Troubleshooting guide

Appendix D
SHURE

P4800 System Processor Software Guide Page 105 of 108
APPENDIX D: TROUBLESHOOTING GUIDE___________________
Communication fails between the computer and the P4800:
The following messages are displayed when the P4800 software fails to communicate with the device.
“COM(port) is already in use or does not exist...”
This message appears under the following conditions:
• The specified COM port is already in use by another application.
If the COM port selected is already in use by another application, closing that application will resolve
the problem. An example of an application that keeps the COM port open is HotSync Manager and
similar utilities used for synchronizing the computer with Palm Pilot™ type devices. Closing these
programs might be difficult as they usually run as background applications. Consult the program’s user
manual. Desktop computers usually have more than one physical serial port. In this case, selecting a
different COM port and connecting the serial cable for the P4800 connection to a different serial port
might solve the problem.
• The computer's serial port is disabled.
Run the BIOS setup utility and enable the serial port. When doing so, note the serial port settings (IRQ
and I/O address) and make sure there is a Windows COM port mapped to those settings. Then choose
that COM port in the P4800 software.
“Network not ready...”
This indicates that the P4800 software successfully opened the COM port but did not find a device
connected to it. Make sure the P4800 is powered on and has finished its boot up sequence before
attempting to communicate with the unit. If your computer has more than one COM port, verify you have
connected the network cable to the same COM port that you selected in the "Select COM Port" dialog.
Verify that you are using a standard DB9 serial cable and that it is securely connected to both the
computer and the P4800. Also, make sure that you are connected to the correct port at the device: the
RS232 is the most common port to use.
“No devices detected.”
The P4800 software has found a device other than a P4800 in the selected COM port. This may be a
modem or other serial device, such as a DFR11EQ. Selecting a different COM port to which the P4800
unit is connected will resolve this problem.
P4800 front panel displays a static LED pattern:
The front panel may show a strange LED pattern when the P4800 has an internal error, as in the
following examples:
• The control pin supply current (5 Volt, 100 mA max.) has been exceeded or is shorted to ground –
Remove all control pin connections and cycle power to the device.
• A corrupted scene exists in the device memory, which must be deleted. If the problem persists after
you follow the instructions below, contact Shure’s Applications Group.
To delete corrupted presets:
1. Open the P4800 software and in Design Mode, select File>Delete Preset.
2. Delete any presets that show up as “Corrupted." If the LIVE preset proves to be the offending
preset, click [Cancel].
3. Select File>New to generate a blank scene, then select File>Store Preset and overwrite the
corrupted LIVE preset with the blank scene.