MOTU Digital Timepiece User's Guide download pdf (Page 60)

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MIDI MACHINE CONTROL

from your MMC software or hardware controller.

The MMC controller sends play, stop, start and

cueing commands to the Digital Timepiece and all

other devices (including your computer software)

chase and lock to time code being generated by the

Digital Timepiece.

You should also try, if you can, to use either the

Digital Timepiece or house sync video as the time

base master, which provide a highly stable time

base with the fastest possible lock-up time.

Other MMC scenarios

In the recommended scenario described in the

previous section, the Digital Timepiece receives

MMC transport commands and serves as the

address (time code) master for everything else.

Alternately, you could choose another MMC

device to receive transport commands and serve as

the time code master. For example, the device

would receive transport commands from your

computer software and generate SMPTE time code

(LTC). In this case, you would set the Digital

Timepiece time base mode to LTC and feed the

LTC into the Digital Timepiece, which would then

drive all other devices.

There is no advantage to doing MMC this way; in

fact, it will probably not provide as stable a time

base as the Digital Timepiece does in the

recommended scenario described in the previous

section. You should only really use this setup if you

have a MMC device that does not have the ability to

be a time code slave and therefore must be the

master.

MMC and video

If you are working with video, and you want MMC

control of your rig from your computer software or

hardware controller via the Digital Timepiece, your

video deck needs to support one of the following:

■ SONY 9-pin machine control

■ MIDI Machine control

■ SMPTE time code (as a time code slave)

Without one of these capabilities, your video deck

cannot be a slave to the Digital Timepiece because

the Digital Timepiece would have no way to control

its transports. If your video deck doesn’t have one

of the above capabilities, you’ll have to use your

video deck as the transport and address master.

MMC DEVICE IDs

According to the MMC (MIDI Machine Control)

speciﬁcation, each MMC device must have a

unique MMC ID (identiﬁcation) to facilitate

communication among several devices. For your

convenience, the Digital Timepiece has the ability

to set MMC device IDs automatically — although

there are a few exceptions, as well as some

additional considerations you should know as

discussed in the following sections.

The Digital Timepiece MMC ID

The factory default MMC device ID of the Digital

Timepiece is one (in a one-based numbering

scheme of 1-128). When you set up an MMC

hardware controller, or your MMC-compatible

computer software, as a transport master over the

Digital Timepiece, just make sure that it knows that

the Digital Timepiece’s ID is one (1) — unless your

controller has a zero-based numbering scheme

(0-127), in which case you should set it to zero (0).

Zero-based numbering schemes

As mentioned above, some MMC devices think

that the range of MMC device IDs goes from 0-127;

others think the range is 1-128. ADATs and the

Digital Timepiece use the one-based scheme.

DA-88s use the 0-127 scheme. Regardless of the

scheme your MMC controller uses, you can be sure

that it will successfully communicate with the

Digital Timepiece if you use the factory default ID

of the Digital Timepiece (1) and if you identify the

Digital Timepiece in your MMC controller as the

lowest ID possible (either 1 or 0).

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MOTU Digital Timepiece User's Guide Page 60

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