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1336	1336
1337	1337	[[image:1653358238933-385.png]]
1338	1338
1339		-(((
1340	1340	In PC, User needs to set (% style="color:#4f81bd" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console for LT. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**)(%%) to active it. As shown below:
1341		-)))
1342	1342
1343	1343	[[image:1653358355238-883.png]]
1344	1344
...	...	@@ -1660,13 +1660,11 @@
1660	1660	Below shows the hardware connection for how to upload an image to the LT:
1661	1661	* [[image:1653359603330-121.png]]
1662	1662
1663		-(((
1664	1664	**Step1:** Download [[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]].
1665	1665	**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1666	1666	**Step3: **Open flashloader; choose the correct COM port to update.
1667	1667	**For LT-22222-L**:
1668	1668	Hold down the PRO button and then momentarily press the RST reset button and the **DO1 led** will change from OFF to ON. When **DO1 LED** is on, it means the device is in download mode.
1669		-)))
1670	1670
1671	1671	[[image:image-20220524103407-12.png]]
1672	1672
...	...	@@ -1712,15 +1712,10 @@
1712	1712	[[image:1653360231087-571.png||height="401" width="727"]]
1713	1713	)))
1714	1714
1715		-(((
1716	1716	(% style="color:red" %)Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by TTN.
1717		-)))
1718	1718
1719		-(((
1720	1720	(% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1721		-)))
1722	1722
1723		-(((
1724	1724	(% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1725	1725	(% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1726	1726	(% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
...	...	@@ -1731,11 +1731,8 @@
1731	1731	(% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1732	1732	(% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1733	1733	(% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1734		-)))
1735	1735
1736		-(((
1737	1737	As shown in below:
1738		-)))
1739	1739
1740	1740	[[image:1653360498588-932.png||height="485" width="726"]]
1741	1741