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26

User’s Guide DMC-842

© RME

The block diagram shows the sig-
nal flow in a HDSP MADI-based
remote control system. MIDI com-
mands from a software on PC or
Mac travel from the MADI Out of
the HDSP MADI to the MADI In as
well as to the MIDI Out and MADI
Out of the DMC-842.

Additional to the remote com-
mands further MIDI data can be
transmitted, available then at the
DIN MIDI output jack of the DMC-
842. However, MIDI signals at the
DIN input jack can not travel back
to the computer. With input setting
MIDI the other direction is active.
MIDI data travel from the MADI out to the computer, but not back from the computer via MADI
to the DMC-842.

12.3 Remote Control Software

The included Windows software DMC-Control can use any existing MIDI port within the system
to perform remote control and status requests of any number of DMC-842s via a simple mouse
click. The latest version of the program can be downloaded for free from the RME website. Most
appealing is the combination with a HDSP(e) MADI (PCI card), offering a direct control of the
DMC-842 via MADI. The remote control software then uses a virtual MIDI port of the card (port
3), which directly sends and receives MIDI data via MADI (see above).

Software download:

http://www.rme-audio.de/download/dmc_control.zip

Brief description of the Windows Software DMC-Control

The program requires Microsoft .NET Framework version 2.0 or higher to be installed on the
computer. Is ths not the case it will be installed automatically from the CD.

The program is self-explanatory and very easy to use. It manages up to 8 DMC-842 simultane-
ously. Names can be assigned to all channels and all devices. DMC-Control not only offers a
remote-access to all front panel settings, but also a comfortable configuration of the Setup
menu, and direct access to the AES42 features of the connected microphones.

After the start first select a MIDI input and output which is connected to the DMC-842, via

Op-

tions - MIDI I/O Setup

.

Using the

Online

button the communication with the DMC-842 is started. The bottom line of the

program window shows the current state, like MIDI ports, Online / No Response / Offline etc.

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Содержание DMC-842

Страница 1: ...terface with Line Outputs 8 Channel AES to Analog ADAT Interface AES EBU Format and Sample Rate Conversion Optional 64 Channel MADI Interface 24 Bit 192 kHz Digital Audio MIDI Remote Control 24 Bit In...

Страница 2: ...el in Detail 9 1 General 16 9 2 Gain 16 9 3 Digital Phantom Power 16 9 4 Mode 2 17 9 5 Stereo Inactive 17 9 6 M S Processing 17 9 7 SRC 18 9 8 PAR 18 9 9 Sync 18 10 The Setup Men 10 1 General 19 10 2...

Страница 3: ...on and Background 37 16 3 Cables and Termination 38 17 MIDI 38 Technical Reference 18 Technical Specifications 18 1 Analog 40 18 2 Digital Inputs 40 18 3 Digital Outputs 41 18 4 Digital 41 18 5 MIDI 4...

Страница 4: ...re and water from entering the device Never leave a pot with liquid on top of the device Do not use this product near water i e swimming pool bathtub or wet basement Danger of condensation inside don...

Страница 5: ...User s Guide DMC 842 RME 5 User s Guide DMC 842 General...

Страница 6: ...and Characteristics The DMC 842 is an 8 channel interface for AES42 digital microphones with full remote control lability and optional MADI I O In a standard 19 box with 2 unit height the device offe...

Страница 7: ...ands for the Parameter settings mode see below Pushing the knob SET several times lets you access all functions consecutively The rotary encoder is a highly intuitive multifunctional device It is used...

Страница 8: ...see chapter 18 9 The AES I Os are transformer coupled ADAT OUT TOSLINK Optical ADAT outputs These provide the same signals as the AES EBU outputs but in ADAT format WORD IN BNC A push switch allows to...

Страница 9: ...responding LEDs are flash ing Pressing once all GAIN displays start flashing gain setting pressing twice selects all DPP then STEREO and so on To activate or deactivate a specific function per channel...

Страница 10: ...nformation can be found on our website http www rme audio com Distributor Audio AG Am Pfanderling 60 D 85778 Haimhausen Tel 49 08133 91810 Manufacturer IMM Elektronik GmbH Leipziger Strasse 32 D 09648...

Страница 11: ...t in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own ex pense RoHS This product has been soldered lead free an...

Страница 12: ...12 User s Guide DMC 842 RME...

Страница 13: ...User s Guide DMC 842 RME 13 User s Guide DMC 842 Usage and Operation...

Страница 14: ...stands for the Parameter settings mode see chapter 11 Setting the GAIN can be done in two ways Individually Hit the SELECT button of one or several channels The corresponding GAIN displays start flas...

Страница 15: ...clock at 44 1 kHz or 48 kHz DS QS With the DS LED additionally lit the sample rate will be 88 2 or 96 kHz with QS lit it will be 176 4 or 192 kHz A selection of DS and QS is also possible when using...

Страница 16: ...B in steps of 1 dB The device has its own gain control operational even in the asynchronous Mode 1 and as shown in the block diagram is placed in front of the SRCs When the microphone signals support...

Страница 17: ...TIVE LED lights up automatically The gain can not be set directly for inactive channels Therefore in Stereo mode the gain display of the right channel is turned off 9 6 M S Processing The DMC 842 incl...

Страница 18: ...vices CD players DAT machines etc can be used in a setup of digital devices just as if they were externally synchronized The SRC decouples input and out put clock sets the output clock to the common r...

Страница 19: ...sed to insert the device s audio data ID 01 channels 1 8 ID 02 channels 9 16 ID 03 channels 17 24 ID 04 channels 25 32 ID 05 channels 33 40 ID 06 channels 41 48 ID 07 channels 49 56 ID 08 channels 57...

Страница 20: ...on has to be manually activated in each unit The following table lists the delay in samples from two up to eight units connected serially When using four units the data of the first unit are delayed b...

Страница 21: ...ADAT and MADI at sample rates in the Double Speed and Quad Speed range is only possible when all units are synced by Single Speed word clock Because of the S MUX method the device else can not know wh...

Страница 22: ...received from the microphone When this feature is supported the DMC 842 switches off its gain control The choice can also be done manually Selecting the setting 42 AES42 the gain stage of the micropho...

Страница 23: ...computer The Parameter menu includes a direct display only for the most important functions The others are configured by a combination of command byte and parameter byte based on the table found in t...

Страница 24: ...control Such a function can be useful to prevent gain changes where audio should stop but the gain should stay unchanged or to dim the level meters of unused channels 11 5 Peak Limiter LImItEr Defaul...

Страница 25: ...Command Processor and the MIDI outputs This MIDI Through function pro vides the base for a simplified serial MIDI cabling when using multiple DMC 842s The same is true for remote control via MADI wher...

Страница 26: ...e combination with a HDSP e MADI PCI card offering a direct control of the DMC 842 via MADI The remote control software then uses a virtual MIDI port of the card port 3 which directly sends and receiv...

Страница 27: ...de 2 display Activation of DPP SRC Stereo odd channels only and M S The channel name can be edited Gain setting Setting the Directivity Pattern Choice of Mute and Phase Inversion Selection of the Pre...

Страница 28: ...l interface port Please note that this port is with out functionality at this time and reserved for future upgrades The functionality of a RS232 extender pass through of the serial data via MADI as kn...

Страница 29: ...User s Guide DMC 842 RME 29 User s Guide DMC 842 Inputs and Outputs...

Страница 30: ...s the clock on the AES wire In case a conversion from to Single Double and Quad Wire is required the ADI 192 DD an 8 channel universal sample rate and format converter is highly recommended Emphasis A...

Страница 31: ...yright Copy permitted Format Professional Category General Generation not indicated 2 Channel No Emphasis Aux bits audio use 24 bit Origin DMC8 Connecting devices with coaxial SPDIF ports to the DMC 8...

Страница 32: ...AES outputs As interesting as this is you don t need to think about it 96 kHz capable ADAT hardware like all current RME digital interfaces re combine the data automatically The user and the DAW soft...

Страница 33: ...etermining the block of eight channels used by an individual device is determined automatically Auto ID or manually in the setup menu ID ID 01 channels 1 8 ID 02 channels 9 16 ID 03 channels 17 24 ID...

Страница 34: ...activated in each unit ADI 642 Activate ADC Auto Delay Compensation in the first unit ID of the master is always 1 All following units become Slave and compensate the respective delay automatically T...

Страница 35: ...13 13 dBu 14 dB The DMC 842 delivers an undistorted maximum level of 27 dBu The referencing is based on full scale of the DA converters 0 dBFS will be reached at 13 19 or 24 dBu output level respectiv...

Страница 36: ...position and the yellow LED lights up Another push will release it again and de activate the termination Output The DMC 842 s word clock output is constantly active providing the current sample freque...

Страница 37: ...er it also has some disadvantages The word clock is based on a fraction of the really needed clock For example SPDIF 44 1 kHz word clock a simple square wave signal has to be multiplied by 256 inside...

Страница 38: ...rd clock delivering devices are designed as low impedance types but all word clock inputs as high impedance types in order to not weaken the signal on the chain But there are also negative examples wh...

Страница 39: ...User s Guide DMC 842 RME 39 User s Guide DMC 842 Technical Reference...

Страница 40: ...Level range 1 0 Vpp 5 6 Vpp Lock Range 27 kHz 200 kHz Jitter when synced to input signal 1 ns Jitter suppression 30 dB 2 4 kHz I64 MADI Card Coaxial via BNC 75 Ohm according to AES10 1991 High sensit...

Страница 41: ...Cable length coaxial up to 100 m Optical via FDDI duplex SC connector 62 5 125 and 50 125 compatible Cable length optical more than 500 m Generates 56 channel and 64 channel mode and 96k frame Single...

Страница 42: ...firmware I64 MADI Cards with the latest firmware have a sticker with the firmware version date code on them 20070217 The firmware of the I64 MADI Card can be updated in the factory Please contact the...

Страница 43: ...honix Signal In 1 2 In 1 2 In 3 4 In 3 4 In 5 6 In 5 6 In 7 8 In 7 8 D Sub 15 2 4 16 18 5 7 19 Signal Out 1 2 Out 1 2 Out 3 4 Out 3 4 Out 5 6 Out 5 6 Out 7 8 Out 7 8 D Sub 21 8 10 22 24 11 13 25 GND i...

Страница 44: ...a rate and hence twice the sample rate A stereo signal subsequently requires two AES EBU ports The Double Wire method is an industry standard today however it has a number of different names like Dual...

Страница 45: ...e rate is generated internally and thus slightly higher or lower than the DMC 842 s internal sample rate Result When reading out the data there will frequently be read er rors that cause clicks and dr...

Страница 46: ...g While the delays of digital interfaces can be disregarded altogether the analog inputs and out puts do cause a significant delay Modern converter chips operate with 64 or 128 times over sampling plu...

Страница 47: ...also work with double sample rate It was then possible to transmit two channels of 96 kHz data via one AES EBU port But Double Wire is still far from being dead On one hand there are still many devic...

Страница 48: ...rinciple because the audio information is stored in the same place in the data stream However there are blocks of additional information which are different for both standards In the table the meaning...

Страница 49: ...coaxial cables with 75 Ohms BNC plugs they are not expensive and easy to get The optical interface is much more interesting due to its complete galvanic separation but for many users it is a mystery b...

Страница 50: ...eadyClock has originally been de veloped to gain a stable and clean clock from the heavily jittery MADI data signal The embedded MADI clock suffers from about 80 ns jitter caused by the time resolutio...

Страница 51: ...User s Guide DMC 842 RME 51 20 Block Diagram...

Страница 52: ...h channel 40h Request microphone data input 1 41h Request microphone data input 2 42h Request microphone data input 3 43h Request microphone data input 4 44h Request microphone data input 5 45h Reques...

Страница 53: ...parameters AES42 commands are transmitted in groups of 4 Bytes nn1 nn2 oo1 oo2 Request Levelmeter Data Format F0 00 20 0D 42 Bank no dev ID 11 F7 This string triggers a shorter dump of only the level...

Страница 54: ...7 Gain x x 0 63 0 63dB 1dB steps 0Dh 13 Ch 7 settings x x see channel settings table 0Eh 14 Ch 8 Gain x x 0 63 0 63dB 1dB steps 0Fh 15 Ch 8 settings x x see channel settings table 10h 16 Setup 1 x x...

Страница 55: ...Hold 0 off 1 on LSB 0 Lock Keys 0 unlock 1 lock 12h Channel Lock Sync 1 MSB 7 0 6 reserved Request only 5 Input 2 RX AES42 0 Mode 1 1 Mode 2 Request only 4 Input 1 RX AES42 0 Mode 1 1 Mode 2 Request...

Страница 56: ...nc 0 no sync 1 sync Request only LSB 0 Input 7 Lock 0 unlock 1 lock 16h Host Lock Sync MSB 7 0 6 reserved Request only 5 WCK Sync 0 no sync 1 sync Request only 4 WCK Lock 0 unlock 1 lock Request only...

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