operation Mode =
  == 3.1 How it works? ==
@@ -210,8 +210,6 @@
  (((
  In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
--
--
  )))
  == 3.2 Example to join LoRaWAN network ==
@@ -242,12 +242,10 @@
  [[image:1653297955910-247.png||height="321" width="716"]]
--
  Add APP KEY and DEV EUI
  [[image:1653298023685-319.png]]
--
  (((
  **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
  )))
@@ -254,7 +254,6 @@
  [[image:1653298044601-602.png||height="405" width="709"]]
--
  == 3.3 Uplink Payload ==
  There are five working modes + one interrupt mode on LT for different type application:
@@ -408,7 +408,6 @@
  )))
  )))
--
  === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
  **LT22222-L**: This mode the DI1 is used as a counting pin.
@@ -449,8 +449,6 @@
  (((
  Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
--
--
  )))
  === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
@@ -533,7 +533,6 @@
  )))
  )))
--
  === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
  **LT22222-L**: This mode the DI1 is used as a counting pin.
@@ -574,8 +574,6 @@
  (((
  Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
--
--
  )))
  === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
@@ -604,7 +604,6 @@
  AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
--
  (% style="color:#4f81bd" %)**Trigger base on current**:
  Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
@@ -613,7 +613,6 @@
  AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
--
  (% style="color:#4f81bd" %)**Trigger base on DI status**:
  DI status trigger Flag.
@@ -700,13 +700,10 @@
  When device got this command, it will send the MOD6 payload.
--
  === 3.3.7 Payload Decoder ===
  (((
  **Decoder for TTN/loraserver/ChirpStack**: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/]]
--
--
  )))
  == 3.4 Configure LT via AT or Downlink ==
@@ -717,7 +717,7 @@
  There are two kinds of Commands:
  )))
--* (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, 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]]
++* (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: http:~/~/wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands
  * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
@@ -725,7 +725,6 @@
  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]]
--
  === 3.4.2 Sensor related commands ===
  ==== 3.4.2.1 Set Transmit Interval ====
@@ -748,7 +748,6 @@
  **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
  )))
--
  ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
  Set work mode.
@@ -769,7 +769,6 @@
  **0x0A aa     ~/~/ Same as AT+MOD=aa**
  )))
--
  ==== 3.4.2.3 Poll an uplink ====
  * AT Command:
@@ -785,10 +785,9 @@
  **Example**: 0x08FF, ask device to send an Uplink
--
  ==== 3.4.2.4 Enable Trigger Mode ====
--Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
++Use of trigger mode, please check [[ADDMOD6>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
  * AT Command:
@@ -808,7 +808,6 @@
  **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
  )))
--
  ==== 3.4.2.5 Poll trigger settings ====
  Poll trigger settings,
@@ -824,7 +824,6 @@
  **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
  )))
--
  ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
  Enable Disable DI1/DI2/DI2 as trigger,
@@ -847,7 +847,6 @@
  **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
  )))
--
  ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
  Set DI1 or DI3(for LT-33222-L) trigger.
@@ -874,7 +874,6 @@
  **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
  )))
--
  ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
  Set DI2 trigger.
@@ -901,10 +901,9 @@
  **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
  )))
--
  ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
--Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
++Set current trigger , base on AC port. See [[trigger mode>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
  * AT Command:
@@ -917,19 +917,18 @@
  (% class="box infomessage" %)
  (((
--**0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
++**0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]**
  )))
--
  ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
--Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
++Set current trigger , base on AV port. See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
  * AT Command:
  (% class="box infomessage" %)
  (((
--**AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
++**AT+AVLIM. See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]**
  )))
  * Downlink Payload (prefix 0xAA 00 ):
@@ -936,10 +936,9 @@
  (% class="box infomessage" %)
  (((
--**0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
++**0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]] **
  )))
--
  ==== 3.4.2.11 Trigger – Set minimum interval ====
  Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
@@ -958,7 +958,6 @@
  **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
  )))
--
  ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
  * AT Command:
@@ -1133,13 +1133,13 @@
  ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
--When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
++When voltage exceed the threshold, count. Feature see [[MOD4>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting]]
  * AT Command:
  (% class="box infomessage" %)
  (((
--**AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
++**AT+VOLMAX    ~/~/ See [[MOD4>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting]]**
  )))
  * Downlink Payload (prefix 0xA5):
@@ -1149,7 +1149,6 @@
  **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
  )))
--
  ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
  * AT Command:
@@ -1174,7 +1174,6 @@
  **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
  )))
--
  ==== 3.4.2.18 Counting ~-~- Clear Counting ====
  Clear counting for counting mode
@@ -1193,7 +1193,6 @@
  **0x A6 01     ~/~/ clear all counting,**
  )))
--
  ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
  * AT Command:
@@ -1212,8 +1212,6 @@
  (((
  range: aa bb cc:0 to 16777215,  (unit:second)
--
--
  )))
  == 3.5 Integrate with Mydevice ==
@@ -1234,7 +1234,6 @@
  [[image:image-20220524094641-12.png||height="402" width="718"]]
--
  **Step 3**: Create an account or log in Mydevices.
  **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
@@ -1243,7 +1243,6 @@
  [[image:1653356838789-523.png||height="337" width="740"]]
--
  After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
  [[image:image-20220524094909-1.png||height="335" width="729"]]
@@ -1256,7 +1256,6 @@
  [[image:image-20220524094909-5.png||height="341" width="734"]]
--
  == 3.6 Interface Detail ==
  === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
@@ -1265,7 +1265,6 @@
  [[image:1653356991268-289.png]]
--
  === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
  (((
@@ -1281,105 +1281,51 @@
  [[image:1653357170703-587.png]]
  (((
--(((
  When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
  )))
--)))
--(((
--
--)))
--(((
  **Example1**: Connect to a Low active sensor.
--)))
--(((
  This type of sensor will output a low signal GND when active.
--)))
--* (((
--Connect sensor’s output to DI1-
--)))
--* (((
--Connect sensor’s VCC to DI1+.
--)))
++* Connect sensor’s output to DI1-
++* Connect sensor’s VCC to DI1+.
--(((
--So when sensor active, the current between NEC2501 pin1 and pin2 is：
--)))
++So when sensor active, the current between NEC2501 pin1 and pin2 is：
--(((
--[[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
--)))
++[[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**  [[image:image-20220524095628-8.png]]  = DI1+ / 1K.**
--(((
--If DI1+ = 12v, the [[image:1653968155772-850.png||height="23" width="19"]]= 12mA , So the LT-22222-L will be able to detect this active signal.
--)))
++If DI1+ = 12v, the //IF//  = 12mA , So the LT-22222-L will be able to detect this active signal.
--(((
--
--)))
--(((
  **Example2**: Connect to a High active sensor.
--)))
--(((
  This type of sensor will output a high signal (example 24v) when active.
--)))
--* (((
--Connect sensor’s output to DI1+
--)))
--* (((
--Connect sensor’s GND DI1-.
--)))
++* Connect sensor’s output to DI1+
++* Connect sensor’s GND DI1-.
--(((
  So when sensor active, the current between NEC2501 pin1 and pin2 is:
--)))
--(((
--[[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
--)))
++[[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**    [[image:image-20220524095628-8.png]]= DI1+ / 1K.**
--(((
--If **DI1+ = 24v**, the[[image:1653968155772-850.png||height="23" width="19"]] 24mA , So the LT-22222-L will be able to detect this high active signal.
--)))
++If **DI1+ = 24v**, the [[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]]** = 24mA , So the LT-22222-L will be able to detect this high active signal.
--(((
--
--)))
--(((
  **Example3**: Connect to a 220v high active sensor.
--)))
--(((
  Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler
--)))
--* (((
--Connect sensor’s output to DI1+ with a serial 50K resistor
--)))
--* (((
--Connect sensor’s GND DI1-.
--)))
++* Connect sensor’s output to DI1+ with a serial 50K resistor
++* Connect sensor’s GND DI1-.
--(((
  So when sensor active, the current between NEC2501 pin1 and pin2 is:
--)))
--(((
--   [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
--)))
++   [[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]] = DI1+ / 51K.**
--(((
--If sensor output is 220v, the [[image:1653968155772-850.png||height="23" width="19"]](% id="cke_bm_243359S" style="display:none" %)[[image:image-20220524095628-8.png]](%%) = DI1+ / 51K.  = 4.3mA , So the LT-22222-L will be able to detect this high active signal safely.
--)))
++If sensor output is 220v, the (% id="cke_bm_243359S" style="display:none" %)[[image:image-20220524095628-8.png]](%%) = DI1+ / 51K.  = 4.3mA , So the LT-22222-L will be able to detect this high active signal safely.
--
  === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
  NPN output: GND or Float. Max voltage can apply to output pin is 36v.
@@ -1386,7 +1386,6 @@
  [[image:1653357531600-905.png]]
--
  === 3.6.4 Analog Input Interface ===
  The analog input interface is as below. The LT will measure the IN2 voltage so to calculate the current pass the Load. The formula is:
@@ -1414,7 +1414,6 @@
  [[image:1653357648330-671.png||height="155" width="733"]]
--
  === 3.6.5 Relay Output ===
  (((
@@ -1425,12 +1425,10 @@
  [[image:image-20220524100215-10.png||height="382" width="723"]]
--
  == 3.7 LEDs Indicators ==
  [[image:image-20220524100748-11.png]]
--
  = 4. Use AT Command =
  == 4.1 Access AT Command ==
@@ -1631,8 +1631,6 @@
  (((
  AT+CFG: Print all settings
--
--
  )))
  == 4.2 Common AT Command Sequence ==
@@ -1674,8 +1674,6 @@
  (((
  (% style="background-color:#dcdcdc" %)ATZ
--
--
  )))
  === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
@@ -1757,7 +1757,6 @@
  (% style="background-color:#dcdcdc" %)AT+CLASS=A
  ATZ
--
  = 5. FAQ =
  == 5.1 How to upgrade the image? ==
@@ -1788,7 +1788,6 @@
  [[image:1653360054704-518.png||height="186" width="745"]]
--
  (((
  (((
  == 5.2 How to change the LoRa Frequency Bands/Region? ==
@@ -1797,8 +1797,6 @@
  (((
  User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
--
--
  )))
  (((
@@ -1852,18 +1852,10 @@
  [[image:1653360498588-932.png||height="485" width="726"]]
--
  == 5.4 Can I see counting event in Serial? ==
  (((
  User can run AT+DEBUG command to see the counting event in serial. If firmware too old and doesn’t support AT+DEBUG. User can update to latest firmware first.
--
--
--== 5.5 Can i use point to point communication for LT-22222-L? ==
--
--Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
--
--
  )))
  (((
@@ -1877,8 +1877,10 @@
  )))
  (((
--Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
++Please see this link for how to debug:
++[[http:~~/~~/wiki1.dragino.com/xwiki/bin/view/Main/LoRaWAN%20Communication%20Debug/#H5.1Howitwork>>http://wiki1.dragino.com/xwiki/bin/view/Main/LoRaWAN%20Communication%20Debug/#H5.1Howitwork]]
++
  )))
@@ -1887,7 +1887,9 @@
  )))
  (((
--See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
++See this link for trouble shooting:
++
++[[http:~~/~~/wiki1.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/>>http://wiki1.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/]]
  )))
  (((
@@ -1899,7 +1899,9 @@
  )))
  (((
--It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
++It might be about the channels mapping. Please see this link for detail:
++
++[[http:~~/~~/wiki1.dragino.com/xwiki/bin/view/Main/LoRaWAN%20Communication%20Debug/#H2.NoticeofUS9152FCN4702FAU915Frequencyband>>http://wiki1.dragino.com/xwiki/bin/view/Main/LoRaWAN%20Communication%20Debug/#H2.NoticeofUS9152FCN4702FAU915Frequencyband]]
  )))
  (((
@@ -1973,8 +1973,6 @@
  (((
  * (((
  (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
--
--
  )))
  = 8. Packing Info =
@@ -2007,8 +2007,6 @@
  * Device Weight: 105g
  * Package Size / pcs : 14.5 x 8 x 5 cm
  * Weight / pcs : 170g
--
--
  )))
  )))
@@ -2030,8 +2030,6 @@
  (((
  (((
           [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
--
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Changes for page LT-22222-L -- LoRa I/O Controller User Manual

Summary

Details

Applications

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