Rievtech xLogic ELC Series User Manual page 279

Variable AM:
You can't change the value of variable AM, it only can be read.
Cursor key:
You can't change the status of cursor key, it only can be read.
Panel key:
You can't change the status of panel key,
it only can be read.
Shift register bit:
You can't change the status of shift register bit, it only can be read.
User Management
User management interface
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