BEWATOR COTAG 4101-2 - Configuring Inputs

4101-2 Controller Installation Handbook
7-4
The following diagram shows which of the four possible conditions of
a supervised input (open circuit tamper, input high, input low, short
circuit tamper) will be generated by any applied voltage.
123
1
2
3
1
2
3
1
2
3
1
2
3
123
123
1
2
3
1
2
3
123
123
1
2
3
1
2
3
1
2
3
123
123
123
123
123
123
123
VA (10V + 0.5V)
0V
9.1V
( + 0.5V*)
5.7V
2.1V
( + 0.4V*)
( + 0.3V*)
Open circuit
tamper
Input
high
Input
low
Short circuit
tamper
*
The tolerances shown are entirely due to the + 0.5V tolerance in VA.
For example, if VA were 9.5V, the open circuit tamper condition
boundary would be reduced proportionately, but an input high
condition would still be guaranteed at 8.6V.
Each input has an internal 1k5 pull-up resistor to VA.
Note that you must never drive the input with a voltage which is
greater than VA - physical damage will occur.
If the input is configured as a normal (non-supervised) input, the
5.7V boundary alone determines the state of the input.
Configuring inputs
Inputs can be configured in a number of ways using the Software.
For example, an input can be shunted (meaning that its state is
ignored) during certain times.