ASCO Controls 4449, Rev 1 valid engineering units and channel values

DO Block Valid CHANNEL Values, Block Field Values, and States

DO Output Command

CHANNEL = 1

0 = Close

1 = Open

DI Block: Valid CHANNEL Values, Block Field Values, and States

DI position Readback

CHANNEL = 2

DI Open Indicator

CHANNEL = 3

DI Close Indicator

CHANNEL = 4

0 = Close

0 = Open indicator not active

0 = Close input not active

1 = Open

1 = Open indicator active

1 = Close input active