2-Series Professional Media Controller
Crestron
MC2E
Description
Internal configuration of a Versiport
+5V
2K
pullup1
o1
S1-A
S1-B
A
Used for analog input.
Can be either a voltage
source or resistive load.
VersiPort 1
Digital Output Mode
When a Versiport is operating in digital output mode, the output pin is shorted to
ground on the rising edge of the corresponding <
o
> signal (switch S1-B in the
Versiport diagram is closed). When <
o
> goes low, the output pin is driven to a value
of +5V (switch S1-B is open).
Driving the corresponding <pu-disable> signal high can modify this behavior. This is
not recommended, though, since it causes 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.
Digital Input Mode
When a Versiport is operating in digital input mode, the corresponding <
i
> signal
goes high whenever the C2I-MC2-IO4 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 is always read as logic low.
Example 3:
When Versiport 3 is shorted to ground, <
i3
> goes high. When Versiport 3 is
not shorted to ground, <
i3
> goes low (so long as <
pu-disable
> equals 0 or
is undefined).
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2-Series Professional Media Controller: MC2E
Operations Guide - DOC. 6142
