ASIX AX58200 User Manual page 54

Go to "ESC Access -> Memory" in "Advanced Settings" and check out the address 0x0012.
The firmware will write the user specified Switch ID value into ESC register 0x0012 (the register named
Configured Station Alias).
If you expect that the slave can also use this Switch ID value as second slave address. You just turn on
"Seconds address" bit (bit8 = 1) in ESC register 0x0102 (don't forget click "Write" button).
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GPIO / AIO User Guide
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Figure 8 - 14
Figure 8 - 15
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AX58200