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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
	328	+(((
326	326	AT+CFGDEV=xx xx xx xx xx xx xx xx xx xx xx xx,
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327	327
	332	+(((
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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1177	1177	)))
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1179	1179	(((
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1180	1180	(% style="color:red" %)Notice: Listening mode can work with the default polling mode of RS485-LN. When RS485-LN is in to send the RS485 commands (from AT+COMMANDx), the listening mode will be interrupt for a while.
1181	1181	)))
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1183	1183
1184	1184	== 3.7 Buttons ==
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1251	1251	)))
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1254	1254	If device already joined network:
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1256	1256	(% class="box infomessage" %)
1257	1257	(((
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1290	1290
1291	1291	(% style="color:red" %)**Note:**
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	1303	+(((
1293	1293	(% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1294	1294	2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1295	1295	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.
1296	1296	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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1298	1298	[[image:1654162478620-421.png]]
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1323	1323	[[image:1654162535040-878.png]]
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	1337	+(((
1325	1325	**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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1327	1327	**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
	1343	+)))
1328	1328
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1329	1329	**Step3: **Open flashloader; choose the correct COM port to update.
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1331	1331	(((
1332	1332	(((
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1333	1333	(% 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.
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1335	1335	)))
	1355	+)))
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1338	1338	[[image:image-20220602175818-12.png]]