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7
ACS 4.4 G2 Installation and Operation Manual
OPERATION
Rear Panel
The ACS 4.4 G2’s rear panel hosts the audio and remote-control connectors, chassis
ground terminal, multi-drop RS-232 modular connector, and 3-pin universal power
supply connector. Installation is simplified with RJ45 jacks for balanced audio I/O
and plug-in euroblock screw terminals for audio expansion and remote control.
RS-232 Serial Port (RJ-11 Jack)
This RJ-11 jack is used to connect the ACS 4.4 G2 to a computer’s COM port for
RS-232 serial operation using the included reverse modular cable with 9-pin “S9”
female D-sub adapter. If your PC does not have a built-in RS-232 serial port but does
have USB, then a USB-to-serial adapter cable is a good way to add USB serial capa-
bility. We recommend USB-to-serial adapter cables that use the FTDI chipset and
have had good results with the model “SBT-FTDI” from Sabrent.
Audio Inputs
Each of the four stereo inputs are balanced bridging (20K
) at a nominal line level
of +4dBu. Input connections should be made to the + and – input pins for balanced
operation, or to the + input pins and grounding the - side for unbalanced input operation.
Front panel multi-turn level trimmers are provided for adjustment of each input channel.
Audio Outputs
The ACS 4.4 G2 provides four balanced low impedance stereo outputs. Output con-
nections should be made to the + and - outputs for balanced operation, or to the +
output and ground for unbalanced output operation. The output levels may be
adjusted with the internal single-turn trimmers.
CAUTION: In no case should
either the + or - OUTPUTS be connected to ground.
Connecting the Audio Inputs and Outputs
The input channels are numbered from 1 through 4 on the rear panel. The ACS 4.4
G2 interfaces to external audio equipment through RJ45 jacks using the standard
audio pinout. Follow the RJ45 connection tables below for the desired audio input
and output connections, which appear on the rear of the unit.
RJ45 Audio Input Jacks (J5) RJ45 Audio Output Jacks (J7)
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