AVT MAGIC AD1 ETI, Руководство по оборудованию

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PAGE 38
W i n d o w s P C S o f t w a r e
TTL Pin as Input
FIG. 16 TTL PIN AS INPUT
If you use a TTL Pin as
Input
, you can program two different functions when
the edges change:
•
Positive edge
: The event is triggered when the voltage at the TTL Pin
changes from 0V to +3.3V.
•
Negative edge
: The event is triggered when the voltage at the TTL Pin
changes from +3.3V to 0V.
• The following Function Codes are programmable:
–
-
( Not used): No function, the Pin is not used.
–
Connect
: With this function a connection can be established.
–
Connect (level triggered)
: Same function as above, however, except
that here the level is analyzed and not the edge.
–
Disconnect
: By enabling this function a connection can be discon-
nected.
TIP
With this function, you can configure that the connection is automatically re-
established if there is an unexpected disconnection. Please configure this
function under
Positive edge
. Since the TTL Pin has a 3.3V level by default,
a connection to the given number is established immediately.
Attention: This function can only be ended by setting the Pin to the 0V level
or switching off this function via the configuration.