Crestron electronic CP2 Manual De Usuario

2-Series Integrated Control Processor 

 

Crestron CP2/CP2E

Driving the corresponding <pu-disable> signal high can modify this behavior. This is 
not recommended, though, since it will cause the output pin to float when <o> goes 
low. 

Example 1 (recommended):  

The <pu-disable1> signal is driven low or left undefined. When <o1> goes 
low, Versiport 1 is at +5V. When <o1> goes high, Versiport 1 is shorted to 
ground. 

Example 2 (not recommended): 

The <pu-disable1> signal is driven high. When <o1> goes low, Versiport 

1 is floating. When <o1> goes high, Versiport 1 is shorted to ground. 

When a Versiport is operating in digital input mode, the corresponding <i> signal 
will go high whenever the C2I-IO8 detects that the Versiport is shorted to ground 
(threshold < +2.5V).  

NOTE:  Here, as with digital output mode, the corresponding pullup resistor should 
be enabled. That is, <pu-disable> should be given the signal name 0 or left 
undefined; otherwise the input will always read as logic low. 

Example 3:  

When Versiport 3 is shorted to ground, <i3> will go high. When Versiport 3 
is not shorted to ground, <i3> will go low (so long as <pu-disable> equals 
0 or is undefined). 

In analog input mode, the Versiport is typically tied to a resistive load (such as a 
humidity sensor) or a voltage source (both can be represented by box "A" in the 
Versiport diagram). 

When a resistive load is tied to a Versiport, the corresponding pullup resistor must be 
enabled (again, this means that <pu-disable> should be given the signal name 0 or 
left undefined). This creates a voltage divider and provides a varying voltage level, 
based on the current resistance of the sensor for the C2I-IO8 to read. 

Example 4: 

A resistive humidity sensor is tied to Versiport 1 (and <pu-disable1> is low 
or undefined). <i1> will assume the corresponding analog value.  

When a voltage source is tied to a Versiport, the corresponding pullup resistor should 
be disabled (the only case where the default setting should be overridden). This 
allows the C2I-IO8 to read the value of the voltage source directly. 

Example 5:  

A voltage source is tied to Versiport 1 and <pu-disable1> is given the 
signal name 1. <i1> will assume the corresponding analog value (ranging 
from 0 to 65535, or 0 to +10V on the input pin). 

The C2I-IO8 does not propagate all changes in the analog values of its Versiports, 
since this can lead to undesirable results if the input source is not clean or has jitter. 
Rather, the <MinChange> signals should be used to specify a "minimum change" 
value, such that the C2I-IO8 will not propagate the new value until it changes by 
<MinChange>. (The default minimum change value is 2048.) 

Example 6: 

•  2-Series Integrated Control Processor: CP2/CP2E