Installation manual

Dolby
®
Model CP650 Installation Manual
E-1
Appendix E
External Control of CP650
The CP650 can be controlled by devices connected to the RS-232 serial data
connector, or to the remotes connector located on the rear of the CP650.
This appendix is for use by customers who are highly qualified to modify hardware
and write software. Dolby Laboratories cannot be held liable for incidental, special,
direct, indirect, or consequential damages; or loss of use, revenue, or profit by users
attempting to interface the CP650 with other systems.
E.1 Control via RS-232 Serial Data Port
CP650 control via the serial data connector (the primary interface designed and
supported by Dolby) is available in CP650 system software version 1.2.1.1 and later.
The CP650 provides a SERIAL DATA port that supports standard 9-pin serial
connections to PC serial ports and other RS-232 devices. Although this port is
primarily used while running the Dolby
®
CP650 Setup software from a PC, the
software interface described below allows the serial data port to be used with a simple
ASCII character interface to set and get information regarding the current CP650
processor status.
The raw serial interface parser accepts ASCII commands as described below. Each
command consists of a simple keyword, <key>, followed by an “=” sign and the
<value> for that key. A command is terminated by an end-of-line character
combination (“\r\n”). This is the typical “end of line” combination sent by PC
terminal programs.
Current CP650 settings may be queried by substituting a question mark “?” for the
“<value>” field. The complete set of known settings may be queried by using the
special “all=?” command. See the examples below.