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bel Digital Audio BM-AV3S User Manual

A/v monitor system
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BM-AV3S
A/V monitor system
User's Guide
Version 1.4 2/10/2009

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Summary of Contents for bel Digital Audio BM-AV3S

  • Page 1 BM-AV3S A/V monitor system User’s Guide Version 1.4 2/10/2009...
  • Page 2 BEL DIGITAL AUDIO BM-AV3S BEL (Digital Audio) Ltd. has made every effort to ensure the accuracy of information contained within this document which is nevertheless supplied for information purposes only and does not constitute any form of warranty or guarantee.

  • Page 3: Table Of Contents

    BEL DIGITAL AUDIO BM-AV3S NTRODUCTION Main features PERATION ELECTING SOURCES ARGRAPH SCALES NSTALLATION ONNECTOR RS232 Host interface connector pinout ONFIGURATION Adjusting analog input level Adjusting audio monitor output level Adjusting bargraph break-points and ballistics Inserting bargraph graticules SING ONITOR X SOFTWARE...
  • Page 4 BEL DIGITAL AUDIO BM-AV3S Sample problems and their solutions PECIFICATIONS © 2009 BEL (Digital Audio) Ltd...

  • Page 5: Introduction

    BM-AV3S Introduction The BM-AV3S is a professional audio and video monitor system housed in a 3U rack. The unit features two speakers, a high quality seven inch TFT video display and an analogue line output. Audio input signals can be in the form of analog, AES (SPDIF) and SDI embedded data.
  • Page 6 BEL DIGITAL AUDIO BM-AV3S Introduction The BEL Digital BM-AV3S All audio inputs are converted to 24 bit digital form and AES inputs are re-sampled using sample rate converters where necessary at an internally generated 48 kHz. If embedded audio from a serial digital video input is selected, the sampling clock recovered from this is used instead.

  • Page 7: Operation

    SD2 will monitor group 1 from the SDI2 serial digital video input. The REM or remote position of the video source switch forces BM-AV3S to be controlled from the serial port. Any serial commands will then take precedence over the front control panel.

  • Page 8: Bargraph Scales

    NORDIC: 54 dB (+12 to -42 dB) 5 ms 1.7 Sec per 20 dB decay BM-AV3S scale ballistics Stick-on scale graticules, which may be applied to the space between the front-panel bargraphs, are supplied with the machine. BM-AV3S scale graticules Note: Bargraph colour transition points and peak hold decay may also be adjusted internally.

  • Page 9: Installation

    BM-AV3S Installation The BM-AV3S 3U frame may be installed in 19 inch bays with 300 mm depth including typical cable and connector depth. Ventilation is by natural convection and there are vents at each side and on the top and bottom covers of the unit.

  • Page 10: Rs232 Host Interface Connector Pinout

    BEL DIGITAL AUDIO BM-AV3S Installation RS232 Host interface connector pinout Connector type: 9 way D female Speed: 9600 bps Format: 8 bit, no parity, 2 stop bits Description Not connected Rx (from host) Tx (to host) Not connected Not connected...

  • Page 11: Configuration

    BEL DIGITAL AUDIO BM-AV3S Configuration Access to BM-AV3S internal adjustments is obtained with the top removed. BM-AV3S internal adjustments The following adjustments may be made: • Monitor output level – SW3/potentiometers main board • Analog input level – SW4 and SW5/potentiometers main board •...

  • Page 12: Adjusting Analog Input Level

    BEL DIGITAL AUDIO BM-AV3S Configuration Adjusting analog input level In the following tables, ON is obtained with a switch lever in the DOWN position. The adjustments are located on the main board under the output sub-board. Analog input adjustments – 0 dB setting shown...

  • Page 13: Adjusting Audio Monitor Output Level

    BEL DIGITAL AUDIO BM-AV3S Configuration Adjusting audio monitor output level In the following tables, ON is obtained with a switch lever in the DOWN position. The adjustments are located on the main board under the output sub-board. Analog monitor output adjustments – 0 dB setting shown...

  • Page 14: Adjusting Bargraph Break-Points And Ballistics

    BM-AV3S Configuration Adjusting bargraph break-points and ballistics The adjustments, SW1 and SW2 are located near the power supply. BM-AV3S bargraph adjustments SW1-8 AES to analog adjust -18 dBFS = 0 on analog scale -20 dBFS = 0 on analog scale The –18 dB and –20 dB settings define the correspondence between AES input level and the...
  • Page 15 BEL DIGITAL AUDIO BM-AV3S Configuration Each bargraph has 53 tri-colour segments. The top and bottom segments are reserved leaving 51. Up to 31 of the remaining top most segments may be coloured red. Up to 31 of segments from the end of the red zone downward may be coloured amber. The remaining segments (if any) are always green.
  • Page 16 BEL DIGITAL AUDIO BM-AV3S Configuration Choosing how many segments are coloured amber from the end of ‘red zone’ sets the ‘amber zone’. Select from none to 31 using SW2-5, SW2-4, SW2-3, SW2-2 and SW2-1 as follows: SW2-5 SW2-4 SW2-3 SW2-2...

  • Page 17: Inserting Bargraph Graticules

    BEL DIGITAL AUDIO BM-AV3S Configuration Inserting bargraph graticules The following bargraph scale graticules are supplied with each BM-AV3S: BM-AV3S scale graticules To apply a graticule proceed as follows: • peel back the protective backing from the chosen graticule • apply the graticule to the space between a pair of bargraphs •...

  • Page 18: Monitorm X Software

    BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software The MonitorMx remote control and status software has been provided to ease the task of operating and monitoring one or more BM-AV3 units from remote locations. Main Features • Fifteen alarm categories •...

  • Page 19: Monitormx Software Operation

    BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software MonitorMx software operation The MonitorMx application provides monitoring of video and audio alarm status for any local BM-AV3 frame or multiple-frame system. MonitorMX main screen Running MonitorMx software for the first time The MonitorMx software will search automatically for BM-AV3 frames connected to the serial ports of the PC the software is running on when the application loads.

  • Page 20: Configuring Alarms

    BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software Configuring alarms To enable alarms on a selected BM-AV3 frame, check the alarm categories at the left of the main screen. Toggle inverts the selection. If an alarm is generated the associated virtual LED will change from green to red and will flash if the Flashing box has been checked.

  • Page 21: Source Selection

    BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software Source selection The source selection check boxes will only function if the Video Source switch on the selected unit’s front panel is in the REM (remote) position. The source selection is the same as that obtained at the front control panel with the addition of a colour bar test signal.

  • Page 22: Monitormx Software Installation

    BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software MonitorMx software installation The MonitorMx Remote Control and Status software is designed for the Bel Series of professional audio and video monitor units. The MonitorMx software MUST run on the same PC that the BM-AV3 unit(s) are physically connected to.
  • Page 23 BEL DIGITAL AUDIO BM-AV3S Using MonitorMx software If successful, the installation program will install a BEL Digital program group. Run the program from the program group using Start>Programs>BEL Digital>MonitorMx. Please see the Operation chapter for an explanation of program features.

  • Page 24: Bm-Av3 Serial Protocol

    BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Overview Commands to be communicated to the remote unit (BM-AV3) are arranged in frames. These frames will then be sent to the remote unit, which will always reply with either ACK for acceptance or NAK for rejection. Any requested reply then follows in the same frame format.
  • Page 25 BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Data count: This is the total number of data bytes following, up to a maximum of 127. Data: The data required for the command is carried here. Each character can have a value of 0X00 to 0X7F i.e.

  • Page 26: Commands

    BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Commands Commands from the remote controller to the BM-AV3S. Code(Hex) Function Reply General prompt for a reply C0 - ACK (OK) C1 - NAK (send again) Use first data char as a second command...

  • Page 27: Data Formats

    BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Data formats General Prompt (0x80) This command will cause the BM-AV3 to respond with an ACK or NACK reply. It can be used to poll the BM-AV3 for alarms. Set up switches (0x83) This command will operate only when the video select switch on the unit front panel is in the remote position.
  • Page 28 BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Video select codes Code Function Composite video input selected SDI 1 input video selected SDI 2 input video selected Remote position of switch Left and right speaker select codes Code Function Select audio input 1...

  • Page 29: Bit 6

    BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Bar peak indicator These two bits select the peak indicator timing. Code Time No peak indicator 3 Second hold time 7 Second hold time Indefinite hold time AES offset This bit selects the bar graph offset when AES is input to an analog bar graph.

  • Page 30: Byte 0

    BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Request Detail (0x85) This command will cause the BM-AV3 to respond with a frame containing the command 0XC5 and data describing the state of the unit and any alarms. Bit 6 Bit 5...
  • Page 31 BEL DIGITAL AUDIO BM-AV3S BM-AV3 serial protocol Error message values Value Message A time out occurred after receipt of a valid start character A character was detected before receipt of a start character. A checksum error occurred. The erroneous value is placed in Byte 1 RS232 format 8 data bits, no parity, 2 stop bits, 9600 Baud.

  • Page 32: Problem Solving

    BEL DIGITAL AUDIO BM-AV3S Problem solving The front panel provides five status LEDs. The BM-AV3S status LEDs The status LEDs have the following functions: • ON – lights green when the unit is powered and switched on • LIMIT – lights red to indicate that the soft limiter is protecting the speakers •...

  • Page 33: Sample Problems And Their Solutions

    BEL DIGITAL AUDIO BM-AV3S Problem solving Sample problems and their solutions There is no power to the unit Check the power cabling and the integral fuse in the IEC mains socket at the rear of the frame. Check that the power switch at the rear is in the on position.
  • Page 34 BEL DIGITAL AUDIO BM-AV3S Specifications Audio inputs 25k Ω differential Analog inputs impedance 110 Ω differential (XLR connector) or 75 Ω unbalanced (BNC Digital inputs impedance connector) Analog monitor outputs Max output level +15 dB Noise +THD -95 dB (Analog input)
  • Page 35 BEL DIGITAL AUDIO BM-AV3S Specifications Video Input 2 x SDI SMPTE 259M 1 x composite analog 1V p/p Output 1 x composite video converted from selected SDI input on BNC connector Screen TFT, 7 inch diagonal, 800H x 480V resolution...
  • Page 36 BEL DIGITAL AUDIO BM-AV3S Specifications Housing 19” Rack Mount: 3U high. Outline Dimensions: 483mm(W) x 256mm(D) x 133mm(H) Outline Dimensions: 19inch(W) x 10inch(D) x 4.75inch(H) Power 100W (max) 90-264 VAC 50-60 Hz Autoselect, Fuse 4A HAC Environmental Temperature 0 °C to 30 °C Humidity 70% max (non-condensing)

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