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34	34	|(% style="width:284px" %)[[LTC2>>url:https://www.dragino.com/products/temperature-humidity-sensor/item/170-ltc2.html]]|(% style="width:409px" %)×|(% style="width:204px" %)[[Hardware Connect Photo>>||anchor="H4.1.5LTC2"]]
35	35
36	36
37		-
38	38	= 3. UART Upgrade Guide =
39	39
40	40	== 3.1 Hardware Connection ==
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72	72	* Connect JP2 jumper (Yellow one), so device is power on.
73	73
74	74
75		-
76	76	== 3.2 Upgrade Steps ==
77	77
78	78
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142	142	1. We see a case the FT232 USB TTL adapter has reliability issue with the PC USB chipset(Intel). In this case, even above, it still has serious reliability issue for uploading. If this happen, change a PC or change a USB to TTL adapter will solve.
143	143
144	144
145		-
146	146	== 3.4 Flash Loader ~-~- Unable to Load data from this file ==
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148	148
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188	188
189	189	Connection to LGT92
190	190
191		-* ST-LINK v2 5.0v  <~-~->  Dupont red pin
192		-* ST-LINK v2 GND  <~-~->  Dupont black pin
193		-* ST-LINK v2 SWCLK  <~-~->  Dupont green pin
194		-* ST-LINK v2 SWDIO  <~-~->  Dupont white pin
	188	+* ST-LINK v2 5.0v  <~-~->  Dupont Cable red pin
	189	+* ST-LINK v2 GND  <~-~->  Dupont Cable black pin
	190	+* ST-LINK v2 SWCLK  <~-~->  Dupont Cable green pin
	191	+* ST-LINK v2 SWDIO  <~-~->  Dupont Cable white pin
195	195
196	196
197		-
198	198	=== 4.1.3 LAQ4 ST-Link v2 Connection ===
199	199
200	200
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206	206	=== 4.1.4 RS485-BL/LDDS75/LDDS20/LSE01 ===
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208	208
209		-[[image:image-20220526174733-16.png||height="576" width="903"]]
	205	+[[image:image-20230306115123-4.png]]
210	210
211	211	Connection for RS485-BL base mother board
212	212
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220	220	* ST-LINK (VDD 3.3v,pin19)  <~-~->  ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
221	221
222	222
223		-
224	224	=== 4.1.5 LTC2 ===
225	225
226	226
227		-[[image:image-20220526175131-18.png]]
	222	+[[image:image-20230306112740-2.png]]
228	228
229	229	Connection for LTC2 base mother board
230	230
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235	235	* ST-LINK v2 RESET  <~-~->  LTC2 NRST
236	236	* ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK
237	237	* ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO
	233	+* ST-LINK (VDD 3.3v,pin19)  <~-~->  ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
238	238
239	239
240		-
241	241	== 4.2 ST-Link Upgrade Guide ==
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243	243