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Last modified by Kilight Cao on 2025/07/03 15:34
From version 53.3
edited by Kilight Cao
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To version 55.3
edited by Kilight Cao
on 2025/07/03 15:10
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2559 2559  == 6.1 How to update the firmware? ==
2560 2560  
2561 2561  
2562 -Dragino frequently releases firmware updates for the LT-22222-L. Updating your LT-22222-L with the latest firmware version helps to:
2563 2563  
2564 -* Support new features
2565 -* Fix bugs
2566 -* Change LoRaWAN frequency bands
2567 2567  
2568 -You will need the following things before proceeding:
2569 -
2570 -* 3.5mm programming cable (included with the LT-22222-L as an additional accessory)
2571 -* USB to TTL adapter/converter
2572 -* Download and install the [[STM32 Flash loader>>url:https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html]]. (replaced by STM32CubeProgrammer)
2573 -* Download the latest firmware image from [[LT-22222-L firmware image files>>https://www.dropbox.com/sh/g99v0fxcltn9r1y/AACrbrDN0AqLHbBat0ViWx5Da/LT-22222-L/Firmware?dl=0&subfolder_nav_tracking=1]]. Check the file name of the firmware to find the correct region.
2574 -
2575 -{{info}}
2576 -As of this writing, the latest firmware version available for the LT-22222-L is v1.6.1.
2577 -{{/info}}
2578 -
2579 -Below is the hardware setup for uploading a firmware image to the LT-22222-L:
2580 -
2581 -
2582 -
2583 -
2584 -Start the STM32 Flash Loader and choose the correct COM port to update.
2585 -
2586 2586  (((
2587 2587  (((
2588 -(% style="color:blue" %)**For LT-22222-L**(%%):
2589 -
2590 -Hold down the **PRO** button, then briefly press the **RST** button. The **DO1** LED will change from OFF to ON. When the **DO1** LED is ON, it indicates that the device is in firmware download mode.
2591 -)))
2592 -
2593 -
2594 -)))
2595 -
2596 -
2597 -
2598 -
2599 -
2600 -
2601 -
2602 -(% style="color:red" %)**Note**(%%): If you have lost the programming cable, you can make one from a 3.5 mm cable. The pin mapping is as follows:
2603 -
2604 -
2605 -
2606 -(((
2607 -(((
2608 2608  == 6.2 How to change the LoRaWAN frequency band/region? ==
2609 2609  
2610 2610  
... ... @@ -2618,7 +2618,7 @@
2618 2618  (((
2619 2619  
2620 2620  
2621 -== 6.3 How to set up LT-22222-L to work with a Single Channel Gateway, such as LG01/LG02? ==
2579 +== 6.3 How to set up LT-22222-LA to work with a Single Channel Gateway, such as LG01/LG02? ==
2622 2622  
2623 2623  
2624 2624  )))
... ... @@ -2625,7 +2625,7 @@
2625 2625  
2626 2626  (((
2627 2627  (((
2628 -In this case, you need to set the LT-22222-L to work in ABP mode and transmit on only one frequency.
2586 +In this case, you need to set the LT-22222-LA to work in ABP mode and transmit on only one frequency.
2629 2629  )))
2630 2630  )))
2631 2631  
... ... @@ -2653,7 +2653,7 @@
2653 2653  
2654 2654  
2655 2655  (((
2656 -(% style="color:blue" %)**Step 2**(%%)**:  **(% style="color:#000000; font-family:Arial,sans-serif; font-size:11pt; font-style:normal; font-variant-alternates:normal; font-variant-east-asian:normal; font-variant-ligatures:normal; font-variant-numeric:normal; font-variant-position:normal; font-weight:400; text-decoration:none; white-space:pre-wrap" %)Run AT commands to configure the LT-22222-L to operate in single-frequency and ABP mode. The AT commands are as follows:
2614 +(% style="color:blue" %)**Step 2**(%%)**:  **(% style="color:#000000; font-family:Arial,sans-serif; font-size:11pt; font-style:normal; font-variant-alternates:normal; font-variant-east-asian:normal; font-variant-ligatures:normal; font-variant-numeric:normal; font-variant-position:normal; font-weight:400; text-decoration:none; white-space:pre-wrap" %)Run AT commands to configure the LT-22222-LA to operate in single-frequency and ABP mode. The AT commands are as follows:
2657 2657  
2658 2658  
2659 2659  )))
... ... @@ -2689,6 +2689,7 @@
2689 2689  (% style="color:#000000; font-family:Arial,sans-serif; font-size:11pt; font-style:normal; font-variant-alternates:normal; font-variant-east-asian:normal; font-variant-ligatures:normal; font-variant-numeric:normal; font-variant-position:normal; font-weight:400; text-decoration:none; white-space:pre-wrap" %)The following figure shows the screenshot of the command set above, issued using a serial tool:
2690 2690  )))
2691 2691  
2650 +[[image:1653360498588-932.png]]
2692 2692  
2693 2693  
2694 2694  == 6.4 How to change the uplink interval? ==
... ... @@ -2704,16 +2704,11 @@
2704 2704  You can run the AT command **AT+DEBUG** to view the counting event in the serial output. If the firmware is too old and doesn’t support AT+DEBUG, update to the latest firmware first.
2705 2705  
2706 2706  
2707 -== 6.6 Can I use point-to-point communication with LT-22222-L? ==
2708 -
2709 -
2710 -Yes, you can. Please refer to the [[Point-to-Point Communication of LT-22222-L>>https://wiki.dragino.com/xwiki/bin/view/Main/%20Point%20to%20Point%20Communication%20of%20LT-22222-L/]] page. The firmware that supports point-to-point communication can be found [[here>>https://github.com/dragino/LT-22222-L/releases]].
2711 -
2712 2712  
2713 2713  )))
2714 2714  
2715 2715  (((
2716 -== 6.7 Why does the relay output default to an open relay after the LT-22222-L is powered off? ==
2670 +== 6.6 Why does the relay output default to an open relay after the LT-22222-LA is powered off? ==
2717 2717  
2718 2718  
2719 2719  * If the device is not properly shut down and is directly powered off.
... ... @@ -2721,23 +2721,19 @@
2721 2721  * In modes 2 to 5, the DO/RO status and pulse count are saved to flash memory.
2722 2722  * After a restart, the status before the power failure will be read from Flash.
2723 2723  
2724 -== 6.8 Can I set up LT-22222-L as an NC (Normally Closed) relay? ==
2678 +== 6.7 Can I set up LT-22222-LA as an NC (Normally Closed) relay? ==
2725 2725  
2726 2726  
2727 -The LT-22222-L's built-in relay is Normally Open (NO). You can use an external relay to achieve a Normally Closed (NC) configuration. The circuit diagram is shown below:
2681 +The LT-22222-LA's built-in relay is Normally Open (NO). You can use an external relay to achieve a Normally Closed (NC) configuration. The circuit diagram is shown below:
2728 2728  
2683 +[[image:image-20221006170630-1.png]]
2729 2729  
2730 2730  
2731 2731  
2732 -== 6.9 Can the LT-22222-L save the RO state? ==
2733 2733  
2688 +== 6.8 Why does the LT-22222-LA always report 15.585V when measuring the AVI? ==
2734 2734  
2735 -To enable this feature, the firmware version must be 1.6.0 or higher.
2736 2736  
2737 -
2738 -== 6.10 Why does the LT-22222-L always report 15.585V when measuring the AVI? ==
2739 -
2740 -
2741 2741  It is likely that the GND is not connected during the measurement, or that the wire connected to the GND is loose.
2742 2742  
2743 2743  
... ... @@ -2786,7 +2786,7 @@
2786 2786  )))
2787 2787  
2788 2788  
2789 -== 7.4 Why can the LT-22222-L perform uplink normally, but cannot receive downlink? ==
2739 +== 7.4 Why can the LT-22222-LA perform uplink normally, but cannot receive downlink? ==
2790 2790  
2791 2791  
2792 2792  The FCD count of the gateway is inconsistent with the FCD count of the node, causing the downlink to remain in the queue.
... ... @@ -2840,6 +2840,6 @@
2840 2840  = 11. Reference​​​​​ =
2841 2841  
2842 2842  
2843 -* LT-22222-L: [[http:~~/~~/www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html>>url:http://www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html]]
2793 +* LT-22222-LA: [[http:~~/~~/www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html>>url:http://www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html]]
2844 2844  * [[Datasheet, Document Base>>https://www.dropbox.com/sh/gxxmgks42tqfr3a/AACEdsj_mqzeoTOXARRlwYZ2a?dl=0]]
2845 2845  * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
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