RS232 Protocol

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Rotel RSP-1572

RS232 HEX Protocol

The RS232 protocol structure for the RSP-1572 is detailed below. This is a HEX

based communication protocol.

Connection Settings

Baud Rate Parity Valid Data Bits Stop Bit Value

Handshaking Data Type

115200 N 8 1 None String

All commands sent to the attached Rotel device must follow the command

structure detailed below, unless specified otherwise. Send only the bytes only, no

spaces, delimeter, etc.

Standard Command String Format

Start Count Device ID Type Key Checksum

0xFE 0x03 0xA5 0x10 0xXX 0xXX

Note: The count byte only includes the ID, Type, and Key bytes; it does not include the

Start or Checksum bytes.

Note 2: Do not include any carriage returns or line feeds after the commands

Communication Protocol

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

standard response string of the unit mirrors the data that would be available on the front

panel of the unit.

Any change to the status of the front display on the unit will prompt a feedback string

mirroring that change.

Note that the spaces shown between hex bytes below are for clarity only; do not include

spaces in the actual command sent to the unit.

Date Version Update Description

February 3, 2012 1.00 Original Specification

August 12, 2014 1.01 Corrected an error with the Max volume command

Summary of content (12 pages)

PAGE 1
Rotel RSP-1572 RS232 HEX Protocol Date February 3, 2012 August 12, 2014 Version 1.00 1.01 Update Description Original Specification Corrected an error with the Max volume command The RS232 protocol structure for the RSP-1572 is detailed below. This is a HEX based communication protocol.
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Meta Encoding The start byte for all command and response strings is FE. To keep the device from encountering the start byte FE in any position other than as the start byte, any occurrence of the byes FD or FE in a command string must be converted to either FD 00 (for FD), or FD 01 (for FE). This will allow the string to pass while masking any occurrence of the byte FE except as the start byte. Commands that have Meta Encoding applied will be highlighted in red.
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Table 1 - Type 10 Primary Commands RSP-1572 HEX Command Description POWER & VOLUME COMMANDS FE 03 A5 10 0A C2 Power Toggle FE 03 A5 10 4A 02 Power Off FE 03 A5 10 4B 03 Power On FE 03 A5 10 0B C3 Volume Up FE 03 A5 10 0C C4 Volume Down FE 03 A5 10 1E D6 Mute Toggle FE 03 A5 10 71 29 Power Off All Zones SOURCE SELECTION COMMANDS FE 03 A5 10 02 BA Source CD FE 03 A5 10 03 BB Source Tuner FE 03 A5 10 05 BD Source Video 1 FE 03 A5 10 06 BE Source Video 2 FE 03 A5 10 07 BF Source Video 3 FE 03 A5 10 08 C0 Source
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RSP-1572 HEX Command Description FE 03 A5 10 62 1A PLII Panorama Toggle FE 03 A5 10 63 1B PLII Dimension Up FE 03 A5 10 64 1C PLII Dimension Down FE 03 A5 10 65 1D PLII Center Width Up FE 03 A5 10 66 1E PLII Center Width Down FE 03 A5 10 68 20 Dolby Digital EX Toggle FE 03 A5 10 22 DA Next Surround Mode OSD MENU COMMANDS FE 03 A5 10 18 D0 OSD Menu FE 03 A5 10 19 D1 Enter FE 03 A5 10 90 48 Exit FE 03 A5 10 1A D2 Cursor Right – Key Pressed FE 03 A5 11 1A D3 Cursor Right – Key Released FE 03 A5 10 1B D3 Cursor
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RSP-1572 HEX FE 03 A5 11 8B 44 FE 03 A5 10 8F 47 FE 03 A5 10 8C 44 OTHER COMMANDS FE 03 A5 10 17 CF FE 03 A5 10 16 CE FE 03 A5 10 1F D7 FE 03 A5 10 23 DB FE 03 A5 10 4C 04 FE 03 A5 10 4D 05 FE 03 A5 10 4E 06 FE 03 A5 10 4F 07 FE 03 A5 10 52 0A FE 03 A5 10 FF B7 FE 03 A5 10 6E 26 FE 03 A5 10 75 2D FE 03 A5 10 78 30 FE 03 A5 10 79 31 FE 03 A5 10 67 1F FE 03 A5 10 91 49 FE 03 A5 10 A1 59 FE 03 A5 10 93 4B Command Description Scan Back – Key Released Shuffle Repeat Record Function Select Dynamic Range Digital
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RSP-1572 HEX FE 03 A5 14 05 C1 FE 03 A5 14 06 C2 FE 03 A5 14 07 C3 FE 03 A5 14 08 C4 FE 03 A5 14 09 C5 FE 03 A5 14 94 50 FE 03 A5 14 8E 4A FE 03 A5 14 15 D1 Command Description Main Zone Source Video 1 Main Zone Source Video 2 Main Zone Source Video 3 Main Zone Source Video 4 Main Zone Source Video 5 Main Zone Source Video 6 Main Zone Source iPod/USB Main Zone Source Multi Input Table 3 - Type 15 Record Source Commands RSP-1572 HEX Command Description RECORD SOURCE SELECTION COMMANDS FE 03 A5 15 02 BF Rec
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RSP-1572 HEX Command Description FE 03 A5 16 08 C6 Zone 2 Source Video 4 FE 03 A5 16 09 C7 Zone 2 Source Video 5 FE 03 A5 16 94 52 Zone 2 Source Video 6 FE 03 A5 16 8E 4C Zone 2 Source iPod/USB FE 03 A5 16 6B 29 Zone 2 Follow Main Zone Source ZONE 2 OTHER COMMANDS FE 03 A5 16 6E 2C Party Mode Toggle Table 5 - Type 17 Zone 3 Commands RSP-1572 HEX Command Description ZONE 3 POWER & VOLUME COMMANDS FE 03 A5 17 0A C9 Zone 3 Power Toggle FE 03 A5 17 4A 09 Zone 3 Power Off FE 03 A5 17 4B 0A Zone 3 Power On FE 03
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RSP-1572 HEX Command Description FE 03 A5 18 01 C1 Zone 4 Volume Down FE 03 A5 18 1E DE Zone 4 Mute Toggle FE 03 A5 18 6C 2C Zone 4 Mute On FE 03 A5 18 6D 2D Zone 4 Mute Off FE 03 A5 18 71 31 Power Off All Zones ZONE 4 SOURCE SELECTION COMMANDS FE 03 A5 18 02 C2 Zone 4 Source CD FE 03 A5 18 03 C3 Zone 4 Source Tuner FE 03 A5 18 05 C5 Zone 4 Source Video 1 FE 03 A5 18 06 C6 Zone 4 Source Video 2 FE 03 A5 18 07 C7 Zone 4 Source Video 3 FE 03 A5 18 08 C8 Zone 4 Source Video 4 FE 03 A5 18 09 C9 Zone 4 Source Vi
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Table 8 - Type 32 Zone 2 Volume Direct Commands RSP-1572 HEX ZONE 2 VOLUME DIRECT COMMANDS FE 03 A5 32 00 DA Zone 2 Volume Min FE 03 A5 32 01 DB Zone 2 Volume 1 FE 03 A5 32 02 DC Zone 2 Volume 2 FE 03 A5 32 03 DD Zone 2 Volume 3 FE 03 A5 32 04 DE Zone 2 Volume 4 FE 03 A5 32 05 DF Zone 2 Volume 5 FE 03 A5 32 06 E0 Zone 2 Volume 6 FE 03 A5 32 10 EA Zone 2 Volume 16 FE 03 A5 32 24 FD 01 Zone 2 Volume 36 FE 03 A5 32 30 0A Zone 2 Volume 48 FE 03 A5 32 40 1A Zone 2 Volume 64 FE 03 A5 32 50 2A Zone 2 Volume 80 FE
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RSP-1572 HEX FE 03 A5 34 03 DF FE 03 A5 34 04 E0 FE 03 A5 34 05 E1 FE 03 A5 34 06 E2 FE 03 A5 34 10 EC FE 03 A5 34 22 FD 01 FE 03 A5 34 30 0C FE 03 A5 34 40 1C FE 03 A5 34 50 2C FE 03 A5 34 5F 3B FE 03 A5 34 64 40 Command Description Zone 4 Volume 3 Zone 4 Volume 4 Zone 4 Volume 5 Zone 4 Volume 6 Zone 4 Volume 16 Zone 4 Volume 34 Zone 4 Volume 48 Zone 4 Volume 64 Zone 4 Volume 80 Zone 4 Volume 95 Zone 4 Volume Max Table 11 - Type 40 12V Trigger Direct Commands RSP-1572 HEX Command Description 12V TRIGGER
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Section 2: Feedback String Format Standard Response String Format Start 0xFE Count 0x31 ID 0xA5 Type 0x20 Char1 Data Char42 Flag1 … … Flag5 Checksum 0xXX The feedback string is a representation of the display of the unit. The Char1 - Char42 data bytes contain ASCII data representing the text that appears across the 2 lines of the front display. It can contain source input, volume, and surround mode data and should be parsed to obtain this information.
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Smart Display Data String 1 Format Start 0xFE Count 0x1E ID 0xA5 Type 0x22 0x00 0x00 Data (28 Bytes) Line1(1) … Line1(26) Checksum 0xXX Smart Display Data String 2 Format Start 0xFE Count 0xEC ID 0xA5 Type 0x23 Line2(1) … Data (234 Bytes) Line2(26) Line3(1) … Line3(26) Line4(1) … Data Line4(26) Line5(1) … Line5(26) Line6(1) … Data Line6(26) Line7(1) … Line7(26) Line8(1) … Data Line8(26) Line9(1) … Line9(26) Line10(26) Checksum 0xXX Data … Line10(1) When the iPod/USB inp