Troubleshooting guide

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Control Pins

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P4800 System Processor Software Guide Page 80 of 108

Gains (Control Input Only)

Gain can be externally controlled by a 100k potentiometer. Directly under any connection block that is

assigned a pot controller is a gain scale, indicated by a blue bar. You can specify the range within which the

pot adjusts the level from –30B to +30dB maximum. The default range is –30dB to 0dB. Figure 53, below

on the left, illustrates the gain mapping checkboxes.

Note: Use a 100K Audio Taper Pot with a tolerance of 5%. The majority of potentiometers have a tolerance

of 10% or 20%. If the open resistance of the pot is below 95K Ohms (greater than -5% tolerance), it

will not raise the signal gain sufficiently. However, you can use a 10% or 20% pot, as long as the

actual resistance value is greater than 95K Ohms.

Pin Configuration

Pin configuration is the second level of external control, and must be established before processor mapping

can be determined. The pin configuration section of the Control Pins window is a software model of the

connections wired to the hardware, which the device requires to properly recognize those connections. You can

store the configuration directly to the device, or save it to PC to be later transmitted to the System Processor.

Note: You must be in Design Mode to create or change the pin configuration.

Creating a New Pin Configuration

1. Go to Design Mode.

2. Select [Devices>Control Pin Configuration] from the main menu.

3. The Control Pins window opens.

4. Select [Control In] or [Logic Out] view.

5. Configure preset control.

a) Enter the number of presets [# Presets] value box.

b) Select an encoding type from the [Encoding Type] pull-down menu.

c) The preset control pins block appears in the pin configuration section of the window.

d) If you are using priority encoding for control input, enter the appropriate preset numbers under the

preset control block (see figure 55 on the following page).

6. Configure any remaining pins for external controllers or logic output by making a selection from the pull-

down menu on the right-hand side of each pin allocation block.

7. Select the [Configuration>Store to Device] menu option.

8. The Select Devices dialog will appear.

9. Select a device and click [OK].

10. The pin configuration is stored to the device.

Figure 53

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Gain Mapping

To edit the gain range adjusted by the pot:

1. Position the cursor anywhere along the scale

and click the left mouse button.

2. The Range Edit dialog appears, as pictured to

the right in figure 54.

3. Enter the appropriate range of gain adjustment

for the connected potentiometer.

4. Click [OK].

5. The new range is indicated by the length of

the blue bar.

ure 54

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Ran

e Edit Dialo