Studio Technologies 47A - Manual (Page 15)

Model 47A User Guide Issue 1, September 2014
Studio Technologies, Inc. Page 15
It’s important to ensure that the source of
the remote control signals can meet the
Model 47A’s logic state and timing require-
ments. The Model 47A recognizes an idle
remote control input as one that has no
current flowing through it. An active remote
control input is one that has current flow-
ing through it for a minimum of 30 millisec-
onds. A special case arises when the auto
null button operating mode has been set
to independent. This requires one front-
panel button tap to auto null channel 1 and
two button taps to auto null channel 2. The
remote control equivalent for one tap is
current flowing for a minimum of 30 millisec-
onds. The equivalent for two taps is current
that flows for 30 milliseconds, then a mini-
mum no-current period of 30 milliseconds,
followed by current flow for a minimum of
30 milliseconds. The second period of cur-
rent flow must come within one second of
the start of the first.
Once the interconnect method and the
source of the control signals have been
selected, refer to Figure 4 for connection
details. Ensure that the connected signals
follow the specified polarity or damage to
the opto-coupled inputs may occur.
It’s important that a competent technician
be available to perform the actual remote
control input connection process. As
expected, mating the interconnecting
cable assembly with the Model 47A’s 10-pin
“header” requires removing the unit’s cover.
As such, this must be done only after con-
firming that all sources of mains power have
been disconnected from the unit.
AC Mains Power
The Model 47A operates directly from AC
mains power of 100 to 240 V, 50/60 Hz. As
a “universal mains input” device, there are
no switches to set or jumpers to install. A
3-pin IEC 320 C14 inlet connector on the
Model 47A mates with a detachable mains
cord set. For units shipped to North Amer-
ica and Japan a cord is supplied that has
a North-American (NEMA 5-15L) standard
plug on one end and an IEC 320 C13 con-
nector on the other. Units bound for other
destinations require that the appropriate
cord set be obtained. The wire colors in the
mains cord should conform to the interna-
tionally recognized color code and should
be terminated according to the following
chart:
Connection
Wire Color
Neutral (N) Light Blue
Line (L) Brown
Earth/Ground (E) Green/Yellow
Safety Warning: The Model 47A does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection de-
vice. Safety considerations require that
the plug and associated inlet be easily
accessible to allow rapid disconnec-
tion of AC mains power should it prove
necessary.
10-Pin 9-Pin D-Sub
Function Header (P9) Interface Cable
Remote Auto Null Interface 1 + 7 4
Remote Auto Null Interface 1 – 9 5
Remote Auto Null Interface 2 + 2 6
Remote Auto Null Interface 1 – 4 7
Remote “Mic Kill” + 6 8
Remote “Mic Kill” – 8 9
Figure 4. Remote control input pin-out chart