5
Operating Manual - PROTEA SYSTEM II 4.24D Distribution / System Processor
4. FRONT PANEL FEATURES
4.1 Input Channels
The 4.24D has four input channels, each of which can be routed to any combination of output channels. Each
input channel's three color Sig LED indicates input signal level of -20dB (green), 0dB (amber), and +20dB clip (red)
respectively. Note that the Sig LEDs detect actual signal at the input connections, before any gain adjustments are
made within the 4.24D. The red input mute LED becomes lit when an input channel is turned off through the use of
software or MIDI control.
4.2 Output Channels
The eight output channels on the 4.24D have three color LEDs to indicate signal, limiter threshold, and clip.
The green signal LED indicates -20dB output level. The amber limiter threshold LED depends on settings established
within Protea System Software, and, assuming the limiter is active, indicates that sufficient signal level has been
reached for the limiter to begin the process of gain reduction. Clipping occurs at +20dB and is indicated by a red LED.
The red output mute LED becomes lit when an output channel is turned off through the use of software or MIDI
control.
4.3 MIDI Channel Indicator
This display indicates the currently assigned MIDI channel (0-16) for the 4.24D. It must match the MIDI
channel selected from the top bar within the 4.24D section of Protea System Software. MIDI channel 0 removes the
device from any MIDI control while still allowing MIDI signal to pass through. This display also indicates the follow-
ing operating conditions within the 4.24D:
- Firmware revision number is displayed during power up, and when a factory reset is aborted.
- Factory reset countdown, which occurs by pressing and holding the MIDI channel select switch during power up.
- Contact closure event confirmation is indicated by an upper case "C" for a few seconds, followed by the active
contact/preset number (1-8), then returning once again to the MIDI channel.
- MIDI / RS-232 preset dump completion is indicated by a lower case "d". If the 4.24D receives a corrupt MIDI
/ RS-232 dump, an upper case "E" is shown.
4.4 MIDI Channel Select Switch
To change the MIDI Channel assignment on the 4.24D, press a paper clip or similar sized object through the
small hole beneath the MIDI channel display until the desired MIDI channel is indicated. This switch is also used to
perform a factory reset by pressing and holding during power up. Note that a factory reset will erase all user defined
presets stored in the 4.24D.
4.5 RS-232 Dataport
The 4.24D has two parallel RS-232 dataports, one on the front panel and one on the back, for connecting to a
computer for software control. See section 6.3 for details on connecting to a computer.
S/L Mute
S/L Mute
S/L Mute
S/L Mute
S/L Mute
S/L Mute
S/L Mute
S/L Mute
Output Channels
Digital Audio Products
SYSTEM II
4. 24D
1
2
3
4
5
6
7
8
