Pro Tools | SYNC HD Guide80
GPI Triggers
GPI output signals information:
0 (relay) = Play
1 (relay) = Record Ready
2 (relay) = fader start #1
3 (relay) = fader start #2
4 (TTL) = Stop
5 (TTL) = Record
Logical GPI numbers 0 through 3 are associated
with GPI relay outputs 0 through 3 (pins 3 through
10). GPI numbers 4 and 5 are associated with GPI
TTL outputs 0 and 1 (pins 1 and 2).
GPI TTL WIring
The circuit can drive approximately 2 mA through
a load of 1.6K and maintain a logic high level of
3.3V. In an application where the equipment being
controlled has more demanding power require-
ments, an external buffer or relay circuit mst be
used. This would typically be constructed as part
of a custom electrical interface.
Each GPI TTL output is fully short-circuit pro-
tected via a 220-ohm series resistor.
Before attempting to wire any type of
custom interface, always check the electrical
specifications provided by the equipment
manufacturer, including voltage levels,
current, loading and polarity. Incorrect
wiring may damage your equipment, the
SYNC HD, or cause personal injury.
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