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W i n d o w s
P C
S o f t w a r e
P A G E 3 8
TTL Pin as Input
FIG. 16
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.
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.
– Disconnect: By enabling this function a connection can be discon-
nected.
TTL PIN AS INPUT
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