On Indicator: When power is applied to the MG2500, this red LED will light indicating power to the unit is On. When power is turned off, all current settings will be stored in non-volatile memory and recalled when power is turned back on. NOTE: During setup the MG2500 may instead be set to recall a special preset whenever power is turned on (see Setup on pg. 10).
AC Power Cord: The power transformer provides 27 Volts AC to the MG2500, and is detachable via a 5-pin DIN connector. The MG2500 has two internal ‘self-resetting’ fuses (there are no user serviceable parts inside the unit). If the internal fuses blow, they will attempt to re-set after a short period. However, this may be an indication that the MG2500 requires service.
Serial Port: This 9-pin Sub-D (male) connector provides an RS-
232Serial Port for remote control via computer or third-party controllers (see RS-232 Control on pg. 13). The Serial Port has the following pin assignments (left-to-right & top-to-bottom): Pin 1) not used; Pin 2) Receive Data (RxD) input; Pin 3) Transmit Data (TxD) output; Pin 4) Data Terminal Ready (DTR) output; Pin 5) Ground; Pin 6) not used; Pin 7) Request To Send (RTS) output; Pin 8) not used; Pin 9) not used. The default baud rate for the Serial Port is 38,400 (See RS-232 Control on pg. 13). Atlas Sound MG2500 software and a serial cable are provided for programming via Windows® 95/98/NT/2000/XP (see Setup on pg. 3). NOTE: The Serial Port can also transmit commands received via the Logic Inputs (see Setup on pg. 10).
Link Port: This 9-pin Sub-D (female) connector provides a Link Port for RS-232 control of multiple ATLAS SOUND® MG2500’s (see RS-232 Control on pg. 13). The Link Port of one device simply connects to the Serial Port of the next device (and so forth). NOTE: All but the final MG2500 in a system should have the Link Switch pressed in (see below). The Link Port has the following pin assignments (right-to-left & top-to-bottom): Pin 1) not used; Pin
2)Transmit Data (TxD) output; Pin 3) Receive Data (RxD) input; Pin 4) not used; Pin 5) Ground; Pin 6) not used; Pin 7) not used; Pin 8) not used; Pin 9) not used. NOTE: The Link Port will also transmit commands received via the Logic Inputs (see Setup on pg. 10).
Link Switch: The Link Switch is used when connecting multiple devices in a ‘Link Port to Serial Port’ configuration (see Link Port above). From the factory, the Link Switch is released (out). When connecting multiple devices, the Link Switch must be depressed (in) on all devices except the final device in the system (the device with no Link Port connection). NOTE: The Link switch must remain OUT when only a single device is being used.
Logic Inputs: This 25-pin Sub-D (female) connector provides sixteen logic inputs for controlling the MG2500 via contact-closures (see Logic Inputs on pg. 12). Logic Inputs are programmed using the software and serial cable provided with the MG2500 (see Setup on pg. 10). NOTE: From the factory, Logic Inputs 1~16 have no pre-programmed function.
Outputs 1 & 2: These plug-in barrier strips provide the balanced analog line-level Outputs from processor Channels 1 & 2. For balanced output, wire high to (+), low to (-), and ground to (). For unbalanced output, wire high to (+) and ground to (), leaving (-) unconnected. Signal level will be reduced by 6dB when outputs are unbalanced.
Input: This plug-in barrier strip provides the balanced analog line- level audio input. For balanced input, wire high to (+), low to (-), and ground to (). For unbalanced input, wire high to (+) and ground to both (-) & (). NOTE: The internal pink-noise generator provides a second input. Input & noise may be assigned in any combination to the two processing channels (see Setup on pg. 4).
