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1850	1850	[[RS485 Configure Tool - DRAGINO>>url:http://wiki.dragino.com/xwiki/bin/view/Main/RS485_Configure_Tool/#HTableofContentsFF1A]]
1851	1851
1852	1852
1853		-
1854		-== 6.10 How to determine whether the returned data value FF is valid data or invalid data? ==
1855		-
1856		-The address of the returned data can be used as a flag.
1857		-
1858		-The customer uses the intercept command to intercept the first bit of the returned data (the slave address of the sensor) as a judgment flag.
1859		-
1860		-**Invalid data:**
1861		-
1862		-If the first bit and the data are both FF, it means the data is empty.
1863		-
1864		-
1865		-**Valid data:**
1866		-If the first bit is a normal slave address and the data is FF, it means the data is normal.
1867		-
1868		-
1869	1869	= 7. Trouble Shooting =
1870	1870
1871	1871	== 7.1 Downlink doesn't work, how to solve it? ==