E-Lins H750 Series User Manual page 54

 DIO trap: send SNMP trap when DIO changed from 1 to 0, or 0 to 1.
 Set DIo to high for a period of time: If set DIO to high after a period of time, DIO will
goto low automatically, value 0 means disable.
 DIO_0 default value: DIO default value is low(0). if set to high(1), when device is up, it
will be set to high automatically.
 DIO_1 default value: DIO default value is low(0). if set to high(1), when device is up, it
will be set to high automatically.
 DIO_2 default value: DIO default value is low(0). if set to high(1), when device is up, it
will be set to high automatically.
 DIO_3 default value: DIO default value is low(0). if set to high(1), when device is up, it
will be set to high automatically.
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