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7
ACS 4.1 Installation and Operation Manual
INSTALLATION
Audio Input and Output Level Adjustment
Once the input and output connections have been made, the input levels can be adjusted. The
switcher is factory set for unity. Recommended input levels would be in the range of 0 dBu
to +8 dBu. Should input levels need to be changed, trimmers are accessible from the front
panel. Each stereo input is labeled and has one trimmer per channel.
Calibrating audio levels on the switcher:
1 – Remove power from the unit and remove the circuit board from the chassis.
2 – Feed a reference signal into input channel 1. A 2khz sine wave test tone at +4 dBu is
used at the factory. Connect a Hi-Z dB meter to the TEST jack JP3.
3 – Reapply power. Adjust the left and right input 1 trimmers to a zero level on your dB meter.
4 – Disconnect the dB meter and connect a balanced stereo input dB meter to the output.
Adjust the output trimmers (R14, R15) for the desired output level. +4 dBu is set at the
factory. Make sure input 1 is selected.
5 – Once input 1 and the output have been calibrated the rest of the inputs maybe adjusted.
PIP (GPI)/Remote Control Inputs
The ACS 4.1 has eight status inputs that may be configured for PIP (“triggers”) or remote
control operation and accept momentary contact closures (sustained, if break before make);
open collector or TTL/CMOS input logic levels. In addition to the PIP/remote control inputs
located on TB4, the silence sense tally open collector is also present (OC-SS).
(Top Row, TB4)
(Bottom Row, TB4)
The operation mode is set by the SW6-7 Dip-switch, when SW6-7 is OFF the unit is in
remote control mode and when SW6-7 in ON the unit is in PIP mode. The PIP/remote con-
trol connections to the switcher are found on the top and bottom rows of the connector TB4.
Each channel may be selected by a momentary contact to ground. Each channel is pulled
high (5-volts) through a 22K resistor.
In remote control mode the inputs are triggered by momentary closure to (pulsing) to ground
(low.) For example, in overlap or mix mode pulsing the “MUTE” input to ground would turn
off the output of the ACS 4.1 by muting all of its input channels until a front panel source
switch is pressed, a different remote control input is activated, the unit is powered up and/or
a serial command is received from a PC or other serial device.
Pulsing the “STEP” input to ground will step the unit one source for each low to high tran-
sition on this input. Automatic timed sequencing may be accomplished by holding the step
input low. The unit will then step to each source at a user programmable rate from 1 to 99
seconds (10 seconds by default). The last step channel is user programmable and is set to 4
by default. This feature may be used to sequence through multiple station air monitor sig-
nals for a program on-hold feed.
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PIP6
STEP
PIP1
IN-1
PIP7
MACRO
PIP2
IN-2
PIP8
EAS
PIP3
IN-3
OC-SS
PIP4
IN-4
DGND
PIP5
MUTE
