RS232 Protocol

ManualsBrandsRotel ManualsAudio EquipmentCD Player

Rotel RCD-1572

RS232 ASCII Controller Command List

The RCD-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.

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 V2.33, the RS232 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 RCD-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.

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 display update information can be enabled/disabled using the

“display_update_auto” and “display_update_manual” commands.

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

July 19, 2017

1.00

Original Specification

January 6, 2019

2.00

Add V2.0 specification and details on change

Summary of content (10 pages)

PAGE 1
Rotel RCD-1572 RS232 ASCII Controller Command List Date July 19, 2017 January 6, 2019 Version 1.00 2.00 Update Description Original Specification Add V2.0 specification and details on change The RCD-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. All commands sent to the attached Rotel device must have a terminating “!” character.
PAGE 2
Section 1: Control Command List V2.0 Applies to RCD-1572 V2.
PAGE 3
Section 2: Feedback Request Command List V2.0 Applies to RCD-1572 V2.
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
PAGE 5
Section 3: Control Command List V1.0 Applies to RCD-1572 prior to V2.
PAGE 6
RCD-1572 ASCII Command Description dimmer_2! Set Display to 2 dimmer_3! Set Display to 3 dimmer_4! Set Display to 4 dimmer_5! Set Display to 5 dimmer_6! Set Display to 6 (Dimmest) DISPLAY REFRESH COMMANDS display_update_auto! Set Display Update to Auto display_update_manual! Set Display Update to Manual Unit Response dimmer=2! dimmer=3! dimmer=4! dimmer=5! dimmer=6! display_update=auto! display_update=manual! Section 4: Feedback Request Command List V1.0 Applies to RCD-1572 prior to V2.
PAGE 7
Command: Description: Return String: Return Description: Example: Command: Description: Return String(s): Return Description: Example: get_display_size! Request display size display_size=##,##! Columns and rows on current display display_size=20,02! 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): Retu
PAGE 8
Section 5: Special Character Mapping Certain characters on the RCD-1572 display may be represented by a combination of 2 hex bytes in the feedback string provided by the unit. Refer to the chart below for a mapping of the different characters.
PAGE 9
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 10
Command V1.0 n/a n/a n/a get_current_dimmer! get_display! get_display1! get_display2! get_product_type! get_product_version! get_display_size! get_display_update! Command V2.0 rpt? time? disc_name? dimmer? n/a n/a n/a model? version? n/a n/a Response V1.0 n/a n/a n/a dimmer=#! display=###,text display1=###,text display2=###,text product_type=##,text product_version=##,text display_size=##,##! display_update=auto! 10 Response V2.