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Operating Manual-4048A digital signal processor
5.3 Contact Closure Connector
There are no user controls on the 4048A, making it ideal for permanent installations where security is an
issue. There may be times, however, where audio system adjustments must be made in response to real time acoustic
changes, such as room size. For these types of changes, the 4048A 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 located 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. Either
momentory or latching switches may be used, where the trigger 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. Each pin number above the contact closure connector
corresponds to the number of the preset which will be recalled when that switch is closed. Always use the 4048A
contact closure ground for contact closure switches. Do not connect the 4048A contact closure ground to any other
external grounds, as ground loop currents may result.
5.4 RS-232 Dataport
The 4048A 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.
5.5 AC Inlet and Power Switch
A detachable AC power cord is used on the 4048A. Since the internal
universal power supply works from 80 to 260 VAC 50-60Hz, the only change
necessary for use with international power is the appropriate AC power cord.
The AC power switch is found on the back of the unit as well.
D-Sub 9 Pin Female
RS-232 Pin-Out
12345
9876
Pin # RS-232 DCE Name
1
2
3
4
5
6
7
8
9
Not Connected
Transmitted Data
Received Data
Data Terminal Read
y
(tied to pin 6)
Ground
Data Set Read
y
(tied to pin 4)
Not Connected
Not Connected
Not Connected