Harman Kardon SIG2.0 Owners Manual - Page 8

SIGNATURE BUS PROTOCOL MASTER DOCUMENT Revised 2-24-98 COMMAND: Preamble Target Byte Device Type 7Eh 20h Target Unit ID 01h ACKNOWLEDGMENT Source Device Type 30h Source Unit ID 01h Data Length Computed Command Modifier 01h Command Byte Command Data Byte(s) Data Checksum Byte See page 7 ACKNOWLEDGE: Preamble Target Byte Device Type 7Eh 30h Target Unit ID 01h Source Device Type 20h Source Unit ID 01h Data Length 02h Command Modifier 02h Command Byte See Below Data Byte(s) None Checksum Byte See page 7 The acknowledge Command Byte is formed by adding 80h to the received Command Byte. Example: HEX COMMAND DESCRIPTION 05 Command to Mute 85 Acknowledge The receiving unit transmits the "Acknowledge" response to let the sending unit know that the message has been successfully received. The Data Byte(s) are not included in the Acknowledge message. An Acknowledge is required after EVERY message sent, in either direction. Page 8 of 20