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7
DC-8 Plus Installation and Operation Manual
OPERATION
Each “STATUS / PAGER ALERT” and BUSY input is provided with two terminals,
a ground terminal labeled “DGND” and input terminal labeled (IN-# / BUSY).
These terminals may be connected to any pair of switch contacts, such as external
relays, switches, open-collector circuits or 5-volt logic signals.
All inputs have the same common. This common is not connected to the power-
main ground since the AC wall transformer is isolated; however, the input common
is internally connected to the circuit ground and the aluminum enclosure of the DC-
8 Plus via a parallel .01 uf cap and 10 ohm resistor. A chassis ground screw is pro-
vided at the rear far right side of the chassis.
Audio connections on the DC-8 Plus are labeled "Out-", "Out +", "In-", "In+", “Aux-“,
“Aux+, DL In and DL Out”. Shields may be tied to the “EGND” terminal. The audio
input is labeled TEL - and TEL + and is active balanced and accepts levels from -10
to +24dbu. The send level may be adjusted from the front panel, while this input may
be turned on and off via touchtone commands.
The balanced output terminals are always active and labeled OUT – and OUT +. The
front panel level control has a range of +4 dbu to OFF.
The balanced Auxiliary input is labeled AUX – and AUX + and feeds the DTMF
decoder directly and may be adjusted by the “AUX” control on the rear panel. The
telephone hybrid null control (R23) is adjusted on the rear panel.
The terminals labeled DL IN and DL OUT are for the user supplied delay unit.
NOTE:
Overloading the send or aux audio inputs, may cause erratic DTMF
operation.
PROGRAMMING AND OPERATION
The Broadcast Tools DC-8 Plus may be operated and programmed either remotely
via telephone, or while the OPERATE/LOCAL switch is depressed. Either way, all
programming and operation is identical. The DC-8 Plus Command Grid and
Programming Commands may be found on pages 9, 10 and 12 of this manual, illus-
trating the programming and operational functions of the DC-8 Plus. Let’s take a
brief run through of the operation of the DC-8 Plus. Using a touch-tone telephone,
dial into the telephone number attached to the DC-8 Plus. After 3 rings, the DC-8
Plus will answer the line and reply with a "BLEEP". Access to the DC-8 Plus status-
monitoring functions are possible after the access code has been entered (Default
access code *1234). If the correct access code has been entered, the DC-8 Plus will
reply with a DOUBLE "BLEEP". To control and monitor to DC-8 Plus the control
must be entered (Default access code **).
NOTE:
The ”MONITORING ” ACCESS CODE is entered as follows: (STAR)
* xxxxxxxx the factory default is *1234
