Just a comment on the wide range of resistance values the below quote should clear it up
SATEL
VERSA
33
Notes
:
•
The sum of values programmed for the resistors R1 and
R2 may not be lower than 500
Ω
or higher than 15
k
Ω
.
•
In case of the zone expander, it is possible to program the value 0 for the resistor R2. The
2EOL
wiring type
requires that two resistors be used, each having resistance equal to half
the value defined f
or the resistor R1.
•
In the EOL
wiring type
, the resistance value is equal to the sum of values programmed for
the resistors R1 and R2
To put it another way A reading of less than 500 ohms will give a short circuit tamper and a reading of over 15K will give a high resistance tamper.