User manual BIAMP DA28R

[. . . ] For unbalanced input, wire high (+), and ground to both ( ) & (-). Phantom power (+24VDC) is available for condenser microphones (see DIP Switches below). Trim (Channels 1 & 2): These screw-driver adjustable controls set the channel gain (+24dB ~ +60dB) to compensate for different input signal levels. For best performance, adjust these controls so the channel +10 indicators flash only on occasional peaks. [. . . ] Logic Inputs 9~16 route Channel 2 to Outputs 1~8 respectively. Logic Inputs perform either `muting' or `unmuting' functions, depending upon the position of the `Invert Logic' DIP Switches (see above). When `Invert Logic' is assigned, the associated input is normally muted at all outputs, and a contactclosure will `unmute' the input at the desired output. From the factory, `Invert Locic' is not assigned, both inputs are normally unmuted at all outputs, and a contact-closure will `mute' the input at the desired output. Logic Inputs allow a variety of input/output routing (see Logic Inputs on pg. AC Power Cord: The power transformer provides 27 Volts AC to the DA28R, and is detachable via a 5-pin DIN connector. The DA28R 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 unit requires service. On Indicator: When the power transformer is plugged in, and AC power is applied to the DA28R, the red On indicator remains lit. 2 CH 1 12 watts class 2 wiring LOGIC INPUTS & TRANSFORMERS Logic Inputs: Logic Inputs 1~16 are on pins 1~16, and a common ground is on pins 17~25. Logic Inputs 1~8 affect routing of Channel 1 signal to Outputs 1~8, respectively. Logic Inputs 9~16 affect routing of Channel 2 signal to Outputs 1~8, respectively. Logic Inputs are triggered by being shorted to ground, usually by means of external switches, relays, logic outputs, or other such contact-closures. However, they may also be triggered permanently, via a `hard-wired' short to ground (see Applications on pg. Logic Inputs perform either `muting' or `unmuting' functions, depending upon the position of the `Invert Logic' DIP Switches (see diagrams below). From the factory, `Invert Locic' is not assigned on Channel 1 or Channel 2, and both inputs are normally unmuted (turned on) at all outputs. Contact-closures can then be used to `mute' (turn off) either input at selected outputs. When `Invert Logic' is assigned, the associated input is normally muted (turned off) at all outputs, and contact-closures can be used to `unmute' (turn on) that input at selected outputs. A combination of `Invert Logic' and normal (non-inverted) logic operation allows Channels 1 & 2 to provide an override function. With a single switch wired to two corresponding Logic Inputs (i. e. . . Logic Inputs 1 & 9), one input may be muted, while the other input is unmuted at the same output. This can be extremely effective in multi-zone, page-over-music applications (see Applications on pgs. 4). invert logic phantom invert logic phantom invert logic phantom invert logic phantom invert logic phantom invert logic phantom invert logic phantom invert logic phantom 13 25 1 14 logic inputs CH 2 CH 1 CH 2 CH 1 CH 2 CH 1 CH 2 T1 Logic Inputs pins 1~8 pins 9~16 pins 17~25 assign functions ch-1 to outputs 1~8 ch-2 to outputs 1~8 common ground Ch-1 & Ch-2 normally 'on' (switches mute) Ch-1 normally 'off' (switches unmute) Ch-2 normally 'on' (switches mute) Ch-1 normally 'on' (switches mute) Ch-2 normally 'off' (switches unmute) Ch-1 & Ch-2 normally 'off' (switches unmute) NOTE: The DA28R chassis must be dis-assembled before installing input/output transformers: 1) remove top panel (2 screws at bottom of each side panel; 1 screw at top-center of rear panel). [. . . ] THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED. BIAMP SYSTEMS DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. The remedies set forth herein shall be the purchaser's sole and exclusive remedies with respect to any defective product. No agent, employee, distributor or dealer of Biamp Systems is authorized to modify this warranty or to make additional warranties on behalf of Biamp Systems. [. . . ]