Bel 2120B User's Guide - Media
Contents
1. BEL DIGITAL AUDIO Bel2120B The Bel2120B V2 0 Serial Protocols Overview Commands to be communicated to the remote unit 2120 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 Frame format Start Flag OXAA Destination Address Source Address The frame starts with a start character OXAA which is 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 OXFE Start Flag The start flag OXAA may be sent at any time If sent during a frame this will effectively cause the frame to restart Destination Address This should be set to the same as the comms address for the target 2120 This will be returned by the remote unit as the source address Source Address This should be set to 1 for 2120 This will be returned by the remote unit as the destination address Command This character is the command for the remote unit and must fall in the range 0X80 to OXEF More details of the relevant codes are shown below 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 OX7F i e 7 bits Checksum This is the modulo 7 sum of characters in the2. iere at AUPIO Bel 2120B Analogue AES SDI Shuffler MODEL 2128 AES EBU AUDIO SHUFFLER User s Guide TEEN BEL DIGITAL AUDIO Bel2120B 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 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 2004 BEL Digital Audio Ltd 2 BEL DIGITAL AUDIO INTRODUCTION FEATURES Input Switching and routing Inputs Input Levels Phase Reversal Outputs Monitor Outputs Memory Keyboard lock Front panel controls LCD Graphic Display Nudge up down av SET Input Output FAD MAT BYP LOCK Monitor level and output jack FIG 1 1 BEL 2120B FRONT PANEL FIG 1 2 BEL 2120B REAR PANEL OPERATION Matrix mode operation Mixer mode operation SETUP Page 1 Memory functions Page 2 Mode selection Page 3 Headphone monitor source selection Page 4 Input source selection Page 5 SDI group selection SDI output select Analogue output select AES output select SDI video standard select Ingroup deletion Input levels Analogue input gain adjustment Output levels Analogue output gain adjustme
3. Input Levels In either mode gain can be applied to the selected inputs before redirection or mixing The gain can be adjusted over the range 10 to 30 dB Phase Reversal In either mode the selected inputs can be phase reversed before routing or mixing Outputs The BEL 2120 provides simultaneous analog AES and SDI any group outputs Monitor Outputs A stereo headphone output is provided on the front panel to allow any pair of outputs to be monitored The signals on the left and right monitor outputs can be selected via the setup system 2004 BEL Digital Audio Ltd 5 BEL DIGITAL AUDIO Bel2120B Memory The operating mode and current setup are stored in one of eight memories This information is retained when the unit is switched off The memory can be reset to the factory default settings by depressing the set key while the BEL logo is displayed at power on Keyboard lock Inadvertent operation of the keys can be avoided by invoking the key lock function Front panel controls Several push buttons and indicators are located on the front panel Fig 1 1 from left to right these are LCD Graphic Display On power up the LCD will show model number software version and model description for a few seconds before resetting to the default display In its default mode the LCD will display e Current input to output connections Gains and phase reversal settings for each input e Memory number State of the
4. from SDI AES or analogue sources The right hand half of the screen allows the ANALOGUE INPUT GAIN to be adjusted This setup menu item will not time out to give the opportunity for setting levels INPUT LEVELS ANALOGUE 20 0 DAKAN 1 2 OdB 3 4 Output levels Analogue output gain adjustment The left hand half of the LCD display carries an indication of the level of the outputs from the Shuffler The right hand half of the screen allows the ANALOGUE OUTPUT GAIN to be adjusted This setup menu item will not time out to give the opportunity for setting levels OUTPUT LEVELS ANALOGUE 0 OUTPUT GAIN 1 OdB 3 4 SET Communications address This allows the address of the unit to be selected The unit will only respond to serial commands that contain its address The permitted range of addresses is 1 to 100 COMMS ADDRESS 2004 BEL Digital Audio Ltd 14 BEL DIGITAL AUDIO Bel2120B RS422 Serial control The BEL 2120 can be externally remotely controlled via the 9 pin RS422 socket on the rear panel Units can be connected in cascade by linking the RS422 output connector of one unit to the RS422 input connector of the next The RS422 signal is buffered by each unit and electro mechanically bypassed during power down When a recognized RS422 data word is received the BEL 2120B front panel will be locked out to avoid confusion Rear Panel Connectors From the left these are Analogue inputs upper 15 way D f
5. selection The operational mode of the unit Quad Matrix Dual Matrix or Mixer may be selected here The Nudge buttons makes the selection MODE SELECT AN QUAD MATRIX MODE DUAL MATRIX MODE MIXER MODE Page 3 Headphone monitor source selection The output directed to the left or right headphone monitor channel can be selected here To select a channel for the right monitor source press the SET key and then make a selection to return to the left monitor source press the input 1 key MONITOR SEL M LEFT MON RIGHT MON SET 2004 BEL Digital Audio Ltd 11 BEL DIGITAL AUDIO Bel2120B Page 4 Input source selection The audio source selection is organized in pairs The source channel for inputs 1 2 and then 3 4 can be selected here The possible sources are SDI 1 2 SDI 3 4 AES 1 2 AES 3 4 Analog 1 2 or Analog 3 4 To select the input 3 4 source press the SET key and then select the required input source using the av keys to return to the input 1 2 source press the input 1 key INPUT 3 4 SET Page 5 SDI group selection The input and output SDI group can be selected here To select an output group press the SET key and then make a selection to return to the input group selection press the input 1 key The 2120 can accept SDI inputs on one group and embed outputs on another The incoming embedded audio can be retaine
6. 3 DES es Output 4 Fig 2 1 2004 BEL Digital Audio Ltd 22 BEL DIGITAL AUDIO Bel2120B 2120 Mixer mode Level adjust Inputs 1 2 Output 1 3 4 Level adjust Inputs F ZE Output 2 Output 3 Output 4 Fig 2 2 2004 BEL Digital Audio Ltd 23
7. FAD MAT BYP and LOCK switches Nudge up down av These buttons are used to adjust input gains when the default screen is visible and the value of parameters within the setup menus SET This key will enter the setup menus See setup section for details of this operation Input Output Two horizontal rows of switches control the input and output selection The upper row marked 1 to 4 are the input selection switches The lower row are the output selectors red LED indicator positioned beneath each input switch will show the currently active input channel See below for detail of their use FAD This switch is only functional in the matrix mode and can be used to override any gain adjustments imposed on the input audio If the character F is not shown in inverse video on the right hand side of the LCD display all inputs are passed to the selected outputs without gain adjustment The gains shown on the LCD will be 2004 BEL Digital Audio Ltd 6 BEL DIGITAL AUDIO Bel2120B contained in outline boxes These values can be adjusted but the gain variation will not take effect until the FAD switch is activated MAT This switch is only functional in the matrix mode and can be used to override any redirection imposed on the input audio If the character M is not shown in inverse video on the right hand side of the LCD display all inputs are passed to their appropriate output Le in 1 to out 1 in 2 to out 2 etc The discs connecting in
8. RATION The BEL 2120 Shuffler can operate in either the Matrix or the Mixer mode Matrix mode operation In the quad matrix mode of operation each of the four output channels can have one of the inputs associated with it The inputs can be derived from the SDI AES or analog inputs The gain and phase of each input can be modified depending on the state of the FAD MAT and BYP controls before being passed to the output The LCD display in this mode shows the 4 output channels their associated input and its gain or phase modification X points Level adjust Outputs BE KOS FI RES KCS EJ PROG 1 Inputs To operate in the quad matrix mode first ensure that quad matrix is selected in the setup menu The Matrix modes can be confirmed if the amber LED to the right of input switch 4 is extinguished Then select the OUTPUT required by depressing the appropriate numbered switch on the lower horizontal row The output selected will be indicated by a solid line on the matrix on the LCD display the current input channel associated with this output is indicated by the LED If required the input channel can now be changed by depressing the required switch on the upper row The level of that channel can be adjusted by depressing the nudge av keys the current level in dBs will be shown on the LCD display A phase reversal can be applied to the input channel by depressing the INV switch The phase reversal is indicated by a symbol on the LCD dis
9. arate ground returns It is also recommended that 360 degree connection be made to the screening braid on the BNC connectors Screened D type connectors are also recommended EMC compliance The BEL 2120 was designed and tested to comply with the EMC directive numbers EN55103 EN55022 and EN55082 1 when used as directed 2004 BEL Digital Audio Ltd CE 16 BEL DIGITAL AUDIO Bel2120B Specification Bel Model 2120B SDI I O Inputsl O Analogue Inputs Inputs A D Level Noise Bandwidth Input impedance Serial component digital video signal 4 2 2 to SMPTE 259M 4 Channels from SDI Groups 1 to 4 SMPTE 272M A 4 channel differential 24 bit x 64 oversampled 6dB in for 9dB Digital max 15dB 105 dB wrt Max input Audio precision weighted 20Hz to 20kHz 20Hz to 20kHz 0 5dB 25kQ differential Analogue outputs Outputs D A Level Output impedance Noise Bandwidth Monitor output 4 Channels Differential 24 bit 6dB out for 9 dB digital in Max 15dB 50Q 110dB wrt Max output Audio precision weighted 20Hz to 20kHz 20Hz to 20 kHz 0 5dB 2 channel analogue with source selector min 8Q AES EBU Digital I O Input Output General Remote interface Power requirements Power consumption Dimensions Net weight 2 pairs AES EBU 32 to 50 ks sec 2 pairs AES EBU 48 ks sec RS422 9 6kBaud 96 265 VAC 50 60 Hz 40W 428w x 44h x 20d 1U Tkg 2004 BEL Digital Audio Ltd 17
10. d or deleted as described below idee OUT Group SET SDI output select The SDI outputs can be connected in pairs either to the SDI inputs not shuffler inputs or shuffler outputs SDI op1 2 SDI op3 4 SET 2004 BEL Digital Audio Ltd 12 BEL DIGITAL AUDIO Bel2120B Analogue output select The 4 analogue outputs can be connected to either the Shuffler inputs or outputs and this can be selected here Depress set again to select AES outputs AES output select The AES outputs can be connected to either the Shuffler inputs or outputs and this can be selected here Depress the 1 input button to return to analog select OUTPUT SEL AES Out SDI video standard select The SDI de multiplexer can accept PAL or NTSC video standards These can be selected here VIDEO SEL Ingroup deletion The incoming group selected by the shuffler can be deleted or retained This facility can be selected here If the incoming and outgoing groups are the same the shuffler will automatically delete the incoming group ingroup delete retain ingroup delete SET 2004 BEL Digital Audio Ltd 13 BEL DIGITAL AUDIO Bel2120B Input levels Analogue input gain adjustment The left hand half of the LCD display carries an indication of the level of the inputs to the Shuffler Note that these may come
11. el of that channel can be adjusted by depressing the nudge av keys the current level will be shown in dBs on the LCD display A phase reversal can be applied to the input channel by depressing the INV switch The phase reversal is indicated by a symbol on the LCD display positioned beside the corresponding input Note that the FAD MAT and BYP buttons are inoperative in this mode 2004 BEL Digital Audio Ltd 10 BEL DIGITAL AUDIO Bel2120B Setup The setup function of the 2120 is accessed by depressing the SET key Parameters adjustable under setup can be made to appear sequentially by repeatidly depressing the SET key Each of the setup menus with the exception of the memory recall show values that can be adjusted by means of the nudge av keys The setup menu will time out after 30 seconds if no adjustment is made The functions available in setup are as follows Page 1 Memory functions The first press of the SET key will enter the memory recall state The word PROG on the lower portion of the LCD will flash It is possible to browse the states of the 8 memories by pressing the input and output selection switches Input switches 1 to 4 will display the memory settings 1 to 4 output switches 1 to 4 will display the memory settings 5 to 8 The memory setting are merely displayed up to this point to activate a particular memory first select the required number as described above and then hit the same switch a second time Page 2 Mode
12. emale Analogue outputs lower 15 way D female SDI input BNC 757 SDI output BNC 757 AES VO 15 way D female RS422 in serial Port 9 Pin D female RS422 out serial Port 9 Pin D female Mains power 230 115VAC IEC 3 Pin A mains switch and fuseholder 230V 250mA 115V 500mA Pin Connections Audio inputs Pinl Chl Pin9 GND Pin2 Chl Pin 10 GND Pin3 Ch2 Pin 11 GN Pin4 Ch2 Pin12 GN Pins Ch3 Pin 13 GN Pin6 Ch3 Pin 14 GN Pin7 Ch4 Pin 15 GND Pin8 Ch4 Audio outputs Pinl Chl Pin9 GND Pin2 Chl Pin 10 GN Pin3 Ch2 Pin1ll GN Pin4 Ch2 Pin12 GN Pin5 Ch3 Pin13 GN Pin6 Ch3 Pin 14 GND Pin7 Ch4 Pin 15 GND Pin8 Ch4 D D D D D D D D 2004 BEL Digital Audio Ltd 15 BEL DIGITAL AUDIO AES I O Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 RS422 IN Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 RS422 OUT Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Ch1 2 Out Ch1 2 Out Ch3 4 Out Ch3 4 Out Ch1 2 In Ch1 2 In Ch3 4 In Ch3 4 In Chassis Tx Rx GND GND Chassis Rx Tx GND GND Pin9 GND Pin 10 GND Pin 11 GND Pin 12 GND Pin 13 GND Pin 14 GND Pin 15 GND Pin6 GND Pin7 Tx Pin8 Rx Pin9 Chassis Pin6 GND Pin7 Rx Pin8 Tx Pin9 Chassis Bel2120B It is recommended that where possible all cables be good quality screened twisted pairs with the screening braid connected to pin 1 on the XLR connector Optimum performance is obtained using double screened cable with sep
13. frame between the destination address and the last data character inclusively It is calculated thus DO checksum character checksum AND 0X7F 2004 BEL Digital Audio Ltd 18 BEL DIGITAL AUDIO FOR ALL CHARACTERS IN FRAME End Flag A character OXFE ends the frame Commands Commands to the 2120 Bel2120B Code Function Reply hex 80 Prompt for reply CO ACK OK C1 NAK send again 81 Use first data char as a second command ACK 82 Request unit identifier ACK then C2 85 Send program number Data count 1 then program ACK number 0 7 87 Request program number ACK then C7 8C Parameter reset ACK 8D Send 16 input gains Data count 16 then 16 gain ACK values as below 8E Request 16 input gains ACK then CE 8F Send general data Data count 6 then data as ACK below 90 Request general data ACK then DO 91 Send output gains Data count 4 then 4 gain values ACK 92 Request output gains ACK then D2 93 Send 1 input gain value Data count 1 then input ACK number and then gain value 94 Send mode Data count 1 then mode value ACK 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 ACK then a frame containing 0XC2 and the ident string 2004 BEL Digital Audio Ltd 19 BEL DIGITAL AUDIO Bel2120B General data format The send a
14. nd request general data 8F 90 commands communicate most switch settings to PC and 2120 The format for these is Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 0 Msb of Input for Msb of Input for Msb of Input for bit 4 out 3 bit 2 out 2 bit O out 1 Matrix matrix matrix mode mode mode Byte 1 Msb of Current Msb of Current Msb of Input for bit 5 output bit 3 input bit O out 4 Matrix mode Byte 2 Video Msb of Left Remote Byp Mat Fad mode bit 4 monitor Lock source Byte 3 Msb of Output Msb of Input Msb of Right bit 4 SDI bit 2 SDI bit O monitor group group source Byte 4 Msb of 3 4 Input Msb of 1 2 Input bit 3 source bit O source Byte 5 Xfade SDI SDI 1 2 Dual Mat mix Analogue AES 3 4output output mode mode output output source source source source Gain value format The data sent or received as gain values are formatted as follows Channel one first Gain range 10dB to 30 dB value 50 to 10 respectively Value of 9 mutes that channel Where more than one bit is required such as Group number the second bit is labeled Msb of bit n RS422 format 8 data bits no parity two stop bits 9600 Baud 2004 BEL Digital Audio Ltd 20 BEL DIGITAL AUDIO Bel2120B Appendix A 2120B operational description The signal routing capabilities of the 2120B is shown in Fig 2 0 The LCD display in matrix mode was generated for ease of use but does not literally describe the ope
15. nt Communications address 2004 BEL Digital Audio Ltd 3 Bel2120B O1 Ch Ch Lin U U Un U U OI IIIe 11 11 11 11 12 12 12 13 13 13 13 14 14 14 BEL DIGITAL AUDIO Bel2120B RS422 Serial control 15 Rear Panel Connectors 15 Pin Connections 15 EMC compliance 16 Specification Bel Model 2120B 17 SDI VO 17 Analogue Inputs 17 Analogue outputs 17 AES EBU Digital I O 17 General 17 The Bel2120B Serial Protocols 18 Overview 18 Frame format 18 Commands 19 General data format 20 APPENDIX A 21 2120B operational description 21 2004 BEL Digital Audio Ltd 4 BEL DIGITAL AUDIO Bel2120B BEL 2120 SDI Shuffler INTRODUCTION The Bel 2120 can process any combination of analog AES or SDI audio signals and simultaneously output the result in any of these formats The audio can be routed mixed inverted and level shifted A headphone monitor jack is also provided on the front panel The unit can be controlled by front panel switches or remotely Features Input Switching and routing The unit can operate in one of two main modes Matrix or Mixer In the Matrix mode available audio input can be selected modified and directed to any output In the Mixer mode any combination of inputs can be selected mixed and directed to any output See operational detail Inputs The inputs accepted by the Bel2120 are organized in pairs Input pairs from analog AES or SDI any group can be accepted
16. play positioned beside the corresponding output The dual matrix mode is identical to the quad matrix mode except that level adjustments are applied to pairs of inputs This feature facilitates accurate tracking of stereo pairs The dual matrix mode can be selected in the setup menu X points Level adjust Outputs r D B PROG 1 2004 BEL Digital Audio Ltd 9 BEL DIGITAL AUDIO Bel2120B Mixer mode operation The mixer mode identified by the amber LED provides the facility to select and mix a combination of any inputs and direct the result to any output As with the Matrix mode gain and phase reversal can be applied to the selected inputs In this mode the LCD display will show a different screen for each output selected The display will indicate the level and phase reversal of each input together with the current input for adjustment Selected input Input level Inputs To operate in the Mixer mode first ensure that Mixer is selected in the setup menu The amber LED to the right of input switch 4 is active Then select the output required by depressing the appropriate numbered switch on the lower horizontal row The page corresponding to the output selected will be shown on the LCD display the current input channel is indicated by the corresponding LED and on the LCD If required the input channel for adjustment can now be changed by depressing the required switch on the upper row The lev
17. put lines to output lines will be replaced by outline squares The position of these connections can be adjusted but the actual input output assignment will not be made until the MAT switch is activated BYP This switch will activate an electronic bypass and is a combination of FAD and MAT No gain adjustment or redirection of the inputs occurs when the character B is shown in inverse video on the right hand side of the LCD display LOCK When the unit is locked all the front panel keys except LOCK are inoperative To release the keys press and hold the LOCK key for a period in excess of five seconds A momentary press of the LOCK key will again place the unit in the lock mode The locked mode is indicated by the character L shown in inverse video on the right hand side of the LCD display Monitor level and output jack The headphone monitor output is available from this 6 mm stereo Jack The outputs to this jack can be selected in the setup menus the audio level is set by the small knurled control 2004 BEL Digital Audio Ltd 7 BEL DIGITAL AUDIO Bel2120B w Z Z Z MIX zam ns RES EBU a AUDIO SHUFFLER oum EB es a B MODEL 2128 Fig 1 1 Bel 2120B Front panel ANALOG INPUTS www beldigital com BEL DIGITAL AUDIO LTD MADE IN THE EC AES 1 0 RS422 IN RS422 OUT ANALOG OUTPUTS Fuse Rating 2A a s 90 260V 50 60HZ Fig 1 2 Bel 2120B Rear panel 2004 BEL Digital Audio Ltd BEL DIGITAL AUDIO Bel2120B OPE
18. ration of the 2120 Each output has 4 independent level adjustments associated with it These adjustments are actually on the inputs not on the outputs as shown on the LCD Inversion is also done on the inputs not outputs As there is only one input routed to each output whether the level is set on input or output would seem to be academic However the effect of this can be seen by selecting one output and then setting different levels for each input Changing the input select for this output then restores the set level value Each output is independent so there are in effect 16 level settings in the 2120 Fig 2 1 Similarly the mixer mode has 16 level adjustments independent from the matrix gains Fig 2 2 SDI 1 2 SDI 3 4 OUTPUT 122 AES 1 2 R JNPUTS1 2 PROCESSOR SDI1 2 ANLG1 2 SDI3 4 ANLG 3 4 AUDIO REAR aen PROCESSOR Gang INPUTS AES 3 4 OUTPUTS PROCESSOR OUTPUT 1 2 ANLG 1 2 SDI1 2 ANDREA SASA BSE AES 1 2 PROCESSOR INPUTS 3 4 AES 3 4 SELECT PROCESSOR OUTPUT1 2 ANLG 1 2 PROCESSOR OUTPUT 3 4 ANLG 3 4 Fig 2 0 2004 BEL Digital Audio Ltd 21 BEL DIGITAL AUDIO Bel2120B 2120b matrix mode D lt D w o Le E L cae Inputs N D Output 1 3 1 3 4 14 Level adjust Inputs N eg r D D lt lt D D Eu RR a W w w w w W D N N N N o a w N Q gt w N mn mn c c 4 4 Output 2 Inputs Output
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