Peavey A/A-AC8, User Manual

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5
The RS-485 network should be terminated with 120
Ω
resistors. This is especially important when the network
approaches its maximum length of 4,000 feet. A maximum of 32 A/A-AC8s may be connected to the
RS-485 network.
Figure 2 shows the wiring of an A/A-AC8 to the RS-485 network.
(on back panel of AC8)
+ NET
_
NET +
_
+
_
_
+
Phoenix Connector
V _ I
_
M
_
V
_
I
_
M
_
SETTING THE UNIT ID 8-PIN DIP SWITCH
The Unit ID 8-pin DIP switch on the back of the A/A-AC8 defines the address of the unit in the RS-485 network.
The 8-pin DIP switch represents a binary number, with position 1 being the least significant bit, position 5 being
the most significant bit. (Only the first five switches are used.) The UP or ON position of a switch represents a
binary 1, while the DOWN or OFF position of a switch represents a binary 0. Notice that all switches OFF is
equivalent to binary 0, but in the MediaMatrix amp control software view file, this defines location 1 in the AC8
Network. Note that each A/A-AC8 in the RS-485 Network must have its own unique unit ID location.
Figure 3 shows some Unit ID switch examples.
Amp Control
MediaMatrix Unit ID
1
2
3
Binary Value
0
1
2
Switch Position
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
O
N
O
N
O
N
CONNECTING AN AMPLIFIER TO THE A/A-AC8
The A/A-AC8 communicates with an amplifier through an 8-conductor RJ-45 telephone-type cable. The amplifier
must be equipped with an ACI-2 communications module. Communication with a dual channel (stereo) amplifier,
such as the IA
™
400, requires two A/A-AC8 channels. The communication cable from the dual channel amp must
be connected at the A/A-AC8’s Amplifier Interface to one of the DUAL CH1/2, CH3/4, CH5/6, CH7/8 inputs, and
the following input must remain unconnected. Single-channel (mono) amplifiers, such as the IDC
™ 150TII,
require only one A/A-AC8 channel. Single-channel amps may be connected to any A/A-AC8 Amplifier Interface
input, except immediately following a dual channel amp input.
figure 2
figure 3