User manual PEAVEY A-A 640-2 DATASHEET

[. . . ] Communications are half-duplex and require a two-conductor, shielded cable (24 AWG twisted pair telephone cable is recommended). Figure 1 shows an example of a MediaMatrix-A/A-AC8 RS-485 network. 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. [. . . ] The 8-pin DIP switch represents a binary number, with position 1 being the least significant bit, position 5 being the most significant bit. ) 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. 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 IATM 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 IDCTM 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. This product should not be placed near a source of heat such as a stove, radiator, or another heat producing amplifier. Connect only to a power supply of the type marked on the unit adjacent to the power supply cord. Never break off the ground pin on the power supply cord. For more information on grounding, write for our free booklet "Shock Hazard and Grounding. Power supply cords should always be handled carefully. Never walk or place equipment on power supply cords. Periodically check cords for cuts or signs of stress, especially at the plug and the point where the cord exits the unit. The power supply cord should be unplugged when the unit is to be unused for long periods of time. If this product is to be mounted in an equipment rack, rear support should be provided. Metal parts can be cleaned with a damp rag. The vinyl covering used on some units can be cleaned with a damp rag or an ammoniabased household cleaner if necessary. [. . . ] This unit should be checked by a qualified service technician if: a. Anything has fallen or been spilled into the unit. The unit has been dropped or the enclosure damaged. The user should not attempt to service this equipment. [. . . ]