RS232 Protocol

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Rotel RC-1572

RS232 / IP ASCII Controller Command List

The RC-1572 supports 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. The unit will also support IP control using the same command formats.

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 with either have a terminating “!” or

“$” character, depending on the protocol revision (see update below), 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.

Important Protocol Revision

As of software V2.65, the RS232 and IP protocol was updated with changes to some

commands as well as all feedback strings. This change will impact existing control

systems so any connected control systems should be updated to utilize the new protocol

before updating the software in the RC-1572.

The current commands and feedback strings are documented in Sections 1 & 2, while

the legacy commands for older software is documented in Sections 3 & 4. A summary

and list of specific changes is also provided in Appendix A.

The RS232 connection settings and IP control port remain unchanged with the 2.0

specification.

Connection Settings

Baud Rate

Parity

Valid Data Bits

Stop Bit Value

Handshaking

Data Type

115200

None

String

Date

Version

Update Description

August 27, 2018

1.00

Original Specification

January 6, 2019

2.00

Add V2.0 specification and details on change

Summary of content (14 pages)

PAGE 1
Rotel RC-1572 RS232 / IP ASCII Controller Command List Date August 27, 2018 January 6, 2019 Version 1.00 2.00 Update Description Original Specification Add V2.0 specification and details on change The RC-1572 supports 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. The unit will also support IP control using the same command formats.
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IP Control Settings The RC-1572 will only accept and respond to IP control commands if the product is connected to a local network and has a valid IP address. Commands will be accepted via TCP port 9590, and the unit will send responses back via the same port. The command and response format is identical to the serial commands. Communication Protocol Command and response messages are included on the following pages.
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RC-1572 ASCII Command Description SOURCE CONTROL COMMANDS play! Play Source stop! Stop Source pause! Pause Source trkf! Track Forward/Tune Up trkb! Track Backward/Tune Down TONE CONTROL COMMANDS bypass_on! Tone Bypass On bypass_off! Tone Bypass Off bass_up! Bass Up bass_down! Bass Down bass_-10! Set Bass to -10 bass_000! Set Bass to 0 bass_+10! Set Bass to +10 treble_up! Treble Up treble_down! Treble Down treble_-10! Set Treble to -10 treble_000! Set Treble to 0 treble_+10! Set Treble to +10 BALANCE CONTROL
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Section 2: Feedback Request Command List V2.0 Applies to RC-1572 V2.
PAGE 5
Command: Description: Return String(s): Return Description: Example: treble? Request current treble level treble=###$ (+01-10, -01-10, 000) Current tone control treble level treble=-01$ Command: Description: Return String(s): Return Description: Example: balance? Request current balance setting balance=###$ (L01-15, R01-15, 000) Current balance setting balance=L03$ Command: Description: Return String(s): Return Description: Example: Command: Description: Return String(s): Return Description: Example: Co
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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: ip? Request the IP address of the product ipaddress=###.###.###.###$ Current IP address ipaddress =192.168.100.
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Section 3: Control Command List V1.0 Applies to RC-1572 prior to V2.
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RC-1572 ASCII Command Description TONE CONTROL COMMANDS tone_on! Tone Controls On tone_off! Tone Controls Off bass_up! Bass Up bass_down! Bass Down bass_-10! Set Bass to -10 bass_000! Set Bass to 0 bass_+10! Set Bass to +10 treble_up! Treble Up treble_down! Treble Down treble_-10! Set Treble to -10 treble_000! Set Treble to 0 treble_+10! Set Treble to +10 BALANCE CONTROL COMMANDS balance_right! Balance Right balance_left! Balance Left balance_L15! Set Balance to Max Left balance_000! Set Balance to 0 balanc
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Section 4: Feedback Request Command List V1.0 Applies to RC-1572 prior to V2.
PAGE 10
Command: Description: Return String(s): Return Description: Example: get_display_update! Request display update display_update=auto! / display_update=manual! Status of if the display refresh is automatic or manual display_update=auto! Command: Description: get_current_power! Request current power status Return String(s): Return Description: Example: power=on! / power=standby! Current power status power=on! Command: Description: get_current_source! Return Description: Example: Request current source
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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): get_pcusb_class! Request current PC-USB class pcusb_class=1! / pcusb_class=2! Current PC-USB class pcusb_class=1! get_current_freq! Request current frequency for digital source input freq=off! /
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Command: Description: Return String(s): Return Description: Example: get_current_dimmer! Request current dimmer level dimmer=#! (0 - 6) Current display dimmer level. 0 = brightest, 6 = dimmest dimmer=3! Command: Description: Return String(s): Return Description: Example: get_power_mode! Request current power mode.
PAGE 13
Appendix A: Summary of Changes V1.0 – V2.0 A list of the specific changed commands and feedback strings between the V1.0 and V2.0 specification is detailed here. Global Changes In addition to the specific changes below, the terminating character on all feedback strings has changed to the “$” character instead of the previous “!” character. An example response string is provided below. Unit Response V1.0 bypass=off! Unit Response V2.0 bypass=off$ Control Command Changes Command V1.
PAGE 14
Feedback Request Command Changes Note the listed responses below may not include all values – refer to the appropriate command in the main documentation sections for the full list of potential response values. Command V1.