C-18
DriverLINX Configuration Notes
Although both SRs share the same clock source, they are otherwise
logically independent of each other. Your application must manage and
respond to each Service Request separately. If the AI task terminates
before the AO task, the AO task will still be logically active, but the clock
will be send timing pulses to the AO task until the next AI task starts. If
you want to terminate the AO task when the AI task stops, either set up
both SRs with equal buffer sizes and Stop Events, or issue a Stop
operation request for the AO task.
External Clocking
Specify external clocking using a Rate Timing Event on channel 0 with an
external clock source specified. For hardware-independence, you can
specify the hardware external trigger channel by the symbolic constant,
DI_EXTCLK
. Connect the external clock source to
DI 0/XPCLK
[B39]
for DAS-1800HC or
XPCLK
[44] for other DAS-1800 models. The
hardware external clocking feature of the DAS-1800 supports positive or
negative active edge clocking. Note that the DAS-1800HC models use
DI 0/XPCLK
for both external clocking and digital input. BE SURE that
external clock source is TTL compatible, 0V minimum to +5V
maximum!
External Triggering
Specify external triggering using a Digital Start Event reading from the
digital input port (channel 0) or external trigger input (channel 2). For
hardware-independence, you can specify the hardware external trigger
channel by the symbolic constant,
DI_EXTTRG
. Digital Start Events
contain
mask
,
pattern
, and
match
fields. The mask is logically AND with
the digital input data on the Logical Channel and then compared against
the
pattern
for a match/mismatch. DriverLINX will use hardware
triggering if the Digital Start Event corresponds to a positive or negative
edge at input port line,
DI 1/TGIN
[B40] for DAS-1800HC and
TGIN
[46] for other DAS-1800 models. During an AO task running in the
recycle mode, if Simultaneous = TRUE, and the Start Event is a hardware
Digital Input trigger, the DI event will restart the FIFO pointer to
beginning.
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