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Last modified by Mengting Qiu on 2025/06/04 18:42
From version 212.1
edited by Dilisi S
on 2024/11/24 01:31
Change comment: Fix uplink interval in dl payload
To version 217.1
edited by Dilisi S
on 2024/11/24 22:28
Change comment: Nov 24 Fix images and few edits

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... ... @@ -969,11 +969,11 @@
969 969  
970 970  ==== 3.4.2.3 Poll an uplink ====
971 971  
972 -Requests an uplink from LT-22222-L.
972 +Requests an uplink from LT-22222-L. The content of the uplink payload varies based on the device's current working mode.
973 973  
974 974  (% style="color:#037691" %)**AT command**
975 975  
976 -There is no AT Command to request an uplink from LT-22222-L
976 +There is no AT Command available for this feature.
977 977  
978 978  (% style="color:#037691" %)**Downlink payload**
979 979  
... ... @@ -981,7 +981,7 @@
981 981  |(% style="width:101px" %)**Payload**|(% style="width:397px" %)<prefix>FF
982 982  |(% style="width:101px" %)**Parameters**|(% style="width:397px" %)**prefix** : 0x08
983 983  |(% style="width:101px" %)**Example**|(% style="width:397px" %)(((
984 -08 FF
984 +08 **FF**
985 985  
986 986  Requests an uplink from LT-22222-L.
987 987  )))
... ... @@ -1015,7 +1015,7 @@
1015 1015  |(% style="width:97px" %)**Parameters**|(% style="width:401px" %)(((
1016 1016  **prefix** : 0x0A 06 (two bytes in hexadecimal)
1017 1017  
1018 -**working mode** : enable (1) or disable (0), represented by 1 byte in hexadecimal.
1018 +**enable/disable trigger_mode** : enable (1) or disable (0), represented by 1 byte in hexadecimal.
1019 1019  )))
1020 1020  |(% style="width:97px" %)**Example**|(% style="width:401px" %)(((
1021 1021  0A 06 **01**
... ... @@ -1029,7 +1029,7 @@
1029 1029  
1030 1030  (% style="color:#037691" %)**AT Command:**
1031 1031  
1032 -There is no AT Command for this feature.
1032 +There is no AT Command available for this feature.
1033 1033  
1034 1034  (% style="color:#037691" %)**Downlink Payload**
1035 1035  
... ... @@ -1169,7 +1169,6 @@
1169 1169  )))
1170 1170  |(% style="width:96px" %)**Example**|(% style="width:402px" %)09 02 **00 00 64**
1171 1171  
1172 -
1173 1173  ==== 3.4.2.9 Trigger – Set AC (current) as a trigger ====
1174 1174  
1175 1175  Sets the current trigger based on the AC port. See also [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
... ... @@ -1351,7 +1351,6 @@
1351 1351  )))
1352 1352  )))
1353 1353  
1354 -
1355 1355  ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1356 1356  
1357 1357  
... ... @@ -1534,17 +1534,10 @@
1534 1534  
1535 1535  When the voltage exceeds the threshold, counting begins. For details, see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1536 1536  
1537 -* (% style="color:#037691" %)**AT Command:**(%%) (% style="color:blue" %)**AT+VOLMAX   ** (%%)~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1538 -
1539 -* (% style="color:#037691" %)**Downlink Payload (prefix 0xA5):**
1540 -
1541 -(% style="color:blue" %)**0xA5 aa bb cc   ** (%%)~/~/ Same as AT+VOLMAX=(aa bb),cc
1542 -
1543 -
1544 1544  (% style="color:#037691" %)**AT Command**
1545 1545  
1546 1546  (% border="2" style="width:500px" %)
1547 -|(% style="width:137px" %)**Command**|(% style="width:361px" %)AT+VOLMAX=<voltage><logic>
1538 +|(% style="width:137px" %)**Command**|(% style="width:361px" %)AT+VOLMAX=<voltage>,<logic>
1548 1548  |(% style="width:137px" %)**Response**|(% style="width:361px" %)
1549 1549  |(% style="width:137px" %)**Parameters**|(% style="width:361px" %)(((
1550 1550  **voltage** : voltage threshold in mV
... ... @@ -1551,9 +1551,9 @@
1551 1551  
1552 1552  **logic**:
1553 1553  
1554 -0 : lower than
1545 +**0** : lower than
1555 1555  
1556 -1: higher than
1547 +**1**: higher than
1557 1557  
1558 1558  if you leave logic parameter blank, it is considered 0
1559 1559  )))
... ... @@ -1582,9 +1582,9 @@
1582 1582  
1583 1583  **logic**: (1 byte in hexadecimal)
1584 1584  
1585 -0 : lower than
1576 +**0** : lower than
1586 1586  
1587 -1: higher than
1578 +**1**: higher than
1588 1588  
1589 1589  if you leave logic parameter blank, it is considered 1 (higher than)
1590 1590  )))
... ... @@ -1606,22 +1606,10 @@
1606 1606  
1607 1607  This command allows users to pre-configure specific count numbers for various counting parameters such as Count1, Count2, or AVI1 Count. Use the AT command to set the desired count number for each configuration.
1608 1608  
1609 -* (% style="color:#037691" %)**AT Command:**(%%) (% style="color:blue" %)**AT+SETCNT=aa,(bb cc dd ee) **
1610 -
1611 -(% style="color:red" %)**aa:**(%%) 1: Set count1; 2: Set count2; 3: Set AV1 count
1612 -
1613 -(% style="color:red" %)**bb cc dd ee: **(%%)The number to be set
1614 -
1615 -
1616 -* (% style="color:#037691" %)**Downlink Payload (prefix 0xA8):**
1617 -
1618 -(% style="color:blue" %)**0x A8 aa bb cc dd ee     ** (%%)~/~/ same as AT+SETCNT=aa,(bb cc dd ee)
1619 -
1620 -
1621 1621  (% style="color:#037691" %)**AT Command**
1622 1622  
1623 1623  (% border="2" style="width:500px" %)
1624 -|(% style="width:134px" %)**Command**|(% style="width:364px" %)AT+SETCNT=<counting_parameter><number>
1603 +|(% style="width:134px" %)**Command**|(% style="width:364px" %)AT+SETCNT=<counting_parameter>,<number>
1625 1625  |(% style="width:134px" %)**Response**|(% style="width:364px" %)
1626 1626  |(% style="width:134px" %)**Parameters**|(% style="width:364px" %)(((
1627 1627  **counting_parameter** :
... ... @@ -1667,12 +1667,6 @@
1667 1667  
1668 1668  This command clears the counting in counting mode.
1669 1669  
1670 -* (% style="color:#037691" %)**AT Command:**(%%) (% style="color:blue" %)**AT+CLRCOUNT         **(%%) ~/~/ clear all counting
1671 -
1672 -* (% style="color:#037691" %)**Downlink Payload (prefix 0xA6):**
1673 -
1674 -(% style="color:blue" %)**0x A6 01    ** (%%)~/~/ clear all counting
1675 -
1676 1676  (% style="color:#037691" %)**AT Command**
1677 1677  
1678 1678  (% border="2" style="width:500px" %)
... ... @@ -1694,20 +1694,6 @@
1694 1694  
1695 1695  This command allows you to configure the device to save its counting result to internal flash memory at specified intervals. By setting a save time, the device will periodically store the counting data to prevent loss in case of power failure. The save interval can be adjusted to suit your requirements, with a minimum value of 30 seconds.
1696 1696  
1697 -* (% style="color:#037691" %)**AT Command:**
1698 -
1699 -(% style="color:blue" %)**AT+COUTIME=60  **(%%)~/~/ Sets the save time to 60 seconds. The device will save the counting result in internal flash every 60 seconds. (Min value: 30 seconds)
1700 -
1701 -
1702 -* (% style="color:#037691" %)**Downlink Payload (prefix 0xA7):**
1703 -
1704 -(% style="color:blue" %)**0x A7 aa bb cc     ** (%%)~/~/ same as AT+COUTIME =aa bb cc,
1705 -
1706 -(((
1707 -Range: aa bb cc:0 to 16777215,  (unit: seconds)
1708 -)))
1709 -
1710 -
1711 1711  (% style="color:#037691" %)**AT Command**
1712 1712  
1713 1713  (% border="2" style="width:500px" %)
... ... @@ -1739,18 +1739,8 @@
1739 1739  
1740 1740  This command allows you to reset the saved relay output (RO) and digital output (DO) states when the device joins the network. By configuring this setting, you can control whether the device should retain or reset the relay states after a reset and rejoin to the network.
1741 1741  
1742 -* (% style="color:#037691" %)**AT Command:**
1701 +(% style="color:#037691" %)**AT Command**
1743 1743  
1744 -(% style="color:blue" %)**AT+RODORESET=1    **(%%)~/~/ RODO will close when the device joining the network. (default)
1745 -
1746 -(% style="color:blue" %)**AT+RODORESET=0    **(%%)~/~/ After the device is reset, the previously saved RODO state (only MOD2 to MOD5) is read, and its state will not change when the device reconnects to the network.
1747 -
1748 -
1749 -* (% style="color:#037691" %)**Downlink Payload (prefix 0xAD):**
1750 -
1751 -(% style="color:blue" %)**0x AD aa      ** (%%)~/~/ same as AT+RODORET =aa
1752 -
1753 -
1754 1754  (% border="2" style="width:500px" %)
1755 1755  |(% style="width:127px" %)**Command**|(% style="width:371px" %)AT+RODORESET=<state>
1756 1756  |(% style="width:127px" %)**Response**|(% style="width:371px" %)
... ... @@ -1771,6 +1771,8 @@
1771 1771  After the device is reset, the previously saved RODO state (limited to MOD2 to MOD5) is read, and it will not change when the device reconnects to the network.
1772 1772  )))
1773 1773  
1723 +(% style="color:#037691" %)**Downlink Payload**
1724 +
1774 1774  (% border="2" style="width:500px" %)
1775 1775  |(% style="width:127px" %)**Payload**|(% style="width:371px" %)<prefix><state>
1776 1776  |(% style="width:127px" %)**Parameters**|(% style="width:371px" %)(((
... ... @@ -1796,22 +1796,17 @@
1796 1796  
1797 1797  This command allows you to configure whether the device should upload data in an encrypted format or in plaintext. By default, the device encrypts the payload before uploading. You can toggle this setting to either upload encrypted data or transmit it without encryption.
1798 1798  
1799 -* (% style="color:#037691" %)**AT Command:**
1750 +(% style="color:#037691" %)**AT Command:**
1800 1800  
1801 -(% style="color:blue" %)**AT+DECRYPT=1  ** (%%)~/~/ The payload is uploaded without encryption
1802 -
1803 -(% style="color:blue" %)**AT+DECRYPT=0    **(%%)~/~/  Encrypt when uploading payload (default)
1804 -
1805 -
1806 1806  (% border="2" style="width:500px" %)
1807 1807  |(% style="width:127px" %)**Command**|(% style="width:371px" %)AT+DECRYPT=<state>
1808 1808  |(% style="width:127px" %)**Response**|(% style="width:371px" %)
1809 1809  |(% style="width:127px" %)**Parameters**|(% style="width:371px" %)(((
1810 -state :
1756 +**state** :
1811 1811  
1812 -1 : The payload is uploaded without encryption
1758 +**1** : The payload is uploaded without encryption
1813 1813  
1814 -0 : The payload is encrypted when uploaded (default)
1760 +**0** : The payload is encrypted when uploaded (default)
1815 1815  )))
1816 1816  |(% style="width:127px" %)**Example**|(% style="width:371px" %)(((
1817 1817  AT+DECRYPT=1
... ... @@ -1830,13 +1830,8 @@
1830 1830  
1831 1831  This command allows you to retrieve and optionally uplink sensor readings through the serial port.
1832 1832  
1833 -* (% style="color:#037691" %)**AT Command:**
1779 +(% style="color:#037691" %)**AT Command**
1834 1834  
1835 -(% style="color:blue" %)**AT+GETSENSORVALUE=0    **(%%)~/~/ The serial port retrieves the reading of the current sensor.
1836 -
1837 -(% style="color:blue" %)**AT+GETSENSORVALUE=1    **(%%)~/~/ The serial port retrieves the current sensor reading and uploads it.
1838 -
1839 -
1840 1840  (% border="2" style="width:500px" %)
1841 1841  |(% style="width:127px" %)**Command**|(% style="width:371px" %)AT+GETSENSORVALUE=<state>
1842 1842  |(% style="width:127px" %)**Response**|(% style="width:371px" %)
... ... @@ -1864,13 +1864,8 @@
1864 1864  
1865 1865  This command manages how the node handles mismatched downlink packet counts. It offers two modes: one disables the reception of further downlink packets if discrepancies occur, while the other resets the downlink packet count to align with the server, ensuring continued communication.
1866 1866  
1867 -* (% style="color:#037691" %)**AT Command:**
1808 +(% style="color:#037691" %)**AT Command**
1868 1868  
1869 -(% style="color:blue" %)**AT+DISFCNTCHECK=0   **(%%)~/~/ When the downlink packet count sent by the server is less than the node downlink packet count or exceeds 16384, the node will no longer receive downlink packets (default)
1870 -
1871 -(% style="color:blue" %)**AT+DISFCNTCHECK=1   **(%%)~/~/ When the downlink packet count sent by the server is less than the node downlink packet count or exceeds 16384, the node resets the downlink packet count and keeps it consistent with the server downlink packet count.
1872 -
1873 -
1874 1874  (% border="2" style="width:500px" %)
1875 1875  |(% style="width:130px" %)**Command**|(% style="width:368px" %)AT+DISFCNTCHECK=<state>
1876 1876  |(% style="width:130px" %)**Response**|(% style="width:368px" %)(((
... ... @@ -1902,17 +1902,6 @@
1902 1902  
1903 1903  This command controls the behavior of the node when the combined size of the MAC commands (MACANS) from the server and the payload exceeds the allowed byte limit for the current data rate (DR). The command provides two modes: one enables splitting the data into batches to ensure compliance with the byte limit, while the other prioritizes the payload and ignores the MACANS in cases of overflow.
1904 1904  
1905 -* (% style="color:#037691" %)**AT Command:**
1906 -
1907 -(% style="color:blue" %)**AT+DISMACANS=0**   (%%) ~/~/ When the MACANS of the reply server plus the payload exceeds the maximum number of bytes of 11 bytes (DR0 of US915, DR2 of AS923, DR2 of AU195), the node will send a packet with a payload of 00 and a port of 4. (default)
1908 -
1909 -(% style="color:blue" %)**AT+DISMACANS=1**  (%%) ~/~/ When the MACANS of the reply server plus the payload exceeds the maximum number of bytes of the DR, the node will ignore the MACANS and not reply, and only upload the payload part.
1910 -
1911 -
1912 -* (% style="color:#037691" %)**Downlink Payload **(%%)**:**
1913 -
1914 -(% style="color:blue" %)**0x21 00 01 ** (%%) ~/~/ Set  the DISMACANS=1
1915 -
1916 1916  (% style="color:#037691" %)**AT Command**
1917 1917  
1918 1918  (% border="2" style="width:500px" %)
... ... @@ -2140,7 +2140,7 @@
2140 2140  === 3.6.1 Digital Input Ports: DI1/DI2/DI3 (For LT-33222-L, Low Active) ===
2141 2141  
2142 2142  
2143 -Supports NPN-type sensors.
2068 +Supports** NPN-type **sensors.
2144 2144  
2145 2145  [[image:1653356991268-289.png]]
2146 2146  
... ... @@ -2262,15 +2262,15 @@
2262 2262  )))
2263 2263  
2264 2264  
2265 -(% style="color:blue" %)**Example4**(%%): Connecting to Dry Contact sensor
2190 +(% style="color:blue" %)**Example 4**(%%): Connecting to a Dry Contact sensor
2266 2266  
2267 -From the DI port circuit above, you can see that activating the photocoupler requires a voltage difference between the DI+ and DI- ports. However, the Dry Contact sensor is a passive component and cannot provide this voltage difference.
2192 +From the DI port circuit above, activating the photocoupler requires a voltage difference between the DI+ and DI- ports. However, the Dry Contact sensor is a passive component and cannot provide this voltage difference on its own.
2268 2268  
2269 -To detect a Dry Contact, you can supply a power source to one pin of the Dry Contact. Below is a reference circuit diagram.
2194 +To detect a Dry Contact, you can supply a power source to one of the pins of the Dry Contact. A reference circuit diagram is shown below.
2270 2270  
2271 2271  [[image:image-20230616235145-1.png]]
2272 2272  
2273 -(% style="color:blue" %)**Example5**(%%): Connecting to an Open Collector
2198 +(% style="color:blue" %)**Example 5**(%%): Connecting to an Open Collector
2274 2274  
2275 2275  [[image:image-20240219115718-1.png]]
2276 2276  
... ... @@ -2346,7 +2346,7 @@
2346 2346  [[image:image-20220524100215-10.png||height="382" width="723"]]
2347 2347  
2348 2348  
2349 -== 3.7 LEDs Indicators ==
2274 +== 3.7 LED Indicators ==
2350 2350  
2351 2351  The table below lists the behavior of LED indicators for each port function.
2352 2352  
... ... @@ -2385,13 +2385,14 @@
2385 2385  == 4.1 Connecting the LT-22222-L to a PC ==
2386 2386  
2387 2387  (((
2388 -You can use a USB-to-TTL adapter along with a 3.5mm Program Cable to connect the LT-22222-L to a PC, as shown below.
2313 +You can use a USB-to-TTL adapter/converter along with a 3.5mm Program Cable to connect the LT-22222-L to a PC, as shown below.
2389 2389  
2390 -[[image:usb-ttl-programming.png]]
2315 +[[image:usb-ttl-audio-jack-connection.jpg]]
2316 +
2317 +
2391 2391  )))
2392 2392  
2393 2393  
2394 -
2395 2395  (((
2396 2396  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:
2397 2397  )))
... ... @@ -2421,39 +2421,39 @@
2421 2421  * **##AT+APPSKEY##**: Get or set the Application Session Key (AppSKey)
2422 2422  * **##AT+APPEUI##**: Get or set the Application EUI (AppEUI)
2423 2423  * **##AT+ADR##**: Get or set the Adaptive Data Rate setting. (0: OFF, 1: ON)
2424 -* AT+TXP: Get or set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Specification)
2425 -* AT+DR:  Get or set the Data Rate. (0-7 corresponding to DR_X)  
2426 -* AT+DCS: Get or set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
2427 -* AT+PNM: Get or set the public network mode. (0: off, 1: on)
2428 -* AT+RX2FQ: Get or set the Rx2 window frequency
2429 -* AT+RX2DR: Get or set the Rx2 window data rate (0-7 corresponding to DR_X)
2430 -* AT+RX1DL: Get or set the delay between the end of the Tx and the Rx Window 1 in ms
2431 -* AT+RX2DL: Get or set the delay between the end of the Tx and the Rx Window 2 in ms
2432 -* AT+JN1DL: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
2433 -* AT+JN2DL: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
2434 -* AT+NJM: Get or set the Network Join Mode. (0: ABP, 1: OTAA)
2435 -* AT+NWKID: Get or set the Network ID
2436 -* AT+FCU: Get or set the Frame Counter Uplink (FCntUp)
2437 -* AT+FCD: Get or set the Frame Counter Downlink (FCntDown)
2438 -* AT+CLASS: Get or set the Device Class
2439 -* AT+JOIN: Join network
2440 -* AT+NJS: Get OTAA Join Status
2441 -* AT+SENDB: Send hexadecimal data along with the application port
2442 -* AT+SEND: Send text data along with the application port
2443 -* AT+RECVB: Print last received data in binary format (with hexadecimal values)
2444 -* AT+RECV: Print last received data in raw format
2445 -* AT+VER: Get current image version and Frequency Band
2446 -* AT+CFM: Get or Set the confirmation mode (0-1)
2447 -* AT+CFS: Get confirmation status of the last AT+SEND (0-1)
2448 -* AT+SNR: Get the SNR of the last received packet
2449 -* AT+RSSI: Get the RSSI of the last received packet
2450 -* AT+TDC: Get or set the application data transmission interval in ms
2451 -* AT+PORT: Get or set the application port
2452 -* AT+DISAT: Disable AT commands
2453 -* AT+PWORD: Set password, max 9 digits
2454 -* AT+CHS: Get or set the Frequency (Unit: Hz) for Single Channel Mode
2455 -* AT+CHE: Get or set eight channels mode, Only for US915, AU915, CN470
2456 -* AT+CFG: Print all settings
2350 +* ##**AT+TXP**##: Get or set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Specification)
2351 +* **##AT+DR##**:  Get or set the Data Rate. (0-7 corresponding to DR_X)  
2352 +* **##AT+DCS##**: Get or set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
2353 +* ##**AT+PNM**##: Get or set the public network mode. (0: off, 1: on)
2354 +* ##**AT+RX2FQ**##: Get or set the Rx2 window frequency
2355 +* ##**AT+RX2DR**##: Get or set the Rx2 window data rate (0-7 corresponding to DR_X)
2356 +* ##**AT+RX1DL**##: Get or set the delay between the end of the Tx and the Rx Window 1 in ms
2357 +* ##**AT+RX2DL**##: Get or set the delay between the end of the Tx and the Rx Window 2 in ms
2358 +* ##**AT+JN1DL**##: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
2359 +* ##**AT+JN2DL**##: Get or set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
2360 +* ##**AT+NJM**##: Get or set the Network Join Mode. (0: ABP, 1: OTAA)
2361 +* ##**AT+NWKID**##: Get or set the Network ID
2362 +* ##**AT+FCU**##: Get or set the Frame Counter Uplink (FCntUp)
2363 +* ##**AT+FCD**##: Get or set the Frame Counter Downlink (FCntDown)
2364 +* ##**AT+CLASS**##: Get or set the Device Class
2365 +* ##**AT+JOIN**##: Join network
2366 +* ##**AT+NJS**##: Get OTAA Join Status
2367 +* ##**AT+SENDB**##: Send hexadecimal data along with the application port
2368 +* ##**AT+SEND**##: Send text data along with the application port
2369 +* ##**AT+RECVB**##: Print last received data in binary format (with hexadecimal values)
2370 +* ##**AT+RECV**##: Print last received data in raw format
2371 +* ##**AT+VER**##: Get current image version and Frequency Band
2372 +* ##**AT+CFM**##: Get or Set the confirmation mode (0-1)
2373 +* ##**AT+CFS**##: Get confirmation status of the last AT+SEND (0-1)
2374 +* ##**AT+SNR**##: Get the SNR of the last received packet
2375 +* ##**AT+RSSI**##: Get the RSSI of the last received packet
2376 +* ##**AT+TDC**##: Get or set the application data transmission interval in ms
2377 +* ##**AT+PORT**##: Get or set the application port
2378 +* ##**AT+DISAT**##: Disable AT commands
2379 +* ##**AT+PWORD**##: Set password, max 9 digits
2380 +* ##**AT+CHS**##: Get or set the Frequency (Unit: Hz) for Single Channel Mode
2381 +* ##**AT+CHE**##: Get or set eight channels mode, Only for US915, AU915, CN470
2382 +* ##**AT+CFG**##: Print all settings
2457 2457  )))
2458 2458  
2459 2459  
... ... @@ -2618,7 +2618,7 @@
2618 2618  You will need the following things before proceeding:
2619 2619  
2620 2620  * 3.5mm programming cable (included with the LT-22222-L as an additional accessory)
2621 -* USB to TTL adapter
2547 +* USB to TTL adapter/converter
2622 2622  * 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)
2623 2623  * 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.
2624 2624  
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2628 2628  
2629 2629  Below is the hardware setup for uploading a firmware image to the LT-22222-L:
2630 2630  
2631 -[[image:usb-ttl-programming.png]]
2557 +[[image:usb-ttl-audio-jack-connection.jpg]]
2632 2632  
2633 2633  
2634 2634  
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