RS232 Protocol

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Rotel RCX-1500

RS232 ASCII Controller Command List

Rotel has released updated software for RCX-1500. 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

December 26, 2013

1.10

Added dimmer + CD player scan commands

June 4, 2014

1.20

Added special character mapping

August 28, 2018

1.21

Add missing “!” char to recall preset commands.

Summary of content (7 pages)

PAGE 1
Rotel RCX-1500 RS232 ASCII Controller Command List Date January 18, 2012 October 9, 2012 Version 1.00 1.01 March 1, 2013 1.02 December 26, 2013 June 4, 2014 August 28, 2018 1.10 1.20 1.21 Update Description Original Specification Added memory command Added discrete opt/coax input & power status commands. Requires Main Software V1.1.7 Added dimmer + CD player scan commands Added special character mapping Add missing “!” char to recall preset commands. Rotel has released updated software for RCX-1500.
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Section 1: Control Command List RCX-1500 ASCII Command Description POWER & VOLUME COMMANDS power_on! Power On power_off! Power Off power_toggle! Power Toggle volume_up! Volume Up volume_down! Volume Down volume_max! Set Volume to Max volume_min! Set Volume to Min volume_n! Set Volume to level n (n = 1 - 86) mute! Mute Toggle mute_on! Mute On mute_off! Mute Off SOURCE SELECTION COMMANDS cd! Source CD iradio! Source iRadio network! Source Network aux1_coax! Source Aux 1 Coax aux1_opt! Source Aux 1 Optical aux
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RCX-1500 ASCII Command Description Cursor Right Enter Key Long Press for Enter Key right! enter! enter_long! 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 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_pr
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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: Return Description: Example: get_display2! Request display line #2 to be sent display2=##,text Current display line 2, must include 2 digit length of text string at beginning followed by "," and text string (no
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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_power! Request c
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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_dab_preset_n! Request sa
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Command: Description: Return String(s): Return Description: Example: get_volume_min! Request Min volume value volume_min=0! volume min level volume_min=0! Section 3: Special Character Mapping Certain characters on the RCX-1500 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.