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43
TTL Pin as input
FIG. 25 TTL PIN AS INPUT
If you use a TTL Pin as Input , you
can configured two different func-
tions
1
when the edges change:
• Positive edge : The event is
triggered when the voltage at the
TTL Pin changes from 0V
to+5V.
• Negative edge : The event is triggered when the voltage at the TTL Pin changes
from +5V to 0V.
The following Function Codes can be selected:
– - (Not used): No function, the Pin is not used. This option is to be selected for re-
mote control via the function Output
→
Remote TTL Input (see page?).
– Call Number : Using this function, a call can be accepted or a connection can be
established with a certain Number . Under Line you select which channel ( 1 or
2 ) is to be used to establish the connection.
– Call Number (level triggered) : Identical function like above, however, only
the level is analysed and not the edge.
– Disconnect : By enabling this function a connection on the indicated line ( 1 or
2 ) can be disconnected.
– Set Information Base Entry : Special function for projects.
– String Command : Special function for projects.
1. Except function code Call Number (level triggered) , if this code is selected only one edge can be used.