DIN Sync
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The SYNC standard defines an interface for electronic music instruments. It introduced in the 1980s by Roland Corporation for synchronization of music sequencers, drum machines, arpeggiators and similar devices. The SYNC standard uses the signals clock (or tempo) and start/stop (or run/stop). The signals are TTL compatible. This means the low state is 0 V, the high state is about +5 V. The clock signal defines the speed of the sequence or drum pattern. The start/stop signal defines if the sequence is running (start/stop = 0 V -> stop, start/stop = +5 V -> running). The SYNC standard uses 5 pin DIN connectors (same as used for MIDI but uses different pins) with the following socket pin-out:
In some applications the remaining pins (4 and 5) are even used as "tap", "fill in" or "reset and start". But this differs from device to device.
To connect two SYNC devices a cable with a 3 or 5 pin plug on each side has to be used. The pins 1, 2 and 3 have to be connected (in contrast to MIDI that uses the pins 4 and 5). A standard MIDI cable is not suitable as here the pins 1 and 3 may be unconnected !
SYNC Input/Output: Some SYNC devices have SYNC In and SYNC Out sockets Others have only one socket that can be switched between input and output (e.g. Roland TR-808). The third group uses switched sockets. This means that the socket is switched to input if a plug is inserted (e.g. Roland TB-303). If you want to use this socket as output a special plug without ring has to be used as the ring of the plug operates the switch. For details refer to the user's manual or service manual of the regarding device.
