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Last modified by Kilight Cao on 2025/07/03 15:34
From version 52.1
edited by Kilight Cao
on 2025/07/03 14:56
Change comment: Uploaded new attachment "1653358355238-883.png", version {1}
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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... ... @@ -2409,25 +2409,26 @@
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 +[[image:1653358355238-883.png]]
2421 2421  
2422 2422  
2423 2423  (((
2424 -== 4.2 LT-22222-L related AT commands ==
2425 +== 4.2 LT-22222-LA related AT commands ==
2425 2425  
2426 2426  
2427 2427  )))
2428 2428  
2429 2429  (((
2430 -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.
2431 2431  
2432 2432  * **##AT##+<CMD>?** : Help on <CMD>
2433 2433  * **##AT##+<CMD>** : Run <CMD>
... ... @@ -2524,85 +2524,11 @@
2524 2524  )))
2525 2525  
2526 2526  
2527 -=== 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
2528 -
2529 2529  (((
2530 2530  
2531 -
2532 -(((
2533 -(% style="background-color:#dcdcdc" %)**123456**(%%)  ~/~/ Enter the password to enable AT commands access
2534 2534  )))
2535 -)))
2536 2536  
2537 -(((
2538 -(% style="background-color:#dcdcdc" %)** AT+FDR**(%%)  ~/~/ Reset parameters to Factory Default, Reserve keys
2539 -)))
2540 2540  
2541 -(((
2542 -(% style="background-color:#dcdcdc" %)** 123456**(%%)  ~/~/ Enter the password to enable AT command access
2543 -)))
2544 -
2545 -(((
2546 -(% style="background-color:#dcdcdc" %)** AT+CLASS=C**(%%)  ~/~/ Set to CLASS C mode
2547 -)))
2548 -
2549 -(((
2550 -(% style="background-color:#dcdcdc" %)** AT+NJM=0**(%%)  ~/~/ Set to ABP mode
2551 -)))
2552 -
2553 -(((
2554 -(% style="background-color:#dcdcdc" %) **AT+ADR=0**(%%)  ~/~/ Set the Adaptive Data Rate Off
2555 -)))
2556 -
2557 -(((
2558 -(% style="background-color:#dcdcdc" %)** AT+DR=5**(%%)  ~/~/ Set Data Rate
2559 -)))
2560 -
2561 -(((
2562 -(% style="background-color:#dcdcdc" %)** AT+TDC=60000**(%%)  ~/~/ Set transmit interval to 60 seconds
2563 -)))
2564 -
2565 -(((
2566 -(% style="background-color:#dcdcdc" %)** AT+CHS=868400000**(%%)  ~/~/ Set transmit frequency to 868.4 MHz
2567 -)))
2568 -
2569 -(((
2570 -(% style="background-color:#dcdcdc" %)** AT+RX2FQ=868400000**(%%)  ~/~/ Set RX2 frequency to 868.4 MHz (according to the result from the server)
2571 -)))
2572 -
2573 -(((
2574 -(% style="background-color:#dcdcdc" %)** AT+RX2DR=5**(%%)** ** ~/~/ Set RX2 DR to match the downlink DR from the server. See below.
2575 -)))
2576 -
2577 -(((
2578 -(% 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.
2579 -)))
2580 -
2581 -(((
2582 -(% style="background-color:#dcdcdc" %)** ATZ**         (%%) ~/~/ Reset MCU
2583 -
2584 -
2585 -)))
2586 -
2587 -(((
2588 -(% style="color:red" %)**Note:**
2589 -)))
2590 -
2591 -(((
2592 -**~1. Ensure that the device is set to ABP mode in the LoRaWAN Network Server.**
2593 -
2594 -**2. Verify that the LG01/02 gateway RX frequency matches the AT+CHS setting exactly.**
2595 -
2596 -**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.**
2597 -
2598 -**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.**
2599 -)))
2600 -
2601 -(((
2602 -
2603 -)))
2604 -
2605 -
2606 2606  === 4.2.3 Change to Class A ===
2607 2607  
2608 2608  
... ... @@ -2632,52 +2632,10 @@
2632 2632  == 6.1 How to update the firmware? ==
2633 2633  
2634 2634  
2635 -Dragino frequently releases firmware updates for the LT-22222-L. Updating your LT-22222-L with the latest firmware version helps to:
2636 2636  
2637 -* Support new features
2638 -* Fix bugs
2639 -* Change LoRaWAN frequency bands
2640 2640  
2641 -You will need the following things before proceeding:
2642 -
2643 -* 3.5mm programming cable (included with the LT-22222-L as an additional accessory)
2644 -* USB to TTL adapter/converter
2645 -* 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)
2646 -* 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.
2647 -
2648 -{{info}}
2649 -As of this writing, the latest firmware version available for the LT-22222-L is v1.6.1.
2650 -{{/info}}
2651 -
2652 -Below is the hardware setup for uploading a firmware image to the LT-22222-L:
2653 -
2654 -
2655 -
2656 -
2657 -Start the STM32 Flash Loader and choose the correct COM port to update.
2658 -
2659 2659  (((
2660 2660  (((
2661 -(% style="color:blue" %)**For LT-22222-L**(%%):
2662 -
2663 -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.
2664 -)))
2665 -
2666 -
2667 -)))
2668 -
2669 -
2670 -
2671 -
2672 -
2673 -
2674 -
2675 -(% 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:
2676 -
2677 -
2678 -
2679 -(((
2680 -(((
2681 2681  == 6.2 How to change the LoRaWAN frequency band/region? ==
2682 2682  
2683 2683  
... ... @@ -2691,7 +2691,7 @@
2691 2691  (((
2692 2692  
2693 2693  
2694 -== 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? ==
2695 2695  
2696 2696  
2697 2697  )))
... ... @@ -2698,7 +2698,7 @@
2698 2698  
2699 2699  (((
2700 2700  (((
2701 -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.
2702 2702  )))
2703 2703  )))
2704 2704  
... ... @@ -2726,7 +2726,7 @@
2726 2726  
2727 2727  
2728 2728  (((
2729 -(% 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:
2730 2730  
2731 2731  
2732 2732  )))
... ... @@ -2762,6 +2762,7 @@
2762 2762  (% 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:
2763 2763  )))
2764 2764  
2650 +[[image:1653360498588-932.png]]
2765 2765  
2766 2766  
2767 2767  == 6.4 How to change the uplink interval? ==
... ... @@ -2777,16 +2777,11 @@
2777 2777  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.
2778 2778  
2779 2779  
2780 -== 6.6 Can I use point-to-point communication with LT-22222-L? ==
2781 -
2782 -
2783 -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]].
2784 -
2785 2785  
2786 2786  )))
2787 2787  
2788 2788  (((
2789 -== 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? ==
2790 2790  
2791 2791  
2792 2792  * If the device is not properly shut down and is directly powered off.
... ... @@ -2794,23 +2794,19 @@
2794 2794  * In modes 2 to 5, the DO/RO status and pulse count are saved to flash memory.
2795 2795  * After a restart, the status before the power failure will be read from Flash.
2796 2796  
2797 -== 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? ==
2798 2798  
2799 2799  
2800 -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:
2801 2801  
2683 +[[image:image-20221006170630-1.png]]
2802 2802  
2803 2803  
2804 2804  
2805 -== 6.9 Can the LT-22222-L save the RO state? ==
2806 2806  
2688 +== 6.8 Why does the LT-22222-LA always report 15.585V when measuring the AVI? ==
2807 2807  
2808 -To enable this feature, the firmware version must be 1.6.0 or higher.
2809 2809  
2810 -
2811 -== 6.10 Why does the LT-22222-L always report 15.585V when measuring the AVI? ==
2812 -
2813 -
2814 2814  It is likely that the GND is not connected during the measurement, or that the wire connected to the GND is loose.
2815 2815  
2816 2816  
... ... @@ -2859,7 +2859,7 @@
2859 2859  )))
2860 2860  
2861 2861  
2862 -== 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? ==
2863 2863  
2864 2864  
2865 2865  The FCD count of the gateway is inconsistent with the FCD count of the node, causing the downlink to remain in the queue.
... ... @@ -2913,6 +2913,6 @@
2913 2913  = 11. Reference​​​​​ =
2914 2914  
2915 2915  
2916 -* 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]]
2917 2917  * [[Datasheet, Document Base>>https://www.dropbox.com/sh/gxxmgks42tqfr3a/AACEdsj_mqzeoTOXARRlwYZ2a?dl=0]]
2918 2918  * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
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