64-Bit Digital I/O Module with Memory and Counter 10
34980A User’s Guide 269
You can set a channel to output in either active drive or open collector
configurations. When set to ACTive, the module drives the digital lines for
both high and low. The voltage level that represents a logic ‘1’ can be set
using the SOURce:DIGital:LEVel command. Output voltages can range
from 1.66 V (default) to 5 V.
When the channel is set to
OCOLlector, lines are driven low, but set to
high impedance (Hi- Z) when asserted. In the open collector mode, multiple
lines can be connected together by providing external pull- ups.
Once a channel has been configured, write digital data to the channel
using the
SOURce:DIGital:DATA command.
SOUR:DIG:DATA:LWOR 26503,(@1201)
You may also use a hexadecimal format to represent values in the
commands. For example, to send the decimal value of 26503 in hex use
the command form:
SOUR:DIG:DATA:LWOR #h6787,(@1201)
Note that the data should match the channel width configured using
CONFigure:DIGital:DATA:WIDTh command. The data written is masked
by the configured width so that any extra bytes will be discarded.
For example: sending the value 65531 to a byte wide channel will result
in the channel discarding the upper byte and outputting 251.
Channel Width and Polarity, Threshold, Level, and Drive
When the width of a channel is set to WORD or LWORd, the channel
direction (input or output) of the channels spanned by the width is
controlled by the channel in operation. That is, all grouped channels are
automatically set to the same input or output operation.
Channel settings of polarity, threshold, level, and drive mode are
unchanged when channels are combined. For example, consider the
following command sequence.
CONF:DIG:POL NORM,(@1101)
CONF:DIG:POL INV,(@1102)
CONF:DIG:WIDT WORD,(@1101)
NOTE
When using external pull-ups in the open collector mode, the outputs will
not exceed 5 V.
NOTE
Writing to a channel automatically configures the channel as an output.
To Next Page
Loading...
Need help?
General
