2 — INSTALLATION SPECIFICATIONS AND WIRING
pg. 19
Return to TOC Curtis Model 1351 – December 2018
Switch (digital) Inputs
e controller oers exibility in conguring the analog/digital inputs as O/On switch signals. All
switch inputs have a pull-down resistor. Some have an additional selectable pull-up resistor, and a
few can be enabled to become oating input (no pull-up with high impedance pull-down resistor).
When the Pull-down is enabled, wire the switch input to connect to B+ when “switched” On. With
the pull-up enabled, the switch can be connected to B− (ground) when “switched” On. When le
oating, the input can be driven by a TTL or voltage device (i.e., not the typical toggle switch). e
control of the pull-up/pull-down resistors state (Pull-Up, Pull-Down or Float) is by the Open State
parameter for each switch when the input is being used as a switch.
In all cases, the input level that is considered ON is set by the Active State parameter.
If Active Level = Low, and input voltage is less than 1V, the State will be On
Alternatively,
If Active Level = High, and input voltage is greater than 4V, the State will be On
Virtual Switches
Analog inputs 1 through 11 are also monitored as virtual digital inputs by comparing high and low
threshold parameters and then applying the Active Level parameter. ese are called Virtual Switch
Inputs. ey are congured using parameters VSW1-11 (virtual switch 1 thru 11). e result is placed
in the VCL variables Virtual_Switch_X (where X is 1 through 11). See Table 8 for the comparison
between Switches and Virtual Switches.
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