Display Messages - Russound CAS44 Manual

Byte #19 = Alignment (0x00 = Centered, 0x01 = Left justified)
Byte #20 = Low Byte of Flash Time
Byte #21 = High Byte of Flash Time
Byte #22 – #34 = ASCII text characters (Section 11 ASCII Character Set)

9 Display Messages

The following section describes how to read Display Messages. These include Direct Display
Feedback messages, Source Broadcast Display Feedback messages, and Multi-Field Broadcast
Display Feedback messages.
NOTE: In order to fully support the display capabilities, Direct Display feedback messages,
Source Broadcast Feedback messages and Multi-Field Broadcast Messages, should be
supported. (Multi-Field Broadcast messages are only used with XM.)
9.1 Reading Direct Display Feedback
This section describes how to read Direct Display Feedback Messages. These Feedback
messages are usually sent in direct response to a received command (e.g., If the current
frequency of a Russound tuner is "102.7 MHz FM", sending the "Frequency Up" command will
trigger the Tuner to send a Display message back to the sender to update the frequency Display
to "102.9 MHz FM"). The Direct Display Feedback message is sent directly to the Target
Device ID of the message sender. The message can be displayed for a constant amount of time,
or a "Flash" display with a specified length of time (Flash Time is in increments of 10ms).
NOTE: It is possible that some display messages will include the special "Invert" control
character (0xF1).
NOTE: Some of the other bytes within this message may vary. Only the ones necessary to
interpret the message are highlighted.
NOTE: This message shows a text payload of 16 characters. Some devices may have a text
payload of 12 characters.
This is what the Direct Display Feedback message would look like using the above example.
Byte # 1 2 3 4 5 6
Value F0 00 00 70 00 7D 00 00 02 01 01 02 01 01 00 00 01 00 14 00 01 00 00 31
Byte # 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
Value 30 32 2E 39 20 4D 48 7A 20 46 4D 00 00 00 00 00 7F F7
Byte #2 – #4 = Target Device ID (This message should be displayed if the target Device ID
matches the Device ID of your device.)
Byte #19 = Overall Payload Size
Byte #22 = Flash Time low byte (Flash time is in 10ms increments, 0x00 = Constant)
Byte #23 = Flash Time high byte
Byte #24 – #40 = Text ("102.9 MHz FM" used in above example)
Byte #41 = Calculated Checksum
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
33