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BEL DIGITAL AUDIO 

BMA2-4SHD  

BM-A series serial protocol 

 2006 BEL (Digital Audio) Ltd 

24 

 Version 0.8 

Commands 

Commands from the remote controller to BM-A series unit(s).

 

Code(Hex) Function 

Reply 

80 

General prompt for a reply 

C0 - ACK (OK)  
C1 - NAK (send again) 

81 

Use first data char as a second command 

ACK 

82 

Request unit identifier 

C2. 

83 

Set up switches Data count =5 See below for format 

ACK 

84 

Set up alarm functions Data count=2 See below for format 

ACK 

85 

Request Detail 

C5 

86 

Request Switches 

C6 

 

Replies 

Replies, when requested (e.g. 82), will consist of frames that contain the original command 
value plus 0X40. So a request for an ident, 0x82, will elicit a reply of a frame containing 0xC2 
and the ident string. (BM-A series model Vn.n) 

Summary of Contents for BMA2-4SHD

Page 1: ...BMA2 4SHD audio monitor alarm system User s Guide Version 0 8 2 2 2006 ...

Page 2: ...ed for information purposes only and does not constitute any form of warranty or guarantee All trademarks acknowledged The information in this document is subject to change without notice Bel Digital Audio Ltd Unit 3 Horwood Court Bletchley Milton Keynes Bucks MK11RD Tel 01908 641063 Email info beldigital com Web www beldigital com Manual prepared by AirdServices http brianaird members beeb net ...

Page 3: ...og input level 10 Adjusting audio monitor output level 11 Adjusting alarm tone 12 Adjusting bargraph break points and ballistics 13 Inserting bargraph graticules 16 USING MONITORMX SOFTWARE 17 Main Features 17 MONITORMX SOFTWARE OPERATION 18 Running MonitorMx software for the first time 18 Viewing connected units 18 Configuring alarms 19 Source selection 20 Meter characteristics 20 Disabling local...

Page 4: ...BEL DIGITAL AUDIO BMA2 4SHD 2006 BEL Digital Audio Ltd OVERVIEW 22 Frame format 22 COMMANDS 24 DATA FORMATS 25 PROBLEM SOLVING 30 Sample problems and their solutions 31 SPECIFICATION 32 ...

Page 5: ... and sustained anti phase Main features 1 x SD and 1 x HD video inputs Auto PAL NTSC detection Handles SDI embedded groups 1 4 2 x AES or 2 x analog audio input pairs Option for balanced XLR or unbalanced BNC digital audio I O High quality high SPL audio reproduction with soft limiting 4 x tri color bargraphs with six standard scales and ballistics adjustable color transition points and peak hold ...

Page 6: ...ker switches select which of the currently selected four audio channels is available at the speakers after three stages of analog processing The selected audio is first passed through factory preset equalization filters Then electronic level control is then applied with the balance and volume knobs providing control voltages Finally a soft limiter is used to protect the speakers The headphone outp...

Page 7: ...peaker selectors and bargaphs The possible choices are Analog AES A B or SDI embedded groups 1 to 4 from either the SD or HD inputs as determined by the video source switch The REM or remote position of the video source switch forces BMA2 4SHD to be controlled from the serial port Any serial commands will then take precedence over the front control panel Note If a video source is selected using th...

Page 8: ...he over level alarm threshold can be adjusted by moving the red bar transition point To prevent the anti phase detector from generating intermittent alarms only persistent anti phase conditions are used to raise an external alarm or generate an audio tone An alarm is generated when an anti phase condition exists for more than 10 seconds Alarm arming No alarms are generated unless alarm functions h...

Page 9: ... stop the audible alarm but retain the visual alarm indications and TTL serial alarm outputs The switch must be held in the ALARM RESET position for more than 3 seconds for all alarms to be cleared The center position is the recommended position when alarm indication is not required Note Restoring input signals to normal condition does not clear alarms ...

Page 10: ... 300mSec 300mSec BBC PPM 12 to 12dB mark 7 to 1 10mSec 2 85Sec mark 7 to 1 VU EXT 80dB 20 to 60dB 300mSec 300mSec NORDIC 54dB 12 to 42dB 5mSec 1 7Sec per 20dB decay BMA2 4SHD scale ballistics Stick on scale graticules which may be applied to the space between the front panel bargraphs are supplied with the machine BMA2 4SHD scale graticules Note Bargraph color transition points and peak hold decay...

Page 11: ... unit Frames may be installed into bays providing airflow through these vents is not impeded The 2U BMA2 4SHD showing ventilation slots Connector I O All connections with the exception of the headphone socket are provided on the rear panel Video inputs use BNC connectors and all data connections use 9 way D type connectors The BMA2 4SHD balanced audio version rear view Digital audio I O may be sup...

Page 12: ...ed 7 Not connected 8 Not connected 9 Not connected Note TTL outputs can supply up to 10mA RS232 Host interface connector pinout Connector type 9 way D female Speed 9600 bps Format 8 bit no parity 2 stop bits Pin Description 1 Not connected 2 Rx from host 3 Tx to host 4 Not connected 5 GND 6 Not connected 7 Not connected 8 Not connected 9 Not connected Note A null modem lead will be required to int...

Page 13: ...l adjustments The following adjustments may be made Monitor output level SW3 potentiometers main board Analog input level SW4 and SW5 potentiometers main board Bargraph settings SW1 and SW2 main board near power supply Alarm tone RV7 main board Warning Configuration instructions are for trained personnel To avoid dangerous electric shock do not remove any covers or carry out adjustments unless qua...

Page 14: ...B 5 2 0 dB 0dBu in 0 on analog scale 6 2 4 dB 4dBu in 0 on analog scale 7 2 8 dB 8dBu in 0 on analog scale 8 2 Variable adjacent pot 10 to 12 dB SW5 Anlg Input Setting when ON 1 3 0 dB 0dBu in 0 on analog scale 2 3 4 dB 4dBu in 0 on analog scale 3 3 8 dB 8dBu in 0 on analog scale 4 3 Variable adjacent pot 10 to 12 dB 5 4 0 dB 0dBu in 0 on analog scale 6 4 4 dB 4dBu in 0 on analog scale 7 4 8 dB 8d...

Page 15: ... dB 0 on analog scale 0dBu on output 2 Left 4 dB 0 on analog scale 4dBu on output 3 Left 8 dB 0 on analog scale 8dBu on output 4 Left Variable adjacent pot 0 to 12 dB 5 Right 0 dB 0 on analog scale 0dBu on output 6 Right 4 dB 0 on analog scale 4dBu on output 7 Right 8 dB 0 on analog scale 8dBu on output 8 Right Variable adjacent pot 0 to 12 dB Note It is intended that only one switch lever is set ...

Page 16: ...iguration 2006 BEL Digital Audio Ltd 12 Version 0 8 Adjusting alarm tone The alarm tone adjustment is located near the analogue input controls Alarm tone adjustment Control Effect of clockwise rotation Alarm tone Decrease alarm level ...

Page 17: ... signals Note When digital inputs are used with an analogue scale the line outputs will be less than that indicated on the meters since the digital to analogue converters clip at 15 dB The effective loss is 3dB when the 18 dB position is selected and 5dB when the 20 dB position is selected SW1 7 SW1 6 Peak hold decay OFF OFF None Off OFF ON 3 seconds ON OFF 7 seconds ON ON Indefinite SW1 5 SW1 4 S...

Page 18: ...t from bargraph top OFF OFF OFF OFF OFF None OFF OFF OFF OFF ON 1 OFF OFF OFF ON OFF 2 OFF OFF OFF ON ON 3 OFF OFF ON OFF OFF 4 OFF OFF ON OFF ON 5 OFF OFF ON ON OFF 6 OFF OFF ON ON ON 7 OFF ON OFF OFF OFF 8 OFF ON OFF OFF ON 9 OFF ON OFF ON OFF 10 OFF ON OFF ON ON 11 OFF ON ON OFF OFF 12 OFF ON ON OFF ON 13 OFF ON ON ON OFF 14 OFF ON ON ON ON 15 ON OFF OFF OFF OFF 16 ON OFF OFF OFF ON 17 ON OFF O...

Page 19: ...OFF OFF ON ON 3 OFF OFF ON OFF OFF 4 OFF OFF ON OFF ON 5 OFF OFF ON ON OFF 6 OFF OFF ON ON ON 7 OFF ON OFF OFF OFF 8 OFF ON OFF OFF ON 9 OFF ON OFF ON OFF 10 OFF ON OFF ON ON 11 OFF ON ON OFF OFF 12 OFF ON ON OFF ON 13 OFF ON ON ON OFF 14 OFF ON ON ON ON 15 ON OFF OFF OFF OFF 16 ON OFF OFF OFF ON 17 ON OFF OFF ON OFF 18 ON OFF OFF ON ON 19 ON OFF ON OFF OFF 20 ON OFF ON OFF ON 21 ON OFF ON ON OFF ...

Page 20: ...ch BMA2 4SHD BMA2 4SHD 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 repeat the process for the other bargraph graticule position ensure that the bargraph setting matches the graticule adjust the color transitions and peak hold decay as desired ...

Page 21: ... units from remote locations Main Features Fifteen alarm categories Signal presence Support for multiple units Automatic model detection and custom unit names Reads selected meter ballistics Full editing of scale transition points and peak hold characteristics Visual and aural alarms Individual and system alarm reset Disable option for local controls The MonitorMx software will run on Windows 98 S...

Page 22: ...automatically for BM A series units connected to the serial ports of the PC the software is running on when the application loads The Alarms Present indicator will illuminate red if any of the connected units are generating alarms Individual alarms and alarm configuration will only be shown for selected units Notes Not all alarm categories are supported by all BM A series monitors MonitorMx will n...

Page 23: ...enerated by any connected unit Controls are provided to reset alarms from all units and to enable visual alarm flashing and audible alerts for alarms generated from any connected units Resetting alarms Alarms are not automatically cancelled when a monitored signal is restored to normal To cancel alarms click on a Reset button for an individual unit or for all units using the Reset button in the Sy...

Page 24: ...ly be changed from the internal switches in the BM A series unit Color transitions Each bargraph has 53 tri color segments The top and bottom segments are reserved as alarm indicators leaving 51 Up to 31 of the remaining top most segments may be colored red Up to 31 of segments from the end of the red zone downward may be colored amber The remaining segments if any are always green The red and amb...

Page 25: ...RS232 port to PC RS232 port BM AV2 RS232 9 pin female D connector RS232 PC port 9 pin female D connector RS232 PC port 25 pin female D connector 2 Rx 3 Tx 5 3 2 5 2 3 7 Note A standard screened null modem cable should be adequate however pin numbers not shown do not need to be wired The screen is normally wired to ground via the D connector metalwork To install the MonitorMx software proceed as fo...

Page 26: ...frame starts with a start character 0xAA alternating ones and zeros This is followed by the destination address the source address the command code the data count the data a checksum and an end flag 0xFE Start Flag 0XAA Destination Address Source Address Command Data Count Data Checksum End Flag 0XFE Start Flag The start flag 0XAA may be sent at any time If sent during a frame this will cause the ...

Page 27: ...7 Data The data required for the command is carried here Each character can have a value of 0X00 to 0X7F i e 7 bits Checksum This is the modulo sum of the characters in the frame between the destination address and the last data character inclusively It is calculated thus DO checksum character checksum AND 0x7F FOR ALL CHARACTERS IN FRAME End Flag A character 0XFE ends the frame ...

Page 28: ...data char as a second command ACK 82 Request unit identifier C2 83 Set up switches Data count 5 See below for format ACK 84 Set up alarm functions Data count 2 See below for format ACK 85 Request Detail C5 86 Request Switches C6 Replies Replies when requested e g 82 will consist of frames that contain the original command value plus 0X40 So a request for an ident 0x82 will elicit a reply of a fram...

Page 29: ...witch will activate these commands Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 0 Ms bit of Video select Video select Ms bit of Audio select Audio select Audio select Byte 1 Color bar enable Ms bit of Right speaker select Right speaker select Ms bit of Left speaker select Left speaker select Byte 2 Ms Red zone Red zone Red zone Red zone Red zone Byte 3 Ms amber zone Amber zone Amber zone A...

Page 30: ...audio input 4 Color bar generator Setting this bit will replace the current SDI image with color bars Red zone data The numerical value of the five bits of the red zone data corresponds to the length of the red zone The origin of the red zone if the top of the bar graph Amber zone data The numerical value of the five bits of the red zone data corresponds to the length of the amber zone This zone i...

Page 31: ...fset when AES is input to an analog bar graph Code Function 0 18dB 1 20dB Set up alarms 0x84 Bit 6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 Byte 0 Reset Auto Audio Channel 4 Audio Channel 3 Audio Channel 2 Audio Channel 1 Byte 1 Toggle Disable Anti Phase 3 4 Anti Phase 1 2 Over level 4 Over level 3 Over level 2 Over level 1 The Auto bit will cause the unit to generate spontaneous ACK signals every second whi...

Page 32: ...ed Audio loss 4 Armed Audio loss 3 Armed Audio loss 2 Armed Audio loss 1 Byte 6 Armed Anti phase 3 4 Armed Anti phase 1 2 Armed Audio over level 4 Armed Audio over level 3 Armed Audio over level 2 Armed Audio over level 1 Request Current switch settings 0X86 This command will cause the unit to respond with a frame containing the command 0XC6 data describing the settings of the front panel and inte...

Page 33: ...on 0 8 Error message values Value Message 1 A time out occurred after receipt of a valid start character 2 A character was detected before receipt of a start character 3 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 34: ...s ON lights green when the unit is powered and switched on LIMIT lights red to indicate that the soft limiter is protecting the speakers AES A B lights yellow to indicate presence of the AES A 1 2 and or AES B 3 4 inputs SD lights yellow to indicate presence of SD input when selected HD lights yellow to indicate presence of HD input when selected NTSC lights red when NTSC input detected Phase 1 2 ...

Page 35: ...n points have been selected with the internal DIL switches Check that the chosen ballistics setting and bargraph scale graticules match An alarm continues to sound even though normal signals have been restored Mute the alarm with the ALARM MUTE switch or reset all alarms with the ALARM RESET switch by holding it upwards for more than 3 seconds An input signal has failed but no alarm was asserted A...

Page 36: ...connector Analog monitor outputs Max output level Noise THD 15dB 95dB Analog input 98dB AES input Frequency response All analog outputs 20 Hz to 20kHz 1dB Main drive amp Noise THD 80dB w r t maximum output Speaker driver units Peak acoustic level 2ft Shielding 100dB SPL Magnetic Meters Level meters 4 x hi resolution tri color bargraphs All audio measurements made using Audio Precision un wtd 22Hz ...

Page 37: ... 3 to 20dB Attack time 300mSec Fallback 300mSec VU EXT Overall dynamic range 80dB 20 to 60dB Attack time 300mSec Fallback 300mSec AES EBU Overall dynamic range 60dB 0 to 60dB Attack time 1mSec Fallback 1 5Sec per 20dB decay Alarms Audio loss audio over level sustained audio anti phase AES EBU carrier loss Housing 19 Rack Mount 2U high Outline Dimensions 483mm W x 256mm D x 89mm H Outline Dimension...

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