RS232 Protocol

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Rotel CD11 / CD14

RS232 ASCII Controller Command List

The CD11 and CD14 support an ASCII based RS232 protocol. The RS232

hardware does not support flow control so care needs to be take when sending and

receiving data to avoid packet loss.

All commands sent to the attached Rotel device must have a terminating “!” character.

Example Command: power_on!

Note: Do not include any spaces in the command, and do not include a carriage return

or line feed after the command, only the “!” terminating character.

Status information from the attached Rotel product will have a terminating “$” character

for fixed length options. Variable-length strings (i.e. CD disc/track metadata) will be

terminated with a double character ‘$$’ instead. It is up to the sending/receiving control

application to properly parse and process the packets.

Connection Settings

Baud Rate

Parity

Valid Data Bits

Stop Bit Value

Handshaking

Data Type

57600

None

String

Communication Protocol

Command and response messages are included on the following pages.

Automatic status update information can be enabled/disabled using the

“rs232_update_on” and “rs232_update_off” commands.

With RS232 update set to ON, any status changes to the unit will be transmitted via

RS232. With RS232 update set to OFF, the unit will not send any feedback unless polled

by the controller.

Date

Version

Update Description

August 26, 2016

1.00

Original Specification

December 18, 2018

1.10

Add CD11

Summary of content (4 pages)

PAGE 1
Rotel CD11 / CD14 RS232 ASCII Controller Command List Date August 26, 2016 December 18, 2018 Version 1.00 1.10 Update Description Original Specification Add CD11 The CD11 and CD14 support an ASCII based RS232 protocol. The RS232 hardware does not support flow control so care needs to be take when sending and receiving data to avoid packet loss. All commands sent to the attached Rotel device must have a terminating “!” character.
PAGE 2
Section 1: Control Command List CD11/CD14 ASCII Command Description POWER COMMANDS power_on! Power On power_off! Power Off power_toggle! Power Toggle CD TRANSPORT COMMANDS play! Play stop! Stop pause! Pause Toggle trkf! Track Forward trkb! Track Backward ff! Fast Forward fb! Fast Backward rnd! Random Play Mode Toggle rpt! Repeat Play Mode Toggle NUMERIC KEY COMMANDS 1! Number Key 1 2! Number Key 2 3! Number Key 3 4! Number Key 4 5! Number Key 5 6! Number Key 6 7! Number Key 7 8! Number Key 8 9! Number Key 9
PAGE 3
Section 2: Feedback Request Command List Command: Description: Return String(s): Return Description: Example: power? Request current power status power=on$ / power=standby$ Current power status power=on$ Command: Description: Return String(s): Return Description: Example: status? Request CD play status status=play$ / status=stop$ / status=pause$ CD Play Status status=pause$ Command: Description: Return String(s): Return Description: Example: track? Request current CD track number track=###$ Current CD
PAGE 4
Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: time? Request current CD track time time=#:##:##$$ Text string of time, depending on which time display mode has been set (track time elapsed or remaining, disc time elapsed or remaining) time=0:02:45$$ / time=1:10:32$$ disc_name? Request current CD name disc_name=text$$ Current CD