Dolby Laboratories DP570 - Manual (Page 34)

22 Dolby ® DP570 Multichannel Audio Tool User’s Manual
Controlling the DP570 Using the GPI/O Connector
3.6.2 Assigning GPI/O Functions to Specific Pins
The GPI/O port is a female 37‐pin D‐connector. See Figure 3‐7 to identify pin numbers.
Figure 3-7 GPI/O Pin Numbers
Table 3‐8 shows the pins that are available for GPO and GPI functions.
Program Select (1–8) Either Either Enabled Indicates which program is selected.
Preset Select (1–32) Either Either Enabled Indicates which preset is selected.
Downmix Mode
(Full, Stereo, Mono,
Phant, 3‐Stereo) Either Either Enabled Indicates which mode is selected.
Dynamic Range
Control Mode
(Line, RF, Custom) Either Either Enabled Indicates which compression mode is
selected.
Reference Level a Either Level 0 dB Indicates Master Volume = 0 dB.
a. Not available in units without the Cat. No. 548 Analog Option Card.
Table 3-8 GPI/O Pins Available
Pin Function Pin Function
1 +5 V (150 mA)
2 Fault output
Low polarity
Level‐triggered
Active state: Fault
20 Volume Control Shaft Encoder
A input
High polarity
Edge‐triggered
3 Error output
High polarity
Level‐triggered
Active state: Error
21 Volume Control Shaft Encoder
B input
High polarity
Edge‐triggered
4 User‐defined output 22 Volume Control Shaft Encoder
present input
Low polarity
Level‐triggered
Active state: Volume Control
Shaft Encoder present
5 Solo tally output a
High polarity
Level‐triggered
Active state: Enabled
23 User‐defined input
Table 3-7 GPI Functions Available
Function Polarity Trigger Active State Description
GP I/O
1 19
37 20