Dolby Laboratories DP572 - Manual (Page 52)

Dolby E Multichannel Distribution System User Manual DP572 Dolby E Decoder
4-4
4.1.8 Status
General Purpose Input/Output (GPI/O) signals for the DP572 are available from the
Status port, a female DB-9 connector. The input and output signals are 0 – 5 V TTL.
Table 4-1 defines the pin configuration.
Table 4-1 DP572 Status Port Pin Functions
Using the Status Port to Select Voiceover and Switched Modes
The PCM Input channel routing can be changed via the Status port between Voiceover
and Switched Out modes, which are generally used when Dolby E is part of a distribution
system without a VTR (i.e., a network feed to an affiliate).
• Voiceover mode mixes the PCM input over the main program audio.
• Switched Out mode replaces the main program audio with the PCM input.
These modes can be controlled from the front panel, serial remote, or Status port. See
“Output Routing” on page 8. for a complete explanation of other PCM Chan Config
Output Routing modes not accessible to change via the Status port.
Pin Direction Connection Explanation
1 Output Dolby E Detect 1: Dolby E; 0: PCM or none
2 Output Reference Video Valid 1: Valid; 0: Ref video error
3 Output Dolby E Decoding Valid 1: Valid; 0: Decoding error
4 Output System Operational 1: Functional; 0: Failed
5 Output Fault 1: Functional; 0: Hardware fault
6 Output Reserved
7 Input PCM channel routing Voiceover and Switched mode
8 Input PCM channel routing Voiceover and Switched mode
9 N/A Ground