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321	321	(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:510px" %)
322	322	|=(% style="width: 110px;" %)**AT Commands**|=(% style="width: 190px;" %)**Description**|=(% style="width: 190px;" %)**Example**
323	323	|AT+CFGDEV|(% style="width:110px" %)(((
	324	+(((
324	324	This command is used to configure the RS485/TTL devices; they won’t be used during sampling.
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325	325
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326	326	AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,
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328	328	mm: 0: no CRC, 1: add CRC-16/MODBUS in the end of this command
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329	329	)))|(% style="width:190px" %)AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,m
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1253	1253	)))
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1256	1256	If device already joined network:
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1258	1258	(% class="box infomessage" %)
1259	1259	(((
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1293	1293	(% style="color:red" %)**Note:**
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1295	1295	(% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1296	1296	2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1297	1297	3. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.
1298	1298	4. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5
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1300	1300	[[image:1654162478620-421.png]]
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1325	1325	[[image:1654162535040-878.png]]
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1327	1327	**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]].
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1329	1329	**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
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1331	1331	**Step3: **Open flashloader; choose the correct COM port to update.
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1333	1333	(((
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1335	1335	(% style="color:blue" %) Hold down the PRO button and then momentarily press the RST reset button and the SYS led will change from OFF to ON, While SYS LED is RED ON, it means the RS485-LN is ready to be program.
1336	1336	)))
1337	1337	)))
	1355	+)))
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1340	1340	[[image:image-20220602175818-12.png]]