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The overdrive protection circuitry operates constantly without being audible under most situations.
If the subwoofer should shut down, reduce the volume setting and shut the subwoofer off until it cools down. The time the subwoofer takes
t
o cool down depends on the ambient room temperature, but typically at least 10 minutes are required for the subwoofer to cool down and
recover from the thermal shutdown.
Also, try plugging the unit into a different wall socket. Overloaded sockets or damaged home wiring circuits can cause power voltage drops
while the subwoofer is drawing high power levels. This condition can result in the subwoofer shutting down intermittently.
230V Users & TV Interface
For 230-volt Digital Drive
P
LUS
subwoofers, the default video mode is NTSC video format. If your TV is NTSC compatible, you will have no
trouble with this mode. However, certain TVs (especially older ones) may require PAL or SECAM video. To switch from NTSC to PAL/SECAM
mode, press the DOWN ARROW four times followed by RESET. The subwoofer will restart in PAL/SECAM video mode. To revert back to
NTSC, restore defaults by pressing 8-9-0 while on the video output Introductory screen.
RS-232 Serial Commands for Controlling Subwoofer
This section describes the RS-232 protocol specification and commands that can be used to control the subwoofer. This protocol indicates
how Digital Drive
P
LUS
subwoofers receive run-time commands from devices such as Crestron
®
products.
The communication protocol uses the standard communication settings for the COM port as shown below.
COM Port Settings
Baud Rate 9600
Data Bits 7 or 8
Parity None
Stop Bits 1
The Digital Drive
PLUS
serial ports use a standard configuration that allows direct connection to a PC via a FEMALE to MALE DB-9
RS-232 serial extension cable. Only three pins are required as shown below.
IN Pin OUT Pin
2 Transmit 2 Receive
3 Receive 3 Transmit
5 Ground 5 Ground
If you are having trouble communicating with your Digital Drive
PLUS
subwoofer, check your serial cable first.
It may be a null modem or “crossover” cable, which won’t work for communicating with the subwoofer
.
Serial commands should be formatted as shown below.
RS-232 SERIAL COMMAND FORMATS
Byte Number
Byte Description Notes
0 ‘#’ Header character
1 to 3 or 1 to 4 Command and 3 to 4 ASCII characters. See the RS-232 Serial Command
Parameter Data table below. These characters must be in CAPS as the
commands are case sensitive.
4 or 5
‘$’
T
ermination character
.
This character is required or command
is ignored.
[ 13 ]
D
igital Drive
P
LUS
U
ser’s Manual
FEATURES
16


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