Studio Technologies 47 - Manual (Page 26)

Issue 1, August 2010 Model 47 User Guide
Page 26 Studio Technologies, Inc.
circuits to generate a very impolite noise.
This condition, caused by the 2-wire out-
put circuitry being in an “unloaded” state,
will not damage the Model 47’s circuitry.
But errors in cable “patching,” a discon-
nected cable, or other real-world issues
can lead listeners of the Model 47’s 4-wire
outputs from being presented with a rude
surprise!
In conclusion, it’s important that technical
personnel working with the Model 47 be
informed when the auto termination func-
tion has been disabled. They will then be
aware of the potential noise issues and be
ready to make corrections should a prob-
lem arise.
Factory Test
Back-panel DIP switch 4 allows a factory
test mode to be enabled. During normal
operation DIP switch 4 should remain in
its off (down) position. When DIP switch
4 is in its on (up) position factory mode
is active (enabled). Enabling this mode
will result in the following operating con-
dition: during an auto null sequence the
associated 4-wire output channel will
remain active. This will allow the tones
associated with the nulling process to be
present on the 4-wire output. While not
appropriate during actual Model 47 use, it
is interesting to “hear” the nulling process
take place. But unless directed by factory
personnel DIP switch 4 should remain in
its off (down) position.
Technical Notes
Software Version Display
A special Model 47 power-up sequence
allows the unit’s software version number
to be displayed. This is useful when work-
ing with factory personnel on application
support and troubleshooting situations.
The four status LEDs associated with
interface 1 are used to display the major
release number with a range of 1 through
4. The four status LEDs associated with
interface 2 are used to display the release
sub-number which again ranges from 1
through 4. Refer to Figure 12 for a detailed
view of the status LEDs and the corre-
sponding software version numbering
scheme. The Model 47’s initial software
release is version 1.1 which is represented
by the bottom LEDs of each status column
being lit.
To display the Model 47’s software version
is very simple. From the powered-down
state, press and hold the auto null button
associated with interface 1. Apply mains
power while continuing to press the but-
ton. The normal power-up sequence will
not occur but instead one LED will be lit
in the column associated with interface
1 and one LED will be lit in the column
associated with interface 2. As previously
described, these two LEDs represent
the unit’s current software version. While
the software version number is being
displayed the LED level meters will likely
display random readings. This is not a
problem and can simply be ignored. After
the software version number has been
“read” the auto null button can be re-
leased. At this time the unit will begin its
normal power-up sequence.
Note that while it’s easy to determine
which software version is loaded into
the Model 47 a trip back to the factory is
required to update it. The 8-bit micro-
controller that provides the unit’s logic
“horsepower” also includes internal