Peavey AC-8 User Manual page 5

The RS-485 network should be terminated with 120 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.
figure 2
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.
figure 3
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
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.
+
_
_ M _
V _
NET + _
I
_ _
_ _
NET + V I M
+
_
Switch Position
1 2 3 4 5 6 7
O
N
1 2 3 4 5 6 7
O
N
1 2 3 4 5 6 7
O
N
Phoenix Connector
(on back panel of AC8)
Amp Control
Binary Value MediaMatrix Unit ID
8
0
8
1
8
2
5
1
2
3
™
150TII,