HP 61010A Owner's Manual page 35

Digital i/o
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invalid and the output value field becomes blank. This
indicates that you must now enter a new output value.
NOTE
Just because the output value field becomes blank does not mean
that the output data has changed. It simply means that the
format changes you requested cannot be implemented on the
current output data. These, changes are implemented on the next
data value that you enter into the output value field.
BASE - contains four choices (one is hidden), that allow
you to enter output values into the output field in
decimal, binary, octal, or hexadecimal format. The current
selection is always bright. If the desired base is not bright,
use the arrows at the bottom of the field to move the
desired base to the center location. When the desired base
appears in the center location, point to and select it to
activate that base. The newly selected base will now be
bright to indicate that it is the current selection.
Depending on the base, the legitimate values that you can
enter into the output field are:
Decimal = values from -32768 to +65535
Octal - values from 0 to 177777
Hexadecimal = values from 0 to FFFF
Binary = values from 0000000000000000 to
1111111111111111
.
NOTE
When decimal base is selected, note that values from 0 to 65535
are interpreted as unsigned decimal numbers; values from
-32768 to -l are interpreted as 2's complement decimal
numbers,
Manual Instrument Control
3-11

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