BSS Audio OPAL Series DPR-522 Owner's Manual - Manual (Page 20)

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6.17 Key send
connector
This is a ‘pseudo balanced’ output and carries a buffered version of the signal
applied to the MAIN input. It may be used as such, or can be connected to
the input of external equipment for further processing. Refer to section 5.1 for
the wiring details of this connector.
6.18 Key return
connector
6.19 Control
connector
If the KEY EXT switch is depressed, this fully balanced socket is the input to
the DPR-522’s key side chain. It may be used as the return input from
equipment being driven from the DPR-522’s KEY SEND connector, of if
desired may be driven from another unrelated signal. Refer to section 5.4 for
the wiring details of this connector.
This is an 8 pin DIN socket that provides a means for externally controlling
the DPR-522 using switched or logic signals. The pins are assigned as follows:
1 GATE OPEN open collector output
2 GROUND
3 DISABLE HIGH input
4 PULLUP to +15V
5 EXTERNAL TRIGGER input
6 DISABLE LOW input
7 DISABLE PULLUP to +15V
8 GROUND
Control operations