Dolby Laboratories S01/13621 - Manual (Page 22)

Dolby Installation Guidelines Unit Connections and Dimensions
2-12
2.6.5 Serial I/O (Remote)
Future versions of the DP571 will allow remote control via the front-panel (RS-232)
or rear-panel (RS-485) ports. See Section 6.4 for further information. The serial I/O
connections can also used for software upgrades.
2.6.6 General Purpose Input/Output (Status Port)
The input and output signals are 0–5 V TTL.
Table 2-7 Pin Connections of GPI/O Port
Pin Connection Comments
1 Preset Tally A Preset tally output
2 Reference Video Valid 1: Valid; 0: Ref video error
3 Dolby E Encoding Valid 1: Valid; 0: Encoding error
4 System Operational 1: Functional 0: Failed
5 Fault 1: Functional 0: Hardware Fault
6 Preset Tally B Preset tally output
7 Preset Ctrl A Preset control input
8 Preset Ctrl B Preset control input
9 Ground —
Pins 1 and 6 Presets 1–3 generate corresponding outputs on the status port that
can be used to indicate selection of a preset via the status port, serial
remote port (in future versions), or the front panel.
Table 2-8 Status Port Preset Selection
Preset Tally A (Pin 1) Preset Tally B (Pin 6) Preset
Low High 1
High Low 2
Low Low 3
High High Other or no preset
Pins 2-5 These indicate the current condition of the unit. A “1” corresponds to a
high level on the corresponding pin.
Pins 7-8 The two inputs on pins 7 and 8 select among the first three (of eight)
presets stored in the DP571. The inputs are normally high (internal pull-
up) and trigger a preset recall by sensing a momentary high-to-low
transition.