Wheatstone D-8000, Technical Manual

Page: 63 / 169

page 8 – 3
D-8000 / Jan 2003
C P U & D S P M O D U L E S
CPU-8/CPU-8S
The CPU module is the master control module for the D-8000 Digital
Audio Console. By monitoring the various console modules and serial ports,
the CPU controls all of the console audio and logic functions. Because the
system architecture is designed to work by communicating function and
status changes, the D-8000 console is very responsive and fault tolerant. The
console will even continue to pass audio signals with the CPU module
removed; however this module must be present to change levels or channel
assignments.
Both CPU-8 and CPU-8S have several functions and modes that can be
configured by the user. These are normally set to default values at the
factory, and should not be altered casually.
1. The first function is the console ID address. This function is set using
DIP switches SW-2 - SW-3. This address is used to identify the console
serial interface port so that external devices such as automation systems, the
VDip software, and external controllers will communicate with the console
correctly. Because the D-8000 serial interface port can be configured as an
RS-485 device, and multiple consoles can be connected to the same RS-485
bus, each console needs a unique address to identify it properly on the bus,
ensuring that the right commands get passed to the correct console. The
specific address set is unimportant except that any external controller must
use a matching address to communicate with the console. The address is set
with the DIP switches in binary format (for example with all switches “OFF”
the address is “0”, with the first switch “ON”, the address is “1”, with just
the second switch “ON” the address is “2”, with the first and second switches
“ON” the address is “3” and so on). Consult the section “Internal Program-
ming Options”, page 8-9, for more details. The D-8000 console is normally
configured with an address of “1”. Do not change the console address unless
you are using the console in an RS-485 bus system.
2. The second function is serial interface configuration. DIP switches
SW-7 & SW-8 control the serial interface protocol and termination respec-
tively for the two serial ports on the CPU module. These ports can be
configured as RS-232 or RS-485, and terminated or unterminated via these
DIP switches. In particular, COM Ø is designed to be used only with the
optional EQ controller. Again, the default settings of these switches are for
normal operations and should not be changed unless you are using the
console in an RS-485 bus system. Consult the sections “D-8000 Serial
Interface”, page 8-7, and “Internal Programming Options”, page
10-9, for specific configurations. SW-4, position 1, is also used with the
serial interface; by setting it “ON”, the normal checksum in the serial
protocol is disabled. This can be useful with some external control devices
which are not equipped to generate a checksum in their messages.
A momentary push-button switch, SW1, is accessible through a hole in
the front panel to toggle COM1 between RS-232 and RS-485 operation. The
front panel RS-232 LED indicates that the port is in RS-232 mode when lit,
and RS-485 mode when not lit. Upon console power-up, the port will be
configured according to dipswitch SW7 position 2, which should be set for
D-8000 / Jan 2004