Keithley PDISO-8 User Manual page 32

3-14
The on-screen digital I/O controller works as follows:
Note:
Channels 0 to 15 refer to the 8-bit general-purpose registers of
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your digital input-output card. (Depending on which card is
used, the number of valid 8-bit registers will vary.) Bits
displayed on the Digital Input Panel and the Digital Output
Panel are numbered 0-7 for every channel. Refer elsewhere in
this manual for a description of the available ports and their
direction.
Invalid channels and settings appear as dark gray squares. For
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example:
Non-existent channels always appear as dark gray squares.
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Channels configured as inputs will appear as dark gray
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squares on the output panel.
Valid channels and settings appear as white squares when OFF
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and green squares when ON. (When the manual is printed in
black and white, valid channels and settings appear as white
squares when OFF and as light gray squares when ON.)
The two-digit numeric displays under Input Bits and Output
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Bits show the hexadecimal values of the adjacent bit patterns.
To configure a valid channel either for input or output, use the
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Digital Channel Configuration Panel. Click on either the
Input or Output square below the channel number. Note: this
selection will be disabled for channels which are fixed as input
or output by hardware design.
To turn ON output-channel bits, use the Digital Output Panel.
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First select the channel number of the bits to be turned on by
clicking on the appropriate square under Channels. Then, turn
ON a bit by clicking the appropriate square under Output Bits.
Turn OFF a bit in the same way.
To read an input-channel bit, use the Digital Input Panel. First
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select the channel number to be checked by clicking the
appropriate square under Channels. Then, read the numbered
bit under Input Bits. OFF input bits appear as black dots and
ON input bits appear as green dots. (When the manual is
printed in black and white, OFF input bits appear as black dots
and ON input bits appear as light gray dots.)
Installation