Tascam DA-78HR - Manual (Page 47)

TASCAM DA-78HR
47
8 - Synchronization with other DTRS units
This section describes the techniques and methods to
be followed when the DA-78HR is linked to other
DTRS units (e.g. TASCAM DA-98, DA-38, DA-88
and of course other DA-78HR units).
Up to 16 DTRS units can be linked, for a total of 128
digital tracks.
If you are connecting DTRS units of different types
to the DA-78HR, use the DA-78HR or a DA-98 as
the master unit and the other units as slave units.
8.1 Synchronization connections
The cable to be used when connecting the DA-78HR
to other DTRS units for synchronization purposes
should be a PW-88S cable. This is 1 meter (3 ft.)
long. If you require a longer cable, please consult
your TASCAM dealer.
NOTE
S
Be sure to use only the optional PW-88S sync cables. The
use of any other cables could damage the DA-78HR.
Be sure to connect the ter mination plug to the last slave’s
SYNC OUT connector, or else incorrect functions may
occur.
Turn on all the DTRS units in your system, regardless of
whether you actually use all of them. A unit or units turned
off will make synchronization impossible.
To synchronize multiple DTRS units, use a pre-for matted
tape in the master unit, and also in the slave units. Since
the DTRS system uses ABS time to achieve synchroniza-
tion, it is impossible to synchronize using tapes without
ABS time recorded on them.
To synchronize multiple DTRS units, all the tapes in
each unit must be formatted at the same sampling
rate, or synchronization is impossible.
The synchronization connections form a “daisy-
chain”, with the master unit at the head of the chain,
and the last slave at the tail.
Connections are made from the SYNC OUT of one
unit to the REMOTE IN/SYNC IN of the next. This
connection also carries the word clock between the
DTRS units. Slave units will automatically take their
clock through this, as shown by the front panel
CLOCK indicators, neither of which will be lit.
There are exceptional circumstances when indepen-
dent clocks may be necessary. See 8.6, “Individual
clock mode” for details.
NOTE
Always make and break all connections with the
power to all units in the chain turned OFF.
8.2 Machine ID and master/slave
settings
Each DTRS unit in the chain must be assigned a
machine ID. The unit at the head of the chain (the
master) should have ID number 1.
Though not strictly necessary, we suggest that IDs
are assigned in a consecutive sequential order from
the head of the chain.
8.2.1 Differences between DTRS models
The DA-78HR, DA-98 and DA-38 use machine IDs
that are set by software (the machine must be turned
on for the ID to be set). The values for the IDs of
these models start at “1” and go up to “16”.
The switch on the back of the DA-88 is only opera-
tive when the unit is turned off. It is marked from “0”
through “F”.
When including DA-88s and DA-78HRs in the same
chain, add 1 to the number shown on the DA-88’s
rear panel machine ID switch to make the DA-88’s
machine ID match the series of the DA-78HR (and
DA-98 and DA-38) IDs. Any DA-88 whose Machine
ID is not 1 (the switch has been set to a value other
than 0) will show its Slave ID briefly at power-on.
Therefore, for a chain of three units; a DA-78HR as
master, with a DA-98 and DA-88 as slaves, the
machines’ IDs should be set as follows:
It therefore makes sense to set the machine IDs of all
DA-88s in the chain first, immediately after connec-
tions have been made with the power off, and then
turn on power to all units before setting the machine
IDs of all DA-78HRs, DA-98s and DA-38s in the
chain.
NOTE
When you set the machine IDs, you can set the ID of
any machine first, but we recommend doing this in a
Unit
ID
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How the ID is
set
P
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set
DA-78HR 1 1 Tape counter
menu system ON
DA-98 2 2 Menu system ON
DA-88 2 3 Rotary switch on
rear panel OFF