7
Operating Manual - PROTEA SYSTEM II 4.24D Distribution / System Processor
5.4 Contact Closure Connector
There are no user controls on the 4.24D, making it ideal for permanent installations where security is an issue.
There may be times, however, where real time variables require changes in system settings, such as EQ, gain, and
delay settings changing when a room size changes. For these types of changes, the 4.24D offers the ability to recall up
to eight different presets using contact closures. Contact closures are nothing more than external, user installed
switches that, when closed, recall a previously defined preset which at once applies changes to the settings of all inputs
and outputs. The switches can be anything from a rotary switch on a control room panel, to automatic door sensors
scattered throughout a conference center, to a microphone key switch, etc. Contact closures allow for flexibility while
maintaining a high degree of system security.
To use contact closure switching, up to eight presets (1-8) must first be defined according to the needs of the
installation. Switches are to be configured so that closing the switch contact triggers the preset recall event. It doesn't
matter if the switch is momentary or latching, the only thing that triggers the event is the transition from open to closed
for a given circuit. Closing a circuit will automatically override any previously recalled presets. Up to eight switches
can be used, with all switches sharing a common ground connection. The number above the nine pin Euro Block
contact closure connector equals the number of the preset which will be recalled when that switch is closed. Always
use the 4.24D contact closure ground for contact closure switches. Do not connect the 4.24D contact closure ground
to any other external grounds, as ground loop currents may result.
5.5 Data In and Data Out Connection
The Data In and Out connectors are used for any MIDI formatted messages, includ-
ing connecting to other Protea products under software control. Protea System Software is
usually required to operate the 4.24D from a Windows based personal computer. The ex-
ception is when using SIA, Crestron, or some other third party controller. In any case,
control data for the 4.24D uses the MIDI or RS-232 protocol. Most computers have an RS-
232 port available, or can use MIDI through a MIDI card or joy stick controller adapter.
Some third party hardware controllers may use only MIDI.
5.6 AC Inlet and Power Switch
A detachable AC power cord is used on the 4.24D. Since the internal universal power supply works from 80 to
260 VAC 50-60Hz, the only change necessary for use in foreign environments is the appropriate AC power cord. The
AC power switch is found on the back of the unit as well.
5.7 RS-232 Mode Switch
The RS-232 mode switch is pushed in only when the 4.24D RS-232 Dataport is connected to a PC, and is the
first of several Protea products in a MIDI chain.
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Pin # Function
1
2
3
4
5
NC
Out & Thru - Ground, In - NC
NC
Data +5V
Data Signal
MIDI Pin-Out
1
3
4
2
5
Standard Mode
Multiple Slave Mode
(1st Unit Only)
RS-232
Data Out
Ashly Audio Inc.
Made In USA
4. 24D
80-240VAC 50-60Hz 20W
On
AC
1/4A Max
Risk of Electric
Shock. Do
Not Open
CAUTION
Data In
Gnd 1 2 3 4 5 6 7 8
Output.
8
G G (+) (-)
8
RS-232 Dataport
Contact Closure
