MM
™
-8802 User Manual
Page 36
http://aa.peavey.com copyright 2001 All Rights Reserved
Software Devices for Control Ports
The external control voltage (CV) and logic ports are integrated devices. In addition to their physical ports, they contain a soft-
ware component that resides within the MediaMatrix
®
application. Now that you have seen how the logic ports are connected
to external devices, you should also understand how the ports are used within the software.
Within MediaMatrix, both the CV input port and the logic output ports have software components that allow for their config-
uration and use. These components can be found in the MM-8802's software control panel (see page 20). In order for these
components to work with actual audio controls, they must be grouped using the Control Grouping functionality within the
MWare
™
application. (Please refer to the MediaMatrix software and its help file for information on Control Grouping.)
The CV input data is displayed in two places. One is a row of
small boxes labeled “CV Inputs” (Refer to Fig. 8). This box dis-
plays the calibrated incoming value based on the voltage present
on the return pin for the port. The range is 0-100. The actual
value read will vary on the tolerance of the device returning the
voltage, the voltage drop across the wire, and how the control is
calibrated. Also located on this control panel is a block labeled “CV Cal”. This block includes additional controls and indica-
tors. These controls display raw input values and allow for calibration for each individual port. (Refer to Fig. 9.)
The row of indicators labeled "Raw Input" displays the exact
input (Raw Input) from the return pin of the CV port. The scale
represents the return of 0-10 Volts in precise hexadecimal steps.
The scale is 0-255, with 255 representing 10 Volts. Use this indi-
cator to see exact, precise increments of the external voltage
return.
Below the raw input indicator are two sets of buttons labeled
"Set Max" and "Set Min". These controls also have an indicator
above them. These controls and their associated indicators are used to calibrate the external control devices. Voltage return
values are always dependent on the loss through the device, the wire and the termination. These controls allow you to compen-
sate for these losses and configure the control to operate properly, over 100% of the usable range (See next page).
LOGIC OUTPUT SOFTWARE CONTROLS
Unlike the CV inputs, the logic outputs do not require calibration. These ports will output a positive DC voltage based on the
simple action of their associated controls. Each control is represented by a simple ON/OFF button in the MM-8802's software
control panel (see page 20). When the button is in its default state of OFF, there is no logic voltage. When the button is ON,
there is a positive DC voltage present on the logic output port. Refer to the illustration below.
Fig. 8, CV Input Values & TTL Logic Output Toggle Buttons
Fig. 9, CV Input Calibration Controls
Fig. 10, TTL Logic Output connections and control buttons.
Ground
OFF
ON
0 VDC
+5VDC
