If a serial terminal is attached to the 3-DRX the operator can program the unit or control
the unit via this terminal. Additionally, the 3-DRX will indicate which output is on line
(Digital 1, Digital 2, or Analog) on the terminal. Upon power up the 3-DRX will display the
following (on the terminal):
Titus Technological Laboratories
3-DRX Automatic Switcher Version 2.00
MENU
1 = Digital 1 *ON LINE*
2 = Digital 2
3 = Analog
4 = Time Delays & Audio Silence (ON)
5 = Sequence # 1
6 = Power up in Auto/Manual set
7 = Modes
8 = EAS Mode (ON)
9 = MUTE (ON)
0 = EXIT Programming
Selecting number 1, 2, or 3 will have the 3-DRX bring up either source 1, 2, or 3.
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If number 4 is selected the following will be displayed:
Digital 1 to Digital 2
TD: 2 sec
Digital 1/2 to Analog
TD: 5 sec
Digital 2 to Digital 1
TD: 7 sec
Analog to Digital 1/2
TD: 10 se
Time Delay For Digital 2
TD: 10 sec
Loss of Audio on Digital inputs 3 min 30 sec
Audio Silence Testing is: ON - Change it? (Y/N)
TD OK? (Y/N)
Audio silence testing should be turned off (“N”) if using it will interfere with normal
operation of the station. Audio silence sensing on the digital inputs is used when a digital
clock may be present from the source but there is no actual audio in the data stream.
This sometimes happens with some inter-city digital links. However, the user should be
aware that the 3-DRX WILL switch to an alternate source if, for example, the announcer
stops talking for the duration of the delay! We suggest that this value be set to a high
time delay to allow for operator error as opposed to equipment failure.
The time delay for switching to an alternate source is then selected. If an error occurs on
an input then the unit will wait for the appropriate time delay and then bring up the next
source in the sequence (selected later). If digital source 2 has a problem it will usually be
skipped in the sequence.
