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Last modified by Kilight Cao on 2025/07/03 15:34
From version 52.2
edited by Kilight Cao
on 2025/07/03 14:56
Change comment: There is no comment for this version
To version 55.3
edited by Kilight Cao
on 2025/07/03 15:10
Change comment: There is no comment for this version

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... ... @@ -2409,13 +2409,13 @@
2409 2409  (((
2410 2410  You can use a USB-to-TTL adapter/converter along with a 3.5mm Program Cable to connect the LT-22222-LA to a PC, as shown below.
2411 2411  
2412 -(% title="Click and drag to resize" %)​​​
2412 +(% title="Click and drag to resize" %)​​[[image:1751525987713-642.png]]​
2413 2413  
2414 2414  
2415 2415  )))
2416 2416  
2417 2417  (((
2418 -On the PC, you need to set the (% style="color:#4f81bd" %)**serial tool **(%%)(such as [[PuTTY>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]] or [[SecureCRT>>https://www.vandyke.com/cgi-bin/releases.php?product=securecrt]]) to a baud rate of (% style="color:green" %)**9600**(%%) to access the serial console of LT-22222-L. Access to AT commands is disabled by default, and a password (default: (% style="color:green" %)**123456**)(%%) must be entered to enable AT command access, as shown below:
2418 +On the PC, you need to set the (% style="color:#4f81bd" %)**serial tool **(%%)(such as [[PuTTY>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]] or [[SecureCRT>>https://www.vandyke.com/cgi-bin/releases.php?product=securecrt]]) to a baud rate of (% style="color:green" %)**9600**(%%) to access the serial console of LT-22222-LA. Access to AT commands is disabled by default, and a password (default: (% style="color:green" %)**123456**)(%%) must be entered to enable AT command access, as shown below:
2419 2419  )))
2420 2420  
2421 2421  [[image:1653358355238-883.png]]
... ... @@ -2422,13 +2422,13 @@
2422 2422  
2423 2423  
2424 2424  (((
2425 -== 4.2 LT-22222-L related AT commands ==
2425 +== 4.2 LT-22222-LA related AT commands ==
2426 2426  
2427 2427  
2428 2428  )))
2429 2429  
2430 2430  (((
2431 -The following is the list of all the AT commands related to the LT-22222-L, except for those used for switching between working modes.
2431 +The following is the list of all the AT commands related to the LT-22222-LA, except for those used for switching between working modes.
2432 2432  
2433 2433  * **##AT##+<CMD>?** : Help on <CMD>
2434 2434  * **##AT##+<CMD>** : Run <CMD>
... ... @@ -2525,85 +2525,11 @@
2525 2525  )))
2526 2526  
2527 2527  
2528 -=== 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
2529 -
2530 2530  (((
2531 2531  
2532 -
2533 -(((
2534 -(% style="background-color:#dcdcdc" %)**123456**(%%)  ~/~/ Enter the password to enable AT commands access
2535 2535  )))
2536 -)))
2537 2537  
2538 -(((
2539 -(% style="background-color:#dcdcdc" %)** AT+FDR**(%%)  ~/~/ Reset parameters to Factory Default, Reserve keys
2540 -)))
2541 2541  
2542 -(((
2543 -(% style="background-color:#dcdcdc" %)** 123456**(%%)  ~/~/ Enter the password to enable AT command access
2544 -)))
2545 -
2546 -(((
2547 -(% style="background-color:#dcdcdc" %)** AT+CLASS=C**(%%)  ~/~/ Set to CLASS C mode
2548 -)))
2549 -
2550 -(((
2551 -(% style="background-color:#dcdcdc" %)** AT+NJM=0**(%%)  ~/~/ Set to ABP mode
2552 -)))
2553 -
2554 -(((
2555 -(% style="background-color:#dcdcdc" %) **AT+ADR=0**(%%)  ~/~/ Set the Adaptive Data Rate Off
2556 -)))
2557 -
2558 -(((
2559 -(% style="background-color:#dcdcdc" %)** AT+DR=5**(%%)  ~/~/ Set Data Rate
2560 -)))
2561 -
2562 -(((
2563 -(% style="background-color:#dcdcdc" %)** AT+TDC=60000**(%%)  ~/~/ Set transmit interval to 60 seconds
2564 -)))
2565 -
2566 -(((
2567 -(% style="background-color:#dcdcdc" %)** AT+CHS=868400000**(%%)  ~/~/ Set transmit frequency to 868.4 MHz
2568 -)))
2569 -
2570 -(((
2571 -(% style="background-color:#dcdcdc" %)** AT+RX2FQ=868400000**(%%)  ~/~/ Set RX2 frequency to 868.4 MHz (according to the result from the server)
2572 -)))
2573 -
2574 -(((
2575 -(% style="background-color:#dcdcdc" %)** AT+RX2DR=5**(%%)** ** ~/~/ Set RX2 DR to match the downlink DR from the server. See below.
2576 -)))
2577 -
2578 -(((
2579 -(% style="background-color:#dcdcdc" %)** AT+DADDR=26 01 1A F1** (%%) ~/~/ Set Device Address. The Device Address can be found in the application on the LoRaWAN NS.
2580 -)))
2581 -
2582 -(((
2583 -(% style="background-color:#dcdcdc" %)** ATZ**         (%%) ~/~/ Reset MCU
2584 -
2585 -
2586 -)))
2587 -
2588 -(((
2589 -(% style="color:red" %)**Note:**
2590 -)))
2591 -
2592 -(((
2593 -**~1. Ensure that the device is set to ABP mode in the LoRaWAN Network Server.**
2594 -
2595 -**2. Verify that the LG01/02 gateway RX frequency matches the AT+CHS setting exactly.**
2596 -
2597 -**3. Make sure the SF/bandwidth settings in the LG01/LG02 match the settings of AT+DR. Refer to [[this link>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.**
2598 -
2599 -**4. The commands AT+RX2FQ and AT+RX2DR enable downlink functionality. To set the correct parameters, you can check the actual downlink parameters to be used as shown below. Here, RX2FQ should be set to 868400000 and RX2DR should be set to 5.**
2600 -)))
2601 -
2602 -(((
2603 -
2604 -)))
2605 -
2606 -
2607 2607  === 4.2.3 Change to Class A ===
2608 2608  
2609 2609  
... ... @@ -2633,52 +2633,10 @@
2633 2633  == 6.1 How to update the firmware? ==
2634 2634  
2635 2635  
2636 -Dragino frequently releases firmware updates for the LT-22222-L. Updating your LT-22222-L with the latest firmware version helps to:
2637 2637  
2638 -* Support new features
2639 -* Fix bugs
2640 -* Change LoRaWAN frequency bands
2641 2641  
2642 -You will need the following things before proceeding:
2643 -
2644 -* 3.5mm programming cable (included with the LT-22222-L as an additional accessory)
2645 -* USB to TTL adapter/converter
2646 -* 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)
2647 -* 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.
2648 -
2649 -{{info}}
2650 -As of this writing, the latest firmware version available for the LT-22222-L is v1.6.1.
2651 -{{/info}}
2652 -
2653 -Below is the hardware setup for uploading a firmware image to the LT-22222-L:
2654 -
2655 -
2656 -
2657 -
2658 -Start the STM32 Flash Loader and choose the correct COM port to update.
2659 -
2660 2660  (((
2661 2661  (((
2662 -(% style="color:blue" %)**For LT-22222-L**(%%):
2663 -
2664 -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.
2665 -)))
2666 -
2667 -
2668 -)))
2669 -
2670 -
2671 -
2672 -
2673 -
2674 -
2675 -
2676 -(% 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:
2677 -
2678 -
2679 -
2680 -(((
2681 -(((
2682 2682  == 6.2 How to change the LoRaWAN frequency band/region? ==
2683 2683  
2684 2684  
... ... @@ -2692,7 +2692,7 @@
2692 2692  (((
2693 2693  
2694 2694  
2695 -== 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? ==
2696 2696  
2697 2697  
2698 2698  )))
... ... @@ -2699,7 +2699,7 @@
2699 2699  
2700 2700  (((
2701 2701  (((
2702 -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.
2703 2703  )))
2704 2704  )))
2705 2705  
... ... @@ -2727,7 +2727,7 @@
2727 2727  
2728 2728  
2729 2729  (((
2730 -(% 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:
2731 2731  
2732 2732  
2733 2733  )))
... ... @@ -2763,6 +2763,7 @@
2763 2763  (% 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:
2764 2764  )))
2765 2765  
2650 +[[image:1653360498588-932.png]]
2766 2766  
2767 2767  
2768 2768  == 6.4 How to change the uplink interval? ==
... ... @@ -2778,16 +2778,11 @@
2778 2778  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.
2779 2779  
2780 2780  
2781 -== 6.6 Can I use point-to-point communication with LT-22222-L? ==
2782 -
2783 -
2784 -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]].
2785 -
2786 2786  
2787 2787  )))
2788 2788  
2789 2789  (((
2790 -== 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? ==
2791 2791  
2792 2792  
2793 2793  * If the device is not properly shut down and is directly powered off.
... ... @@ -2795,23 +2795,19 @@
2795 2795  * In modes 2 to 5, the DO/RO status and pulse count are saved to flash memory.
2796 2796  * After a restart, the status before the power failure will be read from Flash.
2797 2797  
2798 -== 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? ==
2799 2799  
2800 2800  
2801 -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:
2802 2802  
2683 +[[image:image-20221006170630-1.png]]
2803 2803  
2804 2804  
2805 2805  
2806 -== 6.9 Can the LT-22222-L save the RO state? ==
2807 2807  
2688 +== 6.8 Why does the LT-22222-LA always report 15.585V when measuring the AVI? ==
2808 2808  
2809 -To enable this feature, the firmware version must be 1.6.0 or higher.
2810 2810  
2811 -
2812 -== 6.10 Why does the LT-22222-L always report 15.585V when measuring the AVI? ==
2813 -
2814 -
2815 2815  It is likely that the GND is not connected during the measurement, or that the wire connected to the GND is loose.
2816 2816  
2817 2817  
... ... @@ -2860,7 +2860,7 @@
2860 2860  )))
2861 2861  
2862 2862  
2863 -== 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? ==
2864 2864  
2865 2865  
2866 2866  The FCD count of the gateway is inconsistent with the FCD count of the node, causing the downlink to remain in the queue.
... ... @@ -2914,6 +2914,6 @@
2914 2914  = 11. Reference​​​​​ =
2915 2915  
2916 2916  
2917 -* 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]]
2918 2918  * [[Datasheet, Document Base>>https://www.dropbox.com/sh/gxxmgks42tqfr3a/AACEdsj_mqzeoTOXARRlwYZ2a?dl=0]]
2919 2919  * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
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