HP E1459A, User Manual

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46 HP E1459A SCPI Command Reference
INPut Subsystem
The INPut Subsystem configures the input de-bounce circuitry and specifies the
input clock source.
Syntax
INPut
n
:CLOCk[:SOURce] < source > page 46
:CLOCk[:SOURce]? page 47
:DEBounce:TIME < time > | MINimum | MAXimum | DEFault page 47
:DEBounce:TIME? [MINimum | MAXimum | DEFault] page 48
INPut
n
:CLOCk[:SOURce] <
source
>
Specifies the input circuitry clock source for Port n.
Parameters
Comments
•
When the clock source is set to INTernal, the input data is sampled by the
internal clock. When the clock is set to EXTernal, the input data is sampled on
negative-edge transitions of the input clock.
•
This is the clock source for clocking new data from the optical isolators into
the input circuitry. New data is automatically clocked into the input debounce
circuitry for each clock pulse of the internal clock when the clock source is
INTernal. Refer to the INPut:DEBounce:TIME command to set the Debounce
time.
•
For a clock source of EXTernal, new data is clocked into the input circuitry
when the external clock receives a clock pulse. Data is clocked into the input
circuitry on the positive edge of the external clock.
•
Note that the debounce circuitry, current value registers, and event detectors
are always clocked by the internal clock.
•
Note: if a Data Available Event is enabled for the port, attempting to set the
clock source to INTernal will result in an error -221, "Settings Conflict".
•
*RST Condition: sets the input clock source to INTernal.
Example
INP1:CLOC:SOUR EXT
Sets the input clock source for Port 1 to
External
Parameter Name Parameter Type Range of Values Default
INPut n
< source >
numeric
discrete
0, 1, 2, 3
INTernal, EXTernal
0
INT