RS232 Protocol

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Rotel RDG-1520 / RT-09

RS232 ASCII Controller Command List

otel has released updated software for RDG-1520 and RT-09. The new software includes an

ASCII based RS232 protocol. The new protocol replaces the original HEX based communication

protocol. This new protocol is ASCII text based to make it easier for application programmers to

communicate with Rotel products.

The new protocol is effective starting with the Main software version V1.1.5.

The new protocol eliminates the Device ID and checksum requirements. 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 . Status

information from the attached Rotel product with either have a terminating “!” character or a

byte count for variable length text data that may include a “!” in the returned message. It is up

to the sending/receiving control application to properly parse and process the packets.

Note: The byte count only includes the text data and not the length or “,” character.

Note 2: Do not include a carriage return or line feed after the command, only the “!” terminating

character.

Connection Settings

Baud Rate

Parity

Valid Data Bits

Stop Bit Value

Handshaking

Data Type

115200

None

String

Communication Protocol

Command and response messages are included on the following pages. Automatic

display update information can be enabled/disabled using the “display_update_auto” and

“display_update_manual”.

In automatic mode each time the display changes the new display line(s) will be sent.

In manual mode the display updates must be requested each time a refresh of the display

information is desired.

Date

Version

Update Description

January 18, 2012

1.00

Original Specification

October 9, 2012

1.01

Added memory command

March 1, 2013

1.02

Added discrete opt/coax input & power status

commands. Requires Main Software V1.1.7

June 4, 2014

1.10

Added special character mapping

August 28, 2018

1.11

Add missing “!” char to recall preset commands.

Summary of content (6 pages)

PAGE 1
Rotel RDG-1520 / RT-09 RS232 ASCII Controller Command List Date January 18, 2012 October 9, 2012 Version 1.00 1.01 March 1, 2013 1.02 June 4, 2014 August 28, 2018 1.10 1.11 Update Description Original Specification Added memory command Added discrete opt/coax input & power status commands. Requires Main Software V1.1.7 Added special character mapping Add missing “!” char to recall preset commands. otel has released updated software for RDG-1520 and RT-09.
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Section 1: Control Command List RDG-1520 ASCII Command Description POWER & VOLUME COMMANDS power_on! Power On power_off! Power Off power_toggle! Power Toggle SOURCE SELECTION COMMANDS iradio! Source iRadio network! Source Network aux1_coax! Source Aux 1 Coax aux1_opt! Source Aux 1 Optical fm! Source FM dab! Source DAB usb! Source USB aux1! Source Aux 1 Coax/Opt Toggle SOURCE CONTROL COMMANDS play! Play Source stop! Stop Source pause! Pause Source track_fwd! Track Forward / Tune Up track_back! Track Backwa
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RDG-1520 ASCII Command Description 8! Number Key 8 9! Number Key 9 0! Number Key 0 10_plus! Number Key 10+ FM / DAB / IRADIO PRESET COMMANDS memory! Select memory for saving presets call_iradio_preset_n! Recall iRadio Preset n (n = 01 - 30) call_fm_preset_n! Recall FM Preset n (n = 01 - 30) call_dab_preset_n! Recall DAB Preset n (n = 01 - 30) DISPLAY REFRESH COMMANDS display_update_auto! Set Display Update to Auto display_update_manual! Set Display Update to Manual Unit Response n/a n/a n/a n/a n/a iradio
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Command: Description: Return String: Return Description: Example: Command: Description: Return String: Return Description: Example: Command: Description: Return String: Return Description: Example: Command: Description: Return String: Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: get_display4! Request display line #4 to
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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: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: get_current_preset! Request
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Command: Description: Return String(s): Return Description: Example: get_play_status! Request play status play_status=play! / play_status=stop! / play_status=pause! Source play status play_status=play! Section 3: Special Character Mapping Certain characters on the RDG-1520 display may be represented by a combination of 2-3 hex bytes in the feedback string provided by the unit. Refer to the chart below for a mapping of the different characters.