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C-22
DriverLINX Configuration Notes
You can use the external multiplexer outputs
MUX4-7
as pseudo digital
outputs for applications requiring more than four digital outputs. Since
the channel/gain QRAM controls the state of these outputs, changes to the
state of these lines during active analog input tasks is not pos0sible as it is
for
DO 0-3
. You must output the data for logical channel 1 (MUX port)
before starting an analog input task. The hardware maintains the last
value written to this port until you change it with another task.
The DAS-1800 implements digital hardware Stop Event triggers (
TGIN
)
using a counter/timer to count the number of samples specified for the
Stop Event
Delay.
The value must be greater than zero and is the number
of samples acquired since the Start Event. If you specify a Digital Start
Event and a Digital Stop Event, the Stop Event must be exactly the same
as the Start Event.
DriverLINX implements all digital I/O on the DAS-1800 boards as
immediate, single-value transfers on execution of the Service Request. All
digital I/O is right-justified. DriverLINX ignores unused bits on output
and returns zero on input. Logical Channel 0 Digital Inputs return 4-bit
values.
Digital Input Initialization
Logical Channel 0 is unchanged by initialization.
Digital Output Initialization
Initialization of the Digital Output subsystem resets the value of all
outputs to zero.
Digital I/O Conversion Delay
For Digital I/O on Logical Channel 0, you may use the same clocking
technique as discussed for the analog output subsystem in Interrupt
modes.
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