User manual BIAMP SMS200

[. . . ] SMS200 Sound Masking System operation manual ® Biamp Systems, 10074 S. W. Arctic Drive, Beaverton, Oregon 97005 U. S. A. (503) 641-7287 http://www. biamp. com an affiliate of Rauland Borg Corp. Print Update April 11, 2000 SMS200 TABLE OF CONTENTS Front Panel Rear Panel Setup Logic Inputs RS-232 Control Applications Specifications & Block Diagram Warranty pg. 12 SMS200 features include: 1/3-octave equalizer with built-in sound masking generator white-noise generator spectral purity (±0. 1dB @ 0Hz~20kHz) precision pink-noise filtering (-3dB per octave low-pass) extended `non-apparent' repeat time of noise (200 minutes) 28 digitally controlled filters on ISO center frequencies Constant-Q technology provides precision system tuning filters adjustable ±12dB in 1dB steps or ±6dB in 0. 5dB steps noise & input levels adjustable ±12dB in 1dB steps (plus off) high-pass filter (12dB per octave) adjustable 9. 1Hz~171. 9Hz low-pass filter (12dB per octave) adjustable 1. 9kHz~34. 7kHz eight non-volatile memory presets available (levels & filters) logic inputs allow selection of presets via contact-closures RS-232 serial port for computer or third-party controllers software for Windows 95/98/NT & serial cable included ® INTRODUCTION ADVANTAGE SMS200 Sound Masking System provides a digitally controlled 1/3-octave equalizer, with a digital noise source in a single rack-space unit. [. . . ] A Power Up Action is then assigned in exactly the same way as they would be for a Logic Input. From the factory, the SMS200 has no Power Up Action assigned. When the SMS200 is powered up, and no Power Up Action has been assigned, the SMS200 will automatically recall the last settings which existed before it was powered off. Left-clicking on Echo Character opens a drop-down menu, which allows the `echo' character for the selected Logic Input to be changed. The Serial Number and Firmware Version are not displayed for `new' (`off-line') files. Left-clicking on Device Name allows a custom name to be given to the particular SMS200, by entering up to 30 characters of text. The Device Name will be stored in the SMS200 memory, and will be displayed on the title bar of the Main screen whenever that SMS200 is accessed with the software. Left-clicking on Bypass mode also sets the level control to unity gain will remove the check-mark, and thereby prevent Bypass from changing any current signal level settings. Left-clicking on Bypass mode also sets the high-pass and low-pass filters to their extremes will remove the check-mark, and thereby prevent Bypass from changing any high-pass filter or low-pass filter frequency settings. Left-clicking on Bypass mode also sets the pink-noise level to unity gain will add the check-mark, and thereby allow Bypass to change the noise level setting to unity gain. From the factory, Bypass is programmed to affect the signal level and high-pass & low-pass filters (as well as the 28 filter bands), but not to affect the noise level. Left-clicking on Restore Defaults will set all Configuration Options back to their factory defaults. 6 LOGIC INPUTS Sixteen Logic Inputs are available on a rear panel 25-pin Sub-D (female) connector. Logic Inputs allow remote control of preset selection via external circuits, such as switches, contact-closures, active driver circuits, and/or `open-collector' logic outputs. From the factory, Logic Inputs 1~8 are programmed to recall presets 1~8 respectively. Logic Inputs 9~15 are programmed to do nothing. Logic Input 16 is programmed to decrement (step down) from the currently selected preset to the next lower numbered preset (until reaching Preset 1). However, Logic Inputs may be individually programmed to perform other functions, using the PC Control Software and serial cable provided with the SMS200 (see Setup on pg. Since Logic Inputs are controlled by switches, contact-closures, etc. , each Logic Input may be assigned two functions (one for switch `closed' and one for switch `open'). Logic Inputs may be programmed to have no effect on ® the SMS200, but instead trigger ASCII characters which affect other ADVANTAGE products via RS-232 (see RS-232 Control on pg. Logic Inputs have the following pin assignments (right-to-left & top-to-bottom): Pins 1~16) Logic Inputs 1~16; Pins 17~25) Ground. 13 12 11 10 9 87 6 54 3 2 1 Pins #1~8 #9~15 #16 #17~25 Functions Logic Inputs 1~8 Logic Inputs 9~15 Logic Input 16 common ground Factory Programming Preset Select 1~8 NOP (no operation) Preset Decrement (step down to Preset 1) switch ground points (not programmable) 25 24 23 22 21 20 19 18 17 16 15 14 logic inputs When nothing is connected to a Logic Input, an internal pull-up resistor keeps it at a `high' idle state (+5. 0 VDC). The Logic Input is activated when its input goes `low' (less than +0. 8 VDC), and is de-activated when its input goes `high' (greater than +2. 4 VDC). A Logic Input is controlled in one of three ways: 1) Use an NPN style `open-collector' logic output from an external device (such as an ® ADVANTAGE PMX84 or DRC4+4) to short the Logic Input to ground. [. . . ] An ADVANTAGE CPA130 and two ADVANTAGE DT-2As provide amplification and interface to two distributed speaker systems. The SMS200 provides up to eight selectable presets, which include both equalization and level settings. In this application, the SMS200 is programmed with two presets: one provides equalization & level for the sound reinforcement signal, and one provides equalization & level for noise masking. A switch, connected to a logic input on the SMS200, is pressed by the judge when having `sidebar' (private) conversations with the attorneys. [. . . ]