Functions of the board
APCI-3504
8.2.2
Current outputs
The analog output channels are set to a 0 mA current value after Power-ON
Reset of the PC.
Fig. 8-4: Switching principle of the analog ground lines
(current version)
8.3
Watchdog
A 12-bit watchdog is available on the APCI-3504 which resets the analog
outputs after running down of its reload value (timeout).
When releasing the watchdog, the reload value is loaded anew after each
setting of the analog outputs (triggering). Triggering can also occur directly
through software command without setting the analog outputs anew.
The operation status can be read back. 3 different clock signals are available
as time base for the watchdog (See 4.4 Limit values).
8.4
Timer
The 12-bit timer is a down counter, which can generate an interrupt after the
reload value has run down (timeout). Through timer, a time base can be
defined independently from the PC clock and synchronise operations for
example.
The status of the counter value, of the reload value and of the status and
interrupt registers can be read back through software.
The operation status can be read back. 3 different clock signals are available
as time base for the watchdog (See 4.4 Limit values).
30
