Dolby Laboratories DP524 Dokumentacja Pobierz pdf (Strona 32)

6-5

6.3 Serial Control

It is possible to command the DP524 via the RS-232 port, J105 on the rear of the

unit when the Command/Aux data switch (S101-4) is in the Up position. The

communications protocol for command mode is fixed at 9600 baud, 1 stop bit, no

parity.

Note

This port cannot be used simultaneously for external control and Auxiliary Data output.

The unit expects to receive a five byte sequence and responds in one of the

following ways:

x If the command sequence is not expecting to return a value (as in the case

of Enable Test Tone) then successful receipt of the command is responded

with a single ASCII character '*'.

x If the command sequence is not received correctly (for example the stop

byte $FD is corrupted) then the unit responds with a single ASCII character

'?'.

x If the command is expecting a reply (as in the case of Return Status) then

that status byte is returned.

The data sequence is as follows ($ prefix denotes hexadecimal notation):

6.3.1 System related commands

The following commands are system commands and will be responded to

regardless of the algorithm currently loaded.

Command $14: Enable/Disable Test Tone

$FB $20 $14 data $FD

Where data is as follows:

B7 B6 B5 B4 B3 B2 B1 B0

Enable0 0 0SR2SR10 0

Enable, SR2 and SR1 are defined as follows:

SR1 SR2 Enable Comment

X X 0 Test Tone Disabled

0 0 1 48kHz Sample Rate, 1125Hz Tone

1 0 1 44.1Khz Sample Rate, 1033Hz Tone

0 1 1 32kHz Sample Rate, 750Hz Tone

1 1 1 Illegal

Note:

This command will only be accepted if the DIP switch controlling the Test Tone

(S101-1) is set for normal operation. If S101-1 is set active, this command will

respond with a '?' instead of '*'.

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Dolby Laboratories DP524 Dokumentacja Strona 32